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buildroot/package/Makefile.in
Thomas Petazzoni 3c427c6472 Config.in: introduce BR2_TIME_BITS_64 option for Y2038 compatibility 
Y2038 is now almost only 15 years away, and embedded systems built
today are potentially going to still be operational in 15 years, and
even though they are supposed to receive updates by then, we all know
how things go, and potentially some of these embedded systems will not
receive any update.

In 2038, the signed 32-bit representation of time_t used on 32-bit
architectures will overflow, causing all time-related functions to go
back in time in a surprising way.

The Linux kernel has already been modified to support a 64-bit
representation of time_t on 32-bit architectures, but from a C library
perspective, the situation varies:

 - glibc uses this 64-bit time_t representation on 32-bit systems
   since glibc 2.34, but only if -D_TIME_BITS=64 is
   specified. Therefore, this commit adds an option to add this flag
   globally to the build, when glibc is the C library and the
   architecture is not 64-bit.

 - musl uses unconditionally a 64-bit time_t representation on 32-bit
   systems since musl 1.2.0. So there is nothing to do here since
   Buildroot has been using a musl >= 1.2.0, used since Buildroot
   2020.05. No Buildroot option is needed here.

 - uClibc-ng does not support a 64-bit time_t representation on 32-bit
   systems, so systems using uClibc-ng will not be Y2038 compliant, at
   least for now. No Buildroot option is needed here.

It should be noted that being Y2038-compliant will only work if all
application/library code is correct. For example if an
application/library stores a timestamp in an "int" instead of using
the proper time_t type, then the mechanisms described above will not
fix this, and the application/library will continue to be broken in
terms of Y2038 support.

Possible discussions points about this patch:

 - Should we have an option at all, or should we unconditionally pass
   -D_TIME_BITS=64, like we have been doing for _FILE_OFFSET_BITS=64
   for quite some time. The reasoning for having an option is that
   the mechanism is itself opt-in in glibc, and generally relatively
   new, so it seemed logical for now to make it optional as well in
   Buildroot.

 - Should we show something (a Config.in comment?) in the musl and
   uClibc-ng case to let the user know that the code is Y2038
   compliant (musl) or not Y2038 compliant (uClibc-ng). Or should this
   discussion be part of the Buildroot documentation?

