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musl/Makefile

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initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
#
# Makefile for musl (requires GNU make)
#
# This is how simple every makefile should be...
# No, I take that back - actually most should be less than half this size.
#
# Use config.mak to override any of the following variables.
# Do not make changes here.
#
exec_prefix = /usr/local
bindir = $(exec_prefix)/bin
prefix = /usr/local/musl
includedir = $(prefix)/include
libdir = $(prefix)/lib
cleanup shared library build system to be more $HOME-local-install friendly the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-28 09:38:11 +08:00
syslibdir = /lib
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
Makefile: make it possible to build arch specific C files
2013-02-06 09:11:49 +08:00
SRCS = $(sort $(wildcard src/*/*.c arch/$(ARCH)/src/*.c))
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
OBJS = $(SRCS:.c=.o)
LOBJS = $(OBJS:.o=.lo)
GENH = include/bits/alltypes.h
add infrastructure to record and report the version of libc.so this is still experimental and subject to change. for git checkouts, an attempt is made to record the exact revision to aid in bug reports and debugging. no version information is recorded in the static libc.a or binaries it's linked into.
2013-12-02 06:27:25 +08:00
GENH_INT = src/internal/version.h
make all .o files depend on *_impl.h and libc.h hopefully the annoyance of this will be minimal. these files all define internal interfaces which can change at any time; if different modules are using different versions of the interfaces, the library will badly break. ideally we would scan and add the dependency only for C files that actually reference the affected interfaces, but for now, err on the side of caution and force a rebuild of everything if any of them have changed. this commit is in preparation for the upcoming ssp overhaul commit, which will change internals of the pthread struct.
2012-05-04 08:35:11 +08:00
IMPH = src/internal/stdio_impl.h src/internal/pthread_impl.h src/internal/libc.h
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
LDFLAGS =
abstract out compiler runtime library for linking libc.so this allows config.mak to override the default -lgcc for building with other compilers such as pcc/clang/etc.
2012-08-03 09:05:43 +08:00
LIBCC = -lgcc
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
CPPFLAGS =
CFLAGS = -Os -pipe
CFLAGS_C99FSE = -std=c99 -ffreestanding -nostdinc
CFLAGS_ALL = $(CFLAGS_C99FSE)
changes to kernel sigaction struct handling in preparation for mips port
2012-07-11 14:44:14 +08:00
CFLAGS_ALL += -D_XOPEN_SOURCE=700 -I./arch/$(ARCH) -I./src/internal -I./include
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
CFLAGS_ALL += $(CPPFLAGS) $(CFLAGS)
CFLAGS_ALL_STATIC = $(CFLAGS_ALL)
remove forced -O3 from shared library CFLAGS I originally added -O3 for shared libraries to counteract very bad behavior by GCC when building PIC code: it insists on reloading the GOT register in static functions that need it, even if the address of the function is never leaked from the translation unit and all local callers of the function have already loaded the GOT register. this measurably degrades performance in a few key areas like malloc. the inlining done at -O3 avoids the issue, but that's really not a good reason for overriding the user's choice of optimization level.
2012-09-15 11:38:10 +08:00
CFLAGS_ALL_SHARED = $(CFLAGS_ALL) -fPIC -DSHARED
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
AR = $(CROSS_COMPILE)ar
RANLIB = $(CROSS_COMPILE)ranlib
replace system's install command with a shell script the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
2013-08-18 10:21:11 +08:00
INSTALL = ./tools/install.sh
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
fix Makefile so "make install" works before include/bits symlink exists previously, determination of the list of header files for installation depended on the include/bits symlink (to the arch-specific files) already having been created. in other words, running "make install" immediately after configure without first running "make" caused the bits headers not to be installed. the solution I have applied is to pull the list of headers directly from arch/$(ARCH)/bits rather than include/bits, and likewise to install directly from arch/$(ARCH)/bits rather than via the symlink. at this point, the only purpose served by keeping the symlink around is that it enables use of the in-tree headers and libs directly via -I and -L, which can be useful when testing against a new version of the library before installing it. on the other hand, removing the bits symlink would be beneficial if we ever want to support building multiple archs in the same source tree.
2013-07-02 01:43:43 +08:00
ARCH_INCLUDES = $(wildcard arch/$(ARCH)/bits/*.h)
ALL_INCLUDES = $(sort $(wildcard include/*.h include/*/*.h) $(GENH) $(ARCH_INCLUDES:arch/$(ARCH)/%=include/%))
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
various changes in preparation for dynamic linking support prefer using visibility=hidden for __libc internal data, rather than an accessor function, if the compiler has visibility. optimize with -O3 for PIC targets (shared library). without heavy inlining, reloading the GOT register in small functions kills performance. 20-30% size increase for a single libc.so is not a big deal, compared to comparaible size increase in every static binaries. use -Bsymbolic-functions, not -Bsymbolic. global variables are subject to COPY relocations, and thus binding their addresses in the library at link time will cause library functions to read the wrong (original) copies instead of the copies made in the main program's bss section. add entry point, _start, for dynamic linker.
