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Given the lack of support for the LSE128 instructions in all but the the most up-to-date version of Binutils (2.42), having the build-time test for assembler support for these instructions often leads to the building of Libatomic without support for LSE128-dependent atomic function implementations. This ultimately leads to different people having different versions of Libatomic on their machines, depending on which assembler was available at compilation time. Furthermore, the conditional inclusion of these atomic function implementations predicated on assembler support leads to a series of `#if HAVE_FEAT_LSE128' guards scattered throughout the codebase and the need for a series of aliases when the feature flag evaluates to false. The preprocessor macro guards, together with the conditional aliasing leads to code that is cumbersome to understand and maintain. Both of the issues highlighted above will only get worse with the coming support for LRCPC3 atomics which under the current scheme will also require build-time checks. Consequently, a better option for both consistency across builds and code cleanness is to make recourse to the `.inst' directive. By replacing all novel assembly instructions for their hexadecimal representation within `.inst's, we ensure that the Libatomic code is both considerably cleaner and all machines build the same binary, irrespective of binutils version available at compile time. This patch therefore removes all configure checks for LSE128-support in the assembler and all the guards and aliases that were associated with `HAVE_FEAT_LSE128' libatomic/ChangeLog: * acinclude.m4 (LIBAT_TEST_FEAT_AARCH64_LSE128): Delete. * auto-config.h.in (HAVE_FEAT_LSE128): Likewise * config/linux/aarch64/atomic_16.S: Replace all LSE128 instructions with equivalent `.inst' directives. (HAVE_FEAT_LSE128): Remove all references. * configure: Regenerate. * configure.ac: Remove call to LIBAT_TEST_FEAT_AARCH64_LSE128.
312 lines
10 KiB
Plaintext
312 lines
10 KiB
Plaintext
# Process this file with autoreconf to produce a configure script.
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# Copyright (C) 2012-2024 Free Software Foundation, Inc.
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#
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# This file is part of the GNU Atomic Library (libatomic).
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#
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# Libatomic is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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#
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# Under Section 7 of GPL version 3, you are granted additional
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# permissions described in the GCC Runtime Library Exception, version
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# 3.1, as published by the Free Software Foundation.
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#
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# You should have received a copy of the GNU General Public License and
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# a copy of the GCC Runtime Library Exception along with this program;
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# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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# <http://www.gnu.org/licenses/>.
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AC_INIT([GNU Atomic Library], 1.0,,[libatomic])
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AC_CONFIG_HEADER(auto-config.h)
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# -------
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# Options
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# -------
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AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
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LIBAT_ENABLE(version-specific-runtime-libs, no, ,
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[Specify that runtime libraries should be installed in a compiler-specific directory],
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permit yes|no)
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AC_MSG_RESULT($enable_version_specific_runtime_libs)
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# We would like our source tree to be readonly. However when releases or
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# pre-releases are generated, the flex/bison generated files as well as the
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# various formats of manuals need to be included along with the rest of the
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# sources. Therefore we have --enable-generated-files-in-srcdir to do
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# just that.
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AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
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LIBAT_ENABLE(generated-files-in-srcdir, no, ,
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[put copies of generated files in source dir intended for creating source
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tarballs for users without texinfo bison or flex.],
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permit yes|no)
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AC_MSG_RESULT($enable_generated_files_in_srcdir)
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AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
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# -------
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# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
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#
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# You will slowly go insane if you do not grok the following fact: when
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# building this library, the top-level /target/ becomes the library's /host/.
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#
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# configure then causes --target to default to --host, exactly like any
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# other package using autoconf. Therefore, 'target' and 'host' will
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# always be the same. This makes sense both for native and cross compilers
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# just think about it for a little while. :-)
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#
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# Also, if this library is being configured as part of a cross compiler, the
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# top-level configure script will pass the "real" host as $with_cross_host.
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#
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# Do not delete or change the following two lines. For why, see
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# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
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AC_CANONICAL_SYSTEM
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target_alias=${target_alias-$host_alias}
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# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
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# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
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# 1.9.0: minimum required version
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# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
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# of other PACKAGE_* variables will, however, and there's nothing
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# we can do about that; they come from AC_INIT).
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# no-dist: we don't want 'dist' and related rules.
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# foreign: we don't follow the normal rules for GNU packages (no COPYING
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# file in the top srcdir, etc, etc), so stop complaining.