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2023-10-01 21:14:06 +02:00

453 lines
14 KiB
Makefile
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ifndef MAKE
MAKE := make
endif
ifndef HOSTMAKE
HOSTMAKE = $(MAKE)
endif
HOSTMAKE := $(shell which $(HOSTMAKE) || type -p $(HOSTMAKE) || echo make)
# If BR2_JLEVEL is 0, scale the maximum concurrency with the number of
# CPUs. An additional job is used in order to keep processors busy
# while waiting on I/O.
# If the number of processors is not available, assume one.
ifeq ($(BR2_JLEVEL),0)
PARALLEL_JOBS := $(shell echo \
$$((1 + `getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1`)))
else
PARALLEL_JOBS := $(BR2_JLEVEL)
endif
# Only build one job at a time, *and* to not randomise goals and
# prerequisites ordering in make 4.4+
MAKE1 := $(HOSTMAKE) -j1 $(if $(findstring --shuffle,$(MAKEFLAGS)),--shuffle=none)
override MAKE = $(HOSTMAKE) \
$(if $(findstring j,$(filter-out --%,$(MAKEFLAGS))),,-j$(PARALLEL_JOBS))
ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
TARGET_VENDOR = $(call qstrip,$(BR2_TOOLCHAIN_BUILDROOT_VENDOR))
else
TARGET_VENDOR = buildroot
endif
# Sanity checks
ifeq ($(TARGET_VENDOR),)
$(error BR2_TOOLCHAIN_BUILDROOT_VENDOR is not allowed to be empty)
endif
ifeq ($(TARGET_VENDOR),unknown)
$(error BR2_TOOLCHAIN_BUILDROOT_VENDOR cannot be 'unknown'. \
It might be confused with the native toolchain)
endif
# Compute GNU_TARGET_NAME
GNU_TARGET_NAME = $(ARCH)-$(TARGET_VENDOR)-$(TARGET_OS)-$(LIBC)$(ABI)
# FLAT binary format needs uclinux, except RISC-V 64-bits which needs
# the regular linux name.
ifeq ($(BR2_BINFMT_FLAT):$(BR2_RISCV_64),y:)
TARGET_OS = uclinux
else
TARGET_OS = linux
endif
ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
LIBC = uclibc
else ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
LIBC = musl
else ifeq ($(BR2_TOOLCHAIN_USES_GLIBC),y)
LIBC = gnu
else ifeq ($(BR_BUILDING),y)
# This happens if there is a bug in Buildroot that allows an
# architecture configuration that isn't supported by any library.
$(error No C library enabled, this is not possible.)
endif
# The ABI suffix is a bit special on ARM, as it needs to be
# -uclibcgnueabi for uClibc EABI, and -gnueabi for glibc EABI.
# This means that the LIBC and ABI aren't strictly orthogonal,
# which explains why we need the test on LIBC below.
ifeq ($(BR2_arm)$(BR2_armeb),y)
ifeq ($(LIBC),uclibc)
ABI = gnueabi
else
ABI = eabi
endif
ifeq ($(BR2_ARM_EABIHF),y)
ABI := $(ABI)hf
endif
endif
# For FSL PowerPC there's SPE
ifeq ($(BR2_POWERPC_CPU_HAS_SPE),y)
ABI = spe
# MPC8540s are e500v1 with single precision FP
ifeq ($(BR2_powerpc_8540),y)
TARGET_ABI += -mabi=spe -mfloat-gprs=single -Wa,-me500
endif
ifeq ($(BR2_powerpc_8548),y)
TARGET_ABI += -mabi=spe -mfloat-gprs=double -Wa,-me500x2
endif
ifeq ($(BR2_powerpc_e500mc),y)
TARGET_ABI += -mabi=spe -mfloat-gprs=double -Wa,-me500mc
endif
endif
# Use longcalls option for Xtensa globally.
# The 'longcalls' option allows calls across a greater range of addresses,
# and is required for some packages. While this option can degrade both
# code size and performance, the linker can usually optimize away the
# overhead when a call ends up within a certain range.
#
# Use auto-litpools for Xtensa globally.
# Collecting literals into separate section can be advantageous if that
# section is placed into DTCM at link time. This is applicable for code
# running on bare metal, but makes no sense under linux, where userspace
# is isolated from the physical memory details. OTOH placing literals into
# separate section breaks build of huge source files, because l32r
# instruction can only access literals in 256 KBytes range.
#
ifeq ($(BR2_xtensa),y)