2011-02-25 05:37:21 +08:00
EMPTY_LIB_NAMES = m rt pthread crypt util xnet resolv dl
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
EMPTY_LIBS = $(EMPTY_LIB_NAMES:%=lib/lib%.a)
add rcrt1 start file for fully static-linked PIE static-linked PIE files need startup code to relocate themselves, much like the dynamic linker does. rcrt1.c reuses the code in dlstart.c, stage 1 of the dynamic linker, which in turn reuses crt_arch.h, to achieve static PIE with no new code. only relative relocations are supported. existing toolchains that don't yet support static PIE directly can be repurposed by passing "-shared -Wl,-Bstatic -Wl,-Bsymbolic" instead of "-static -pie" and substituting rcrt1.o in place of crt1.o. all libraries being linked must be built as PIC/PIE; TEXTRELs are not supported at this time.
2015-05-26 15:37:41 +08:00
CRT_LIBS = lib/crt1.o lib/Scrt1.o lib/rcrt1.o lib/crti.o lib/crtn.o
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
STATIC_LIBS = lib/libc.a
cleanup shared library build system to be more $HOME-local-install friendly the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-28 09:38:11 +08:00
SHARED_LIBS = lib/libc.so
new gcc wrapper, entirely specfile based the _concept_ of this wrapper has been tested extensively, but the integration with the build/install system, and using a persistent specfile rather than one generated at build-time, have not been heavily tested and may need minor tweaks. this approach should be a lot more robust (and easier to improve) than writing a shell script that's responsible for trying to mimic gcc's logic about whether it's compiling or linking, building shared libs or executable files, etc. it's also lighter weight and should result in mildly faster builds when using the wrapper.
2012-04-23 02:32:49 +08:00
TOOL_LIBS = lib/musl-gcc.specs
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
ALL_LIBS = $(CRT_LIBS) $(STATIC_LIBS) $(SHARED_LIBS) $(EMPTY_LIBS) $(TOOL_LIBS)
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
ALL_TOOLS = tools/musl-gcc
build: overhaul wrapper script system for multiple wrapper support this overhauls part of the build system in order to support multiple toolchain wrapper scripts, as opposed to solely the musl-gcc wrapper as before. it thereby replaces --enable-gcc-wrapper with --enable-wrapper=..., which has the options 'auto' (the default, detect whether to use wrappers), 'all' (build and install all wrappers), 'no' (don't build any) and finally the options named after the individual compiler scripts (currently only 'gcc' is available) to build and install only that wrapper. the old --enable-gcc-wrapper is removed from --help, but still available. it also modifies the wrappers to use the C compiler specified to the build system as 'inner' compiler, when applicable. as wrapper detection works by probing this compiler, it may not work with any other.
2015-06-29 05:08:19 +08:00
WRAPCC_GCC = gcc
add musl-clang, a wrapper for system clang installs musl-clang allows the user to compile musl-powered programs using their already existent clang install, without the need of a special cross compiler. it achieves this by wrapping around both the system clang install and the linker and passing them special flags to re-target musl at runtime. it does only affect invocations done through the special musl-clang wrapper script, so that the user setup remains fully intact otherwise. the clang wrapper consists of the compiler frontend wrapper script, musl-clang, and the linker wrapper script, ld.musl-clang. musl-clang makes sure clang invokes ld.musl-clang to link objects; neither script needs to be in PATH for the wrapper to work.
2015-06-29 05:08:21 +08:00
WRAPCC_CLANG = clang
build: overhaul wrapper script system for multiple wrapper support this overhauls part of the build system in order to support multiple toolchain wrapper scripts, as opposed to solely the musl-gcc wrapper as before. it thereby replaces --enable-gcc-wrapper with --enable-wrapper=..., which has the options 'auto' (the default, detect whether to use wrappers), 'all' (build and install all wrappers), 'no' (don't build any) and finally the options named after the individual compiler scripts (currently only 'gcc' is available) to build and install only that wrapper. the old --enable-gcc-wrapper is removed from --help, but still available. it also modifies the wrappers to use the C compiler specified to the build system as 'inner' compiler, when applicable. as wrapper detection works by probing this compiler, it may not work with any other.
2015-06-29 05:08:19 +08:00
add build system support for arch endian & float abi variants
2013-07-19 08:30:58 +08:00
LDSO_PATHNAME = $(syslibdir)/ld-musl-$(ARCH)$(SUBARCH).so.1
cleanup shared library build system to be more $HOME-local-install friendly the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-28 09:38:11 +08:00
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
-include config.mak
fix a few bugs from last dynamic linking build system commit some cruft was left and DESTDIR was not being used correctly.