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# -Wall: turns on all automake warnings...
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# -Wno-portability: ...except this one, since GNU make is required.
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# -Wno-override: ... and this one, since we do want this in testsuite.
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AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
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AM_ENABLE_MULTILIB(, ..)
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GCC_WITH_TOOLEXECLIBDIR
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# Calculate toolexeclibdir
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# Also toolexecdir, though it's only used in toolexeclibdir
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case ${enable_version_specific_runtime_libs} in
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yes)
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# Need the gcc compiler version to know where to install libraries
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# and header files if --enable-version-specific-runtime-libs option
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# is selected.
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toolexecdir='$(libdir)/gcc/$(target_alias)'
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toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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;;
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no)
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if test -n "$with_cross_host" &&
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test x"$with_cross_host" != x"no"; then
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# Install a library built with a cross compiler in tooldir, not libdir.
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toolexecdir='$(exec_prefix)/$(target_alias)'
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case ${with_toolexeclibdir} in
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no)
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toolexeclibdir='$(toolexecdir)/lib'
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;;
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*)
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toolexeclibdir=${with_toolexeclibdir}
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;;
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esac
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else
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toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
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toolexeclibdir='$(libdir)'
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fi
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multi_os_directory=`$CC -print-multi-os-directory`
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case $multi_os_directory in
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.) ;; # Avoid trailing /.
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*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
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esac
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;;
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esac
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AC_SUBST(toolexecdir)
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AC_SUBST(toolexeclibdir)
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# Check the compiler.
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# The same as in boehm-gc and libstdc++. Have to borrow it from there.
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# We must force CC to /not/ be precious variables; otherwise
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# the wrong, non-multilib-adjusted value will be used in multilibs.
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# As a side effect, we have to subst CFLAGS ourselves.
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m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
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m4_define([_AC_ARG_VAR_PRECIOUS],[])
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AC_PROG_CC
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AM_PROG_AS
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m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
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AC_SUBST(CFLAGS)
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# In order to override CFLAGS_FOR_TARGET, all of our special flags go
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# in XCFLAGS. But we need them in CFLAGS during configury. So put them
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# in both places for now and restore CFLAGS at the end of config.
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save_CFLAGS="$CFLAGS"
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# Find other programs we need.
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AC_CHECK_TOOL(AR, ar)
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AC_CHECK_TOOL(NM, nm)
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AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
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AC_PROG_INSTALL
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# Configure libtool
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AM_PROG_LIBTOOL
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ACX_LT_HOST_FLAGS
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AC_SUBST(enable_shared)
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AC_SUBST(enable_static)
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AM_MAINTAINER_MODE
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AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])
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# For libtool versioning info, format is CURRENT:REVISION:AGE
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libtool_VERSION=3:0:2
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AC_SUBST(libtool_VERSION)
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# Check for used threading-model
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AC_MSG_CHECKING([for thread model used by GCC])
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target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
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AC_MSG_RESULT([$target_thread_file])
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case "$target" in
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*aarch64*)
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ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse])
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;;
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esac
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AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)
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# Get target configury.
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. ${srcdir}/configure.tgt
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if test -n "$UNSUPPORTED"; then
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AC_MSG_ERROR([Configuration ${target} is unsupported.])
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fi
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# Write out the ifunc resolver arg type.
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AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS,
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[Define ifunc resolver function argument.])
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# Disable fallbacks to __sync routines from libgcc. Otherwise we'll
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# make silly decisions about what the cpu can do.
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CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS"
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# Check header files.
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AC_STDC_HEADERS
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ACX_HEADER_STRING
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GCC_HEADER_STDINT(gstdint.h)
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AC_CHECK_HEADERS([fenv.h])
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# Check for common type sizes
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LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE])
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# Check for compiler builtins of atomic operations.
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LIBAT_TEST_ATOMIC_INIT
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP])
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AC_C_BIGENDIAN
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# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
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AH_BOTTOM(
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[#ifndef WORDS_BIGENDIAN
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#define WORDS_BIGENDIAN 0
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#endif])
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LIBAT_WORDSIZE
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# Check to see if -pthread or -lpthread is needed. Prefer the former.
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# In case the pthread.h system header is not found, this test will fail.
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case " $config_path " in
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*" posix "*)
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XPCFLAGS=""
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CFLAGS="$CFLAGS -pthread"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#include <pthread.h>
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void *g(void *d) { return NULL; }