TARGET_ABI += -mlongcalls -mauto-litpools
endif
STAGING_SUBDIR = $(GNU_TARGET_NAME)/sysroot
STAGING_DIR = $(HOST_DIR)/$(STAGING_SUBDIR)
ifeq ($(BR2_OPTIMIZE_0),y)
TARGET_OPTIMIZATION = -O0
endif
ifeq ($(BR2_OPTIMIZE_1),y)
TARGET_OPTIMIZATION = -O1
endif
ifeq ($(BR2_OPTIMIZE_2),y)
TARGET_OPTIMIZATION = -O2
endif
ifeq ($(BR2_OPTIMIZE_3),y)
TARGET_OPTIMIZATION = -O3
endif
ifeq ($(BR2_OPTIMIZE_G),y)
TARGET_OPTIMIZATION = -Og
endif
ifeq ($(BR2_OPTIMIZE_S),y)
TARGET_OPTIMIZATION = -Os
endif
ifeq ($(BR2_OPTIMIZE_FAST),y)
TARGET_OPTIMIZATION = -Ofast
endif
ifeq ($(BR2_ENABLE_DEBUG),)
TARGET_DEBUGGING = -g0
endif
ifeq ($(BR2_DEBUG_1),y)
TARGET_DEBUGGING = -g1
endif
ifeq ($(BR2_DEBUG_2),y)
TARGET_DEBUGGING = -g2
endif
ifeq ($(BR2_DEBUG_3),y)
TARGET_DEBUGGING = -g3
endif
TARGET_LDFLAGS = $(call qstrip,$(BR2_TARGET_LDFLAGS))
# By design, _FORTIFY_SOURCE requires gcc optimization to be enabled.
# Therefore, we need to pass _FORTIFY_SOURCE and the optimization level
# through the same mechanism, i.e currently through CFLAGS. Passing
# _FORTIFY_SOURCE through the wrapper and the optimization level
# through CFLAGS would not work, because CFLAGS are sometimes
# ignored/overridden by packages, but the flags passed by the wrapper
# are enforced: this would cause _FORTIFY_SOURCE to be used without any
# optimization level, leading to a build / configure failure. So we keep
# passing _FORTIFY_SOURCE and the optimization level both through CFLAGS.
ifeq ($(BR2_FORTIFY_SOURCE_1),y)
TARGET_HARDENED += -D_FORTIFY_SOURCE=1
else ifeq ($(BR2_FORTIFY_SOURCE_2),y)
TARGET_HARDENED += -D_FORTIFY_SOURCE=2
else ifeq ($(BR2_FORTIFY_SOURCE_3),y)
TARGET_HARDENED += -D_FORTIFY_SOURCE=3
endif
TARGET_CPPFLAGS += -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
ifeq ($(BR2_TIME_BITS_64),y)
TARGET_CPPFLAGS += -D_TIME_BITS=64
endif
TARGET_CFLAGS = $(TARGET_CPPFLAGS) $(TARGET_ABI) $(TARGET_OPTIMIZATION) $(TARGET_DEBUGGING) $(TARGET_HARDENED)
TARGET_CXXFLAGS = $(TARGET_CFLAGS)
TARGET_FCFLAGS = $(TARGET_ABI) $(TARGET_OPTIMIZATION) $(TARGET_DEBUGGING)
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79509
ifeq ($(BR2_m68k_cf),y)
TARGET_CFLAGS += -fno-dwarf2-cfi-asm
TARGET_CXXFLAGS += -fno-dwarf2-cfi-asm
endif
ifeq ($(BR2_BINFMT_FLAT),y)
ifeq ($(BR2_RISCV_64),y)
TARGET_CFLAGS += -fPIC
endif
ifeq ($(BR2_BINFMT_FLAT_ONE),y)
ELF2FLT_FLAGS = $(if $($(PKG)_FLAT_STACKSIZE),\
-Wl$(comma)-elf2flt="-r -s$($(PKG)_FLAT_STACKSIZE)",\
-Wl$(comma)-elf2flt=-r)
else
ELF2FLT_FLAGS = $(if $($(PKG)_FLAT_STACKSIZE),\
-Wl$(comma)-elf2flt=-s$($(PKG)_FLAT_STACKSIZE),\
-Wl$(comma)-elf2flt)
endif
TARGET_CFLAGS += $(ELF2FLT_FLAGS)
TARGET_CXXFLAGS += $(ELF2FLT_FLAGS)
TARGET_FCFLAGS += $(ELF2FLT_FLAGS)
TARGET_LDFLAGS += $(ELF2FLT_FLAGS)
endif
ifeq ($(BR2_BINFMT_FLAT_SHARED),y)
TARGET_LDFLAGS += -mid-shared-library -mshared-library-id=0
TARGET_CFLAGS += -mid-shared-library -mshared-library-id=0
TARGET_FCFLAGS += -mid-shared-library -mshared-library-id=0
TARGET_CXXFLAGS += -mid-shared-library -mshared-library-id=0
endif
ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
TARGET_CROSS = $(HOST_DIR)/bin/$(GNU_TARGET_NAME)-
else
TARGET_CROSS = $(HOST_DIR)/bin/$(TOOLCHAIN_EXTERNAL_PREFIX)-
endif
# gcc-4.7 and later ships with wrappers that will automatically pass
# arguments to the binutils tools. Those are paths to necessary linker
# plugins.
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_7),y)
TARGET_GCC_WRAPPERS_PREFIX = gcc-
endif
# Define TARGET_xx variables for all common binutils/gcc
TARGET_AR = $(TARGET_CROSS)$(TARGET_GCC_WRAPPERS_PREFIX)ar