2011-06-28 20:27:38 +08:00
all: $(ALL_LIBS) $(ALL_TOOLS)
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
split up installation target patch by Luca Barbato (lu_zero)
2012-08-18 07:32:24 +08:00
install: install-libs install-headers install-tools
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
clean:
rm -f crt/*.o
rm -f $(OBJS)
rm -f $(LOBJS)
avoid deleting the lib/empty file
2011-02-18 06:57:26 +08:00
rm -f $(ALL_LIBS) lib/*.[ao] lib/*.so
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
rm -f $(ALL_TOOLS)
add infrastructure to record and report the version of libc.so this is still experimental and subject to change. for git checkouts, an attempt is made to record the exact revision to aid in bug reports and debugging. no version information is recorded in the static libc.a or binaries it's linked into.
2013-12-02 06:27:25 +08:00
rm -f $(GENH) $(GENH_INT)
preparing build system to handle ports - step 1
2011-02-15 13:33:23 +08:00
rm -f include/bits
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
distclean: clean
rm -f config.mak
preparing build system to handle ports - step 1
2011-02-15 13:33:23 +08:00
include/bits:
improve Makefile handling of git checkouts with missing lib/ and config.mak
2011-02-18 04:15:03 +08:00
@test "$(ARCH)" || { echo "Please set ARCH in config.mak before running make." ; exit 1 ; }
preparing build system to handle ports - step 1
2011-02-15 13:33:23 +08:00
ln -sf ../arch/$(ARCH)/bits $@
refactor headers, especially alltypes.h, and improve C++ ABI compat the arch-specific bits/alltypes.h.sh has been replaced with a generic alltypes.h.in and minimal arch-specific bits/alltypes.h.in. this commit is intended to have no functional changes except: - exposing additional symbols that POSIX allows but does not require - changing the C++ name mangling for some types - fixing the signedness of blksize_t on powerpc (POSIX requires signed) - fixing the limit macros for sig_atomic_t on x86_64 - making dev_t an unsigned type (ABI matching goal, and more logical) in addition, some types that were wrongly defined with long on 32-bit archs were changed to int, and vice versa; this change is non-functional except for the possibility of making pointer types mismatch, and only affects programs that were using them incorrectly, and only at build-time, not runtime. the following changes were made in the interest of moving non-arch-specific types out of the alltypes system and into the headers they're associated with, and also will tend to improve application compatibility: - netdb.h now includes netinet/in.h (for socklen_t and uint32_t) - netinet/in.h now includes sys/socket.h and inttypes.h - sys/resource.h now includes sys/time.h (for struct timeval) - sys/wait.h now includes signal.h (for siginfo_t) - langinfo.h now includes nl_types.h (for nl_item) for the types in stdint.h: - types which are of no interest to other headers were moved out of the alltypes system. - fast types for 8- and 64-bit are hard-coded (at least for now); only the 16- and 32-bit ones have reason to vary by arch. and the following types have been changed for C++ ABI purposes; - mbstate_t now has a struct tag, __mbstate_t - FILE's struct tag has been changed to _IO_FILE - DIR's struct tag has been changed to __dirstream - locale_t's struct tag has been changed to __locale_struct - pthread_t is defined as unsigned long in C++ mode only - fpos_t now has a struct tag, _G_fpos64_t - fsid_t's struct tag has been changed to __fsid_t - idtype_t has been made an enum type (also required by POSIX) - nl_catd has been changed from long to void * - siginfo_t's struct tag has been removed - sigset_t's has been given a struct tag, __sigset_t - stack_t has been given a struct tag, sigaltstack - suseconds_t has been changed to long on 32-bit archs - [u]intptr_t have been changed from long to int rank on 32-bit archs - dev_t has been made unsigned summary of tests that have been performed against these changes: - nsz's libc-test (diff -u before and after) - C++ ABI check symbol dump (diff -u before, after, glibc) - grepped for __NEED, made sure types needed are still in alltypes - built gcc 3.4.6
2013-07-22 23:22:36 +08:00
include/bits/alltypes.h.in: include/bits
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
refactor headers, especially alltypes.h, and improve C++ ABI compat the arch-specific bits/alltypes.h.sh has been replaced with a generic alltypes.h.in and minimal arch-specific bits/alltypes.h.in. this commit is intended to have no functional changes except: - exposing additional symbols that POSIX allows but does not require - changing the C++ name mangling for some types - fixing the signedness of blksize_t on powerpc (POSIX requires signed) - fixing the limit macros for sig_atomic_t on x86_64 - making dev_t an unsigned type (ABI matching goal, and more logical) in addition, some types that were wrongly defined with long on 32-bit archs were changed to int, and vice versa; this change is non-functional except for the possibility of making pointer types mismatch, and only affects programs that were using them incorrectly, and only at build-time, not runtime. the following changes were made in the interest of moving non-arch-specific types out of the alltypes system and into the headers they're associated with, and also will tend to improve application compatibility: - netdb.h now includes netinet/in.h (for socklen_t and uint32_t) - netinet/in.h now includes sys/socket.h and inttypes.h - sys/resource.h now includes sys/time.h (for struct timeval) - sys/wait.h now includes signal.h (for siginfo_t) - langinfo.h now includes nl_types.h (for nl_item) for the types in stdint.h: - types which are of no interest to other headers were moved out of the alltypes system. - fast types for 8- and 64-bit are hard-coded (at least for now); only the 16- and 32-bit ones have reason to vary by arch. and the following types have been changed for C++ ABI purposes; - mbstate_t now has a struct tag, __mbstate_t - FILE's struct tag has been changed to _IO_FILE - DIR's struct tag has been changed to __dirstream - locale_t's struct tag has been changed to __locale_struct - pthread_t is defined as unsigned long in C++ mode only - fpos_t now has a struct tag, _G_fpos64_t - fsid_t's struct tag has been changed to __fsid_t - idtype_t has been made an enum type (also required by POSIX) - nl_catd has been changed from long to void * - siginfo_t's struct tag has been removed - sigset_t's has been given a struct tag, __sigset_t - stack_t has been given a struct tag, sigaltstack - suseconds_t has been changed to long on 32-bit archs - [u]intptr_t have been changed from long to int rank on 32-bit archs - dev_t has been made unsigned summary of tests that have been performed against these changes: - nsz's libc-test (diff -u before and after) - C++ ABI check symbol dump (diff -u before, after, glibc) - grepped for __NEED, made sure types needed are still in alltypes - built gcc 3.4.6
2013-07-22 23:22:36 +08:00
include/bits/alltypes.h: include/bits/alltypes.h.in include/alltypes.h.in tools/mkalltypes.sed
sed -f tools/mkalltypes.sed include/bits/alltypes.h.in include/alltypes.h.in > $@
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
remove dependency of version.h on .git/* to avoid errors the wildcard function in GNU make includes dangling symlinks; if any exist under the .git directory, they would get added as dependencies, causing make to exit with an error due to lacking a rule to build the missing file. as far as I can tell, git operations which should force version.h to be rebuilt must all touch the mtime of the top-level .git directory.
2013-12-05 07:00:19 +08:00
src/internal/version.h: $(wildcard VERSION .git)
add infrastructure to record and report the version of libc.so this is still experimental and subject to change. for git checkouts, an attempt is made to record the exact revision to aid in bug reports and debugging. no version information is recorded in the static libc.a or binaries it's linked into.
2013-12-02 06:27:25 +08:00
printf '#define VERSION "%s"\n' "$$(sh tools/version.sh)" > $@
src/internal/version.lo: src/internal/version.h
add additional Makefile dependency rules for rcrt1.o PIE start file
2015-06-03 14:00:44 +08:00
crt/rcrt1.o src/ldso/dlstart.lo src/ldso/dynlink.lo: src/internal/dynlink.h arch/$(ARCH)/reloc.h
make dynlink.lo depend on reloc.h in makefile this is mainly a development convenience but will also ensure users building from latest git always get up-to-date arch-specific dynamic linker code without having to "make clean".
2012-08-06 00:32:20 +08:00
add additional Makefile dependency rules for rcrt1.o PIE start file
2015-06-03 14:00:44 +08:00
crt/crt1.o crt/Scrt1.o crt/rcrt1.o src/ldso/dlstart.lo: $(wildcard arch/$(ARCH)/crt_arch.h)
crt/rcrt1.o: src/ldso/dlstart.c
new mostly-C crt1 implementation the only immediate effect of this commit is enabling PIE support on some archs that did not previously have any Scrt1.s, since the existing asm files for crt1 override this C code. so some of the crt_arch.h files committed are only there for the sake of documenting what their archs "would do" if they used the new C-based crt1. the expectation is that new archs should use this new system rather than using heavy asm for crt1. aside from being easier and less error-prone, it also ensures that PIE support is available immediately (since Scrt1.o is generated from the same C source, using -fPIC) rather than having to be added as an afterthought in the porting process.
2013-07-26 13:49:14 +08:00
add rcrt1 start file for fully static-linked PIE static-linked PIE files need startup code to relocate themselves, much like the dynamic linker does. rcrt1.c reuses the code in dlstart.c, stage 1 of the dynamic linker, which in turn reuses crt_arch.h, to achieve static PIE with no new code. only relative relocations are supported. existing toolchains that don't yet support static PIE directly can be repurposed by passing "-shared -Wl,-Bstatic -Wl,-Bsymbolic" instead of "-static -pie" and substituting rcrt1.o in place of crt1.o. all libraries being linked must be built as PIC/PIE; TEXTRELs are not supported at this time.