TARGET_AS = $(TARGET_CROSS)as
TARGET_CC = $(TARGET_CROSS)gcc
TARGET_CPP = $(TARGET_CROSS)cpp
TARGET_CXX = $(TARGET_CROSS)g++
TARGET_FC = $(TARGET_CROSS)gfortran
TARGET_LD = $(TARGET_CROSS)ld
TARGET_NM = $(TARGET_CROSS)$(TARGET_GCC_WRAPPERS_PREFIX)nm
TARGET_RANLIB = $(TARGET_CROSS)$(TARGET_GCC_WRAPPERS_PREFIX)ranlib
TARGET_READELF = $(TARGET_CROSS)readelf
TARGET_OBJCOPY = $(TARGET_CROSS)objcopy
TARGET_OBJDUMP = $(TARGET_CROSS)objdump
ifeq ($(BR2_STRIP_strip),y)
STRIP_STRIP_DEBUG := --strip-debug
TARGET_STRIP = $(TARGET_CROSS)strip
STRIPCMD = $(TARGET_CROSS)strip --remove-section=.comment --remove-section=.note
else
TARGET_STRIP = /bin/true
STRIPCMD = $(TARGET_STRIP)
endif
INSTALL := $(shell which install || type -p install)
UNZIP := $(shell which unzip || type -p unzip) -q
APPLY_PATCHES = PATH=$(HOST_DIR)/bin:$$PATH support/scripts/apply-patches.sh $(if $(QUIET),-s)
HOST_CPPFLAGS = -I$(HOST_DIR)/include
HOST_CFLAGS ?= -O2
HOST_CFLAGS += $(HOST_CPPFLAGS)
HOST_CXXFLAGS += $(HOST_CFLAGS)
HOST_LDFLAGS += -L$(HOST_DIR)/lib -Wl,-rpath,$(HOST_DIR)/lib
# host-intltool should be executed with the system perl, so we save
# the path to the system perl, before a host-perl built by Buildroot
# might get installed into $(HOST_DIR)/bin and therefore appears
# in our PATH. This system perl will be used as INTLTOOL_PERL.
export PERL=$(shell which perl)
# host-intltool needs libxml-parser-perl, which Buildroot installs in
# $(HOST_DIR)/lib/perl, so we must make sure that the system perl
# finds this perl module by exporting the proper value for PERL5LIB.
export PERL5LIB=$(HOST_DIR)/lib/perl
TARGET_MAKE_ENV = PATH=$(BR_PATH)
TARGET_CONFIGURE_OPTS = \
$(TARGET_MAKE_ENV) \
AR="$(TARGET_AR)" \
AS="$(TARGET_AS)" \
LD="$(TARGET_LD)" \
NM="$(TARGET_NM)" \
CC="$(TARGET_CC)" \
GCC="$(TARGET_CC)" \
CPP="$(TARGET_CPP)" \
CXX="$(TARGET_CXX)" \
FC="$(TARGET_FC)" \
F77="$(TARGET_FC)" \
RANLIB="$(TARGET_RANLIB)" \
READELF="$(TARGET_READELF)" \
STRIP="$(TARGET_STRIP)" \
OBJCOPY="$(TARGET_OBJCOPY)" \
OBJDUMP="$(TARGET_OBJDUMP)" \
AR_FOR_BUILD="$(HOSTAR)" \
AS_FOR_BUILD="$(HOSTAS)" \
CC_FOR_BUILD="$(HOSTCC)" \
GCC_FOR_BUILD="$(HOSTCC)" \
CXX_FOR_BUILD="$(HOSTCXX)" \
LD_FOR_BUILD="$(HOSTLD)" \
CPPFLAGS_FOR_BUILD="$(HOST_CPPFLAGS)" \
CFLAGS_FOR_BUILD="$(HOST_CFLAGS)" \
CXXFLAGS_FOR_BUILD="$(HOST_CXXFLAGS)" \
LDFLAGS_FOR_BUILD="$(HOST_LDFLAGS)" \
FCFLAGS_FOR_BUILD="$(HOST_FCFLAGS)" \
DEFAULT_ASSEMBLER="$(TARGET_AS)" \
DEFAULT_LINKER="$(TARGET_LD)" \
CPPFLAGS="$(TARGET_CPPFLAGS)" \
CFLAGS="$(TARGET_CFLAGS)" \
CXXFLAGS="$(TARGET_CXXFLAGS)" \
LDFLAGS="$(TARGET_LDFLAGS)" \
FCFLAGS="$(TARGET_FCFLAGS)" \
FFLAGS="$(TARGET_FCFLAGS)" \
PKG_CONFIG="$(PKG_CONFIG_HOST_BINARY)" \
STAGING_DIR="$(STAGING_DIR)" \
INTLTOOL_PERL=$(PERL)
HOST_MAKE_ENV = \
PATH=$(BR_PATH) \
PKG_CONFIG="$(PKG_CONFIG_HOST_BINARY)" \
PKG_CONFIG_SYSROOT_DIR="/" \
PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 \
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 \
PKG_CONFIG_LIBDIR="$(HOST_DIR)/lib/pkgconfig:$(HOST_DIR)/share/pkgconfig"
HOST_CONFIGURE_OPTS = \
$(HOST_MAKE_ENV) \
AR="$(HOSTAR)" \
AS="$(HOSTAS)" \
LD="$(HOSTLD)" \
NM="$(HOSTNM)" \
CC="$(HOSTCC)" \
GCC="$(HOSTCC)" \
CXX="$(HOSTCXX)" \
CPP="$(HOSTCPP)" \
OBJCOPY="$(HOSTOBJCOPY)" \
RANLIB="$(HOSTRANLIB)" \
CPPFLAGS="$(HOST_CPPFLAGS)" \
CFLAGS="$(HOST_CFLAGS)" \
CXXFLAGS="$(HOST_CXXFLAGS)" \
LDFLAGS="$(HOST_LDFLAGS)" \
INTLTOOL_PERL=$(PERL)
# This is extra environment we can not export ourselves (eg. because some
# packages use that variable internally, eg. uboot), so we have to
# explicitly pass it to user-supplied external hooks (eg. post-build,
# post-images)
EXTRA_ENV = \