2015-05-26 15:37:41 +08:00
crt/Scrt1.o crt/rcrt1.o: CFLAGS += -fPIC
new mostly-C crt1 implementation the only immediate effect of this commit is enabling PIE support on some archs that did not previously have any Scrt1.s, since the existing asm files for crt1 override this C code. so some of the crt_arch.h files committed are only there for the sake of documenting what their archs "would do" if they used the new C-based crt1. the expectation is that new archs should use this new system rather than using heavy asm for crt1. aside from being easier and less error-prone, it also ensures that PIE support is available immediately (since Scrt1.o is generated from the same C source, using -fPIC) rather than having to be added as an afterthought in the porting process.
2013-07-26 13:49:14 +08:00
enhance build process to allow selective -O3 optimization the motivation for this patch is that the vast majority of libc is code that does not benefit at all from optimizations, but that certain components like string/memory operations can be major performance bottlenecks. at the same time, the old -falign-*=1 options are removed, since they were only beneficial for avoiding bloat when global -O3 was used, and in that case, they may have prevented some of the performance gains. to be the most useful, this patch will need further tuning. in particular, research is needed to determine which components should be built with -O3 by default, and it may be desirable to remove the hard-coded -O3 and instead allow more customization of the optimization level used for selected modules.
2013-07-23 09:22:04 +08:00
OPTIMIZE_SRCS = $(wildcard $(OPTIMIZE_GLOBS:%=src/%))
$(OPTIMIZE_SRCS:%.c=%.o) $(OPTIMIZE_SRCS:%.c=%.lo): CFLAGS += -O3
work around gcc 4.8's generation of self-referential mem* functions at -O3
2013-08-02 05:12:23 +08:00
MEMOPS_SRCS = src/string/memcpy.c src/string/memmove.c src/string/memcmp.c src/string/memset.c
$(MEMOPS_SRCS:%.c=%.o) $(MEMOPS_SRCS:%.c=%.lo): CFLAGS += $(CFLAGS_MEMOPS)
allow libc itself to be built with stack protector enabled this was already essentially possible as a result of the previous commits changing the dynamic linker/thread pointer bootstrap process. this commit mainly adds build system infrastructure: configure no longer attempts to disable stack protector. instead it simply determines how so the makefile can disable stack protector for a few translation units used during early startup. stack protector is also disabled for memcpy and memset since compilers (incorrectly) generate calls to them on some archs to implement struct initialization and assignment, and such calls may creep into early initialization. no explicit attempt to enable stack protector is made by configure at this time; any stack protector option supported by the compiler can be passed to configure in CFLAGS, and if the compiler uses stack protector by default, this default is respected.
2015-04-14 08:13:10 +08:00
NOSSP_SRCS = $(wildcard crt/*.c) \
src/env/__libc_start_main.c src/env/__init_tls.c \
src/thread/__set_thread_area.c src/env/__stack_chk_fail.c \
src/string/memset.c src/string/memcpy.c \
src/ldso/dlstart.c src/ldso/dynlink.c
$(NOSSP_SRCS:%.c=%.o) $(NOSSP_SRCS:%.c=%.lo): CFLAGS += $(CFLAGS_NOSSP)
fix incorrect application of visibility to Scrt1.o commit de2b67f8d41e08caa56bf6540277f6561edb647f attempted to avoid having vis.h affect crt files, but the Makefile variable used, CRT_LIBS, refers to the final output copies in the lib directory, not the copies in the crt build directory, and thus the -DCRT was not applied. while unlikely to be noticed, this regression probably broke production of PIE executables whose main functions are not in the executable but rather a shared library.
2015-05-26 14:31:04 +08:00
$(CRT_LIBS:lib/%=crt/%): CFLAGS += -DCRT
add optional global visibility override this is implemented via the build system and does not affect source files. the idea is to use protected or hidden visibility to prevent the compiler from pessimizing function calls within a shared (or position-independent static) libc in the form of overhead setting up for a call through the PLT. the ld-time symbol binding via the -Bsymbolic-functions option already optimized out the PLT itself, but not the code in the caller needed to support a call through the PLT. on some archs this overhead can be substantial; on others it's trivial.
2015-04-20 10:05:29 +08:00
rework makefile subarch logic to allow shared files instead of subarchs getting their own .s files which are used directly by the makefile to replace the .c file, they now must provide a .sub file whose contents are a pathname, relative to the location of the .sub file, which will substitute for the .c file. essentially these files are acting as symbolic links, but implemented as text files.
2013-08-14 14:50:25 +08:00
# This incantation ensures that changes to any subarch asm files will
# force the corresponding object file to be rebuilt, even if the implicit
# rule below goes indirectly through a .sub file.
define mkasmdep
$(dir $(patsubst %/,%,$(dir $(1))))$(notdir $(1:.s=.o)): $(1)
endef
$(foreach s,$(wildcard src/*/$(ARCH)*/*.s),$(eval $(call mkasmdep,$(s))))
%.o: $(ARCH)$(ASMSUBARCH)/%.sub
$(CC) $(CFLAGS_ALL_STATIC) -c -o $@ $(dir $<)$(shell cat $<)
allow subarch-specific asm, including asm specific to the default the default subarch is the one whose full name is just the base arch name, with no suffixes. normally, either the asm in the default subarch is suitable for all subarch variants, or separate asm is mandatory for each variant. however, in the case of asm which is purely for optimization purposes, it's possible to have asm that only works (or only performs well) on the default subarch, and not any othe the other variants. thus, I have added a mechanism to give a name to the default variant, for example "armel" for the default, little-endian arm. further such default-subarch names can be added in the future as needed.
2013-08-11 15:27:35 +08:00
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
%.o: $(ARCH)/%.s
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
$(CC) $(CFLAGS_ALL_STATIC) -c -o $@ $<
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
make all .o files depend on *_impl.h and libc.h hopefully the annoyance of this will be minimal. these files all define internal interfaces which can change at any time; if different modules are using different versions of the interfaces, the library will badly break. ideally we would scan and add the dependency only for C files that actually reference the affected interfaces, but for now, err on the side of caution and force a rebuild of everything if any of them have changed. this commit is in preparation for the upcoming ssp overhaul commit, which will change internals of the pthread struct.
2012-05-04 08:35:11 +08:00
%.o: %.c $(GENH) $(IMPH)
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
$(CC) $(CFLAGS_ALL_STATIC) -c -o $@ $<
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
rework makefile subarch logic to allow shared files instead of subarchs getting their own .s files which are used directly by the makefile to replace the .c file, they now must provide a .sub file whose contents are a pathname, relative to the location of the .sub file, which will substitute for the .c file. essentially these files are acting as symbolic links, but implemented as text files.
2013-08-14 14:50:25 +08:00
%.lo: $(ARCH)$(ASMSUBARCH)/%.sub
$(CC) $(CFLAGS_ALL_SHARED) -c -o $@ $(dir $<)$(shell cat $<)
add subarch asm support for PIC objects/shared libc this rule was omitted in previous subarch asm commit
2013-08-11 15:49:16 +08:00
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
%.lo: $(ARCH)/%.s
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
$(CC) $(CFLAGS_ALL_SHARED) -c -o $@ $<
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
make all .o files depend on *_impl.h and libc.h hopefully the annoyance of this will be minimal. these files all define internal interfaces which can change at any time; if different modules are using different versions of the interfaces, the library will badly break. ideally we would scan and add the dependency only for C files that actually reference the affected interfaces, but for now, err on the side of caution and force a rebuild of everything if any of them have changed. this commit is in preparation for the upcoming ssp overhaul commit, which will change internals of the pthread struct.
2012-05-04 08:35:11 +08:00
%.lo: %.c $(GENH) $(IMPH)
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
$(CC) $(CFLAGS_ALL_SHARED) -c -o $@ $<
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
cleanup shared library build system to be more $HOME-local-install friendly the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-28 09:38:11 +08:00
lib/libc.so: $(LOBJS)
reorganize Makefile to support "least surprise" config/make semantics the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-02 07:30:03 +08:00
$(CC) $(CFLAGS_ALL_SHARED) $(LDFLAGS) -nostdlib -shared \
rename dynamic linker entry point from _start to _dlstart the main motivation for this change is to aid in debugging. since the main program's entry point is also named _start, it was difficult to set breakpoints or quickly identify which _start execution stopped in.
2014-06-20 12:25:12 +08:00
-Wl,-e,_dlstart -Wl,-Bsymbolic-functions \
remove soname from libc.so/ld-musl it serves no purpose (binaries linked against musl as -lc/libc.so automatically get the right DT_NEEDED value of libc.so) and causes ldconfig to misbehave (making a symlink to ld-musl named libc.so in /lib). ldconfig is not used on pure musl systems, but if ld-musl is installed on a system where it's not the primary libc, this will pollute the system /lib with a symlink to musl named libc.so, which should NOT exist and could cause problems linking native apps. also, the existence of the soname caused spurious warnings from ldconfig when /lib and /usr/lib were the same physical directory.