PATH=$(BR_PATH) \
BR2_DL_DIR=$(BR2_DL_DIR) \
BUILD_DIR=$(BUILD_DIR) \
CONFIG_DIR=$(CONFIG_DIR) \
O=$(CANONICAL_O)
################################################################################
# settings we need to pass to configure
# does unaligned access trap?
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=yes
ifeq ($(BR2_i386),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_x86_64),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_m68k),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_ENDIAN),"BIG")
BR2_AC_CV_C_BIGENDIAN = ac_cv_c_bigendian=yes
else
BR2_AC_CV_C_BIGENDIAN = ac_cv_c_bigendian=no
endif
# AM_GNU_GETTEXT misdetects musl gettext support.
# musl currently implements api level 1 and 2 (basic + ngettext)
# http://www.openwall.com/lists/musl/2015/04/16/3
#
# These autoconf variables should only be pre-seeded when the minimal
# gettext implementation of musl is used. When the full blown
# implementation provided by gettext libintl is used, auto-detection
# works fine, and pre-seeding those values is actually wrong.
ifeq ($(BR2_TOOLCHAIN_USES_MUSL):$(BR2_PACKAGE_GETTEXT_PROVIDES_LIBINTL),y:)
BR2_GT_CV_FUNC_GNUGETTEXT_LIBC = \
gt_cv_func_gnugettext1_libc=yes \
gt_cv_func_gnugettext2_libc=yes
endif
TARGET_CONFIGURE_ARGS = \
$(BR2_AC_CV_TRAP_CHECK) \
ac_cv_func_mmap_fixed_mapped=yes \
ac_cv_func_memcmp_working=yes \
ac_cv_have_decl_malloc=yes \
gl_cv_func_malloc_0_nonnull=yes \
ac_cv_func_malloc_0_nonnull=yes \
ac_cv_func_calloc_0_nonnull=yes \
ac_cv_func_realloc_0_nonnull=yes \
lt_cv_sys_lib_search_path_spec="" \
$(BR2_AC_CV_C_BIGENDIAN) \
$(BR2_GT_CV_FUNC_GNUGETTEXT_LIBC)
################################################################################
ifeq ($(BR2_SYSTEM_ENABLE_NLS),y)
NLS_OPTS = --enable-nls
TARGET_NLS_DEPENDENCIES = host-gettext
ifeq ($(BR2_PACKAGE_GETTEXT_PROVIDES_LIBINTL),y)
TARGET_NLS_DEPENDENCIES += gettext
TARGET_NLS_LIBS += -lintl
endif
else
NLS_OPTS = --disable-nls
endif
# We need anything that is invalid. Traditionally, we'd have used 'false' (and
# we did so in the past). However, that breaks libtool for packages that have
# optional C++ support (e.g. gnutls), because libtool will *require* a *valid*
# C++ preprocessor as long as CXX is not 'no'.
# Now, whether we use 'no' or 'false' for CXX as the same side effect: it is an
# invalid C++ compiler, and thus will cause detection of C++ to fail (which is
# expected and what we want), while at the same time taming libtool into
# silence.
ifneq ($(BR2_INSTALL_LIBSTDCPP),y)
TARGET_CONFIGURE_OPTS += CXX=no
endif
ifeq ($(BR2_STATIC_LIBS),y)
SHARED_STATIC_LIBS_OPTS = --enable-static --disable-shared
TARGET_CFLAGS += -static
TARGET_CXXFLAGS += -static
TARGET_FCFLAGS += -static
TARGET_LDFLAGS += -static
else ifeq ($(BR2_SHARED_LIBS),y)
SHARED_STATIC_LIBS_OPTS = --disable-static --enable-shared
else ifeq ($(BR2_SHARED_STATIC_LIBS),y)
SHARED_STATIC_LIBS_OPTS = --enable-static --enable-shared
endif
# Used by our binutils patches.
export BR_COMPILER_PARANOID_UNSAFE_PATH=enabled
include package/pkg-download.mk
include package/pkg-autotools.mk
include package/pkg-cmake.mk
include package/pkg-luarocks.mk
include package/pkg-perl.mk
include package/pkg-python.mk
include package/pkg-virtual.mk
include package/pkg-generic.mk
include package/pkg-kconfig.mk
include package/pkg-rebar.mk
include package/pkg-kernel-module.mk
include package/pkg-waf.mk
include package/pkg-golang.mk
include package/pkg-meson.mk
include package/pkg-qmake.mk
include package/pkg-cargo.mk
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