2013-03-10 11:34:11 +08:00
-o $@ $(LOBJS) $(LIBCC)
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
new solution for empty lib dir (old one had some problems)
2011-02-18 06:12:52 +08:00
lib/libc.a: $(OBJS)
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
rm -f $@
$(AR) rc $@ $(OBJS)
$(RANLIB) $@
new solution for empty lib dir (old one had some problems)
2011-02-18 06:12:52 +08:00
$(EMPTY_LIBS):
rm -f $@
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
$(AR) rc $@
new solution for empty lib dir (old one had some problems)
2011-02-18 06:12:52 +08:00
lib/%.o: crt/%.o
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
cp $< $@
new gcc wrapper, entirely specfile based the _concept_ of this wrapper has been tested extensively, but the integration with the build/install system, and using a persistent specfile rather than one generated at build-time, have not been heavily tested and may need minor tweaks. this approach should be a lot more robust (and easier to improve) than writing a shell script that's responsible for trying to mimic gcc's logic about whether it's compiling or linking, building shared libs or executable files, etc. it's also lighter weight and should result in mildly faster builds when using the wrapper.
2012-04-23 02:32:49 +08:00
lib/musl-gcc.specs: tools/musl-gcc.specs.sh config.mak
sh $< "$(includedir)" "$(libdir)" "$(LDSO_PATHNAME)" > $@
tools/musl-gcc: config.mak
build: overhaul wrapper script system for multiple wrapper support this overhauls part of the build system in order to support multiple toolchain wrapper scripts, as opposed to solely the musl-gcc wrapper as before. it thereby replaces --enable-gcc-wrapper with --enable-wrapper=..., which has the options 'auto' (the default, detect whether to use wrappers), 'all' (build and install all wrappers), 'no' (don't build any) and finally the options named after the individual compiler scripts (currently only 'gcc' is available) to build and install only that wrapper. the old --enable-gcc-wrapper is removed from --help, but still available. it also modifies the wrappers to use the C compiler specified to the build system as 'inner' compiler, when applicable. as wrapper detection works by probing this compiler, it may not work with any other.
2015-06-29 05:08:19 +08:00
printf '#!/bin/sh\nexec "$${REALGCC:-$(WRAPCC_GCC)}" "$$@" -specs "%s/musl-gcc.specs"\n' "$(libdir)" > $@
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
chmod +x $@
add musl-clang, a wrapper for system clang installs musl-clang allows the user to compile musl-powered programs using their already existent clang install, without the need of a special cross compiler. it achieves this by wrapping around both the system clang install and the linker and passing them special flags to re-target musl at runtime. it does only affect invocations done through the special musl-clang wrapper script, so that the user setup remains fully intact otherwise. the clang wrapper consists of the compiler frontend wrapper script, musl-clang, and the linker wrapper script, ld.musl-clang. musl-clang makes sure clang invokes ld.musl-clang to link objects; neither script needs to be in PATH for the wrapper to work.
2015-06-29 05:08:21 +08:00
tools/%-clang: tools/%-clang.in config.mak
sed -e 's!@CC@!$(WRAPCC_CLANG)!g' -e 's!@PREFIX@!$(prefix)!g' -e 's!@INCDIR@!$(includedir)!g' -e 's!@LIBDIR@!$(libdir)!g' -e 's!@LDSO@!$(LDSO_PATHNAME)!g' $< > $@
chmod +x $@
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
$(DESTDIR)$(bindir)/%: tools/%
replace system's install command with a shell script the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
2013-08-18 10:21:11 +08:00
$(INSTALL) -D $< $@
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
cleanup shared library build system to be more $HOME-local-install friendly the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-28 09:38:11 +08:00
$(DESTDIR)$(libdir)/%.so: lib/%.so
replace system's install command with a shell script the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
2013-08-18 10:21:11 +08:00
$(INSTALL) -D -m 755 $< $@
cleanup shared library build system to be more $HOME-local-install friendly the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-28 09:38:11 +08:00
adapt build/install/gcc-wrapper systems for dynamic linking support
2011-06-24 10:13:47 +08:00
$(DESTDIR)$(libdir)/%: lib/%
replace system's install command with a shell script the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
2013-08-18 10:21:11 +08:00
$(INSTALL) -D -m 644 $< $@
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
fix Makefile so "make install" works before include/bits symlink exists previously, determination of the list of header files for installation depended on the include/bits symlink (to the arch-specific files) already having been created. in other words, running "make install" immediately after configure without first running "make" caused the bits headers not to be installed. the solution I have applied is to pull the list of headers directly from arch/$(ARCH)/bits rather than include/bits, and likewise to install directly from arch/$(ARCH)/bits rather than via the symlink. at this point, the only purpose served by keeping the symlink around is that it enables use of the in-tree headers and libs directly via -I and -L, which can be useful when testing against a new version of the library before installing it. on the other hand, removing the bits symlink would be beneficial if we ever want to support building multiple archs in the same source tree.
2013-07-02 01:43:43 +08:00
$(DESTDIR)$(includedir)/bits/%: arch/$(ARCH)/bits/%
replace system's install command with a shell script the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
2013-08-18 10:21:11 +08:00
$(INSTALL) -D -m 644 $< $@
fix Makefile so "make install" works before include/bits symlink exists previously, determination of the list of header files for installation depended on the include/bits symlink (to the arch-specific files) already having been created. in other words, running "make install" immediately after configure without first running "make" caused the bits headers not to be installed. the solution I have applied is to pull the list of headers directly from arch/$(ARCH)/bits rather than include/bits, and likewise to install directly from arch/$(ARCH)/bits rather than via the symlink. at this point, the only purpose served by keeping the symlink around is that it enables use of the in-tree headers and libs directly via -I and -L, which can be useful when testing against a new version of the library before installing it. on the other hand, removing the bits symlink would be beneficial if we ever want to support building multiple archs in the same source tree.
2013-07-02 01:43:43 +08:00
adapt build/install/gcc-wrapper systems for dynamic linking support
2011-06-24 10:13:47 +08:00
$(DESTDIR)$(includedir)/%: include/%
replace system's install command with a shell script the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
2013-08-18 10:21:11 +08:00
$(INSTALL) -D -m 644 $< $@
adapt build/install/gcc-wrapper systems for dynamic linking support
2011-06-24 10:13:47 +08:00
fix atomicity and other issues installing dynamic linker symlink ln -sf is non-atomic; it unlinks the destination first. instead, make a temporary link and rename it into place. this commit also fixes some of the dependency tracking behavior for the link. depending on the directory it's to be installed in is not reasonable; it causes a new link to be attempted if the library directory has been modified, but does not attempt to make a new link just because libc has been updated. instead, depend on the target to be linked to. this will ensure that, if prefix has changed but syslibdir has not, the link will be updated to point to the new prefix.
2013-08-17 05:51:38 +08:00
$(DESTDIR)$(LDSO_PATHNAME): $(DESTDIR)$(libdir)/libc.so
fix regression in creation of ldso symlink DESTDIR was wrongly included in the symlink contents.
2013-08-31 23:36:56 +08:00
$(INSTALL) -D -l $(libdir)/libc.so $@ || true
improve the build rules for installing /lib/ld-musl-$ARCH.so these new rules should avoid spurious error messages when the directory (usually /lib) and the dynamic linker symlink already exist, and minimize the spam when they can't be created.
2012-05-05 09:54:57 +08:00
split up installation target patch by Luca Barbato (lu_zero)
2012-08-18 07:32:24 +08:00
install-libs: $(ALL_LIBS:lib/%=$(DESTDIR)$(libdir)/%) $(if $(SHARED_LIBS),$(DESTDIR)$(LDSO_PATHNAME),)
install-headers: $(ALL_INCLUDES:include/%=$(DESTDIR)$(includedir)/%)
install-tools: $(ALL_TOOLS:tools/%=$(DESTDIR)$(bindir)/%)
add tarball-producing targets to Makefile for ease of release my old, out-of-tree release script that performed a clone rather than using git archive checked the VERSION file to make sure that it matched before doing a release. I believe there should be a way to do the same with git commands (without resorting to checking out the desired tag) but I have not yet found a way, so care should be taken when using these targets that the correctness of the VERSION file is not overlooked.
2014-06-26 04:14:37 +08:00
musl-git-%.tar.gz: .git
git archive --format=tar.gz --prefix=$(patsubst %.tar.gz,%,$@)/ -o $@ $(patsubst musl-git-%.tar.gz,%,$@)
split up installation target patch by Luca Barbato (lu_zero)
2012-08-18 07:32:24 +08:00
add tarball-producing targets to Makefile for ease of release my old, out-of-tree release script that performed a clone rather than using git archive checked the VERSION file to make sure that it matched before doing a release. I believe there should be a way to do the same with git commands (without resorting to checking out the desired tag) but I have not yet found a way, so care should be taken when using these targets that the correctness of the VERSION file is not overlooked.
2014-06-26 04:14:37 +08:00
musl-%.tar.gz: .git
git archive --format=tar.gz --prefix=$(patsubst %.tar.gz,%,$@)/ -o $@ v$(patsubst musl-%.tar.gz,%,$@)
split up installation target patch by Luca Barbato (lu_zero)
2012-08-18 07:32:24 +08:00
initial check-in, version 0.5.0
2011-02-12 13:22:29 +08:00
.PRECIOUS: $(CRT_LIBS:lib/%=crt/%)
split up installation target patch by Luca Barbato (lu_zero)
2012-08-18 07:32:24 +08:00
.PHONY: all clean install install-libs install-headers install-tools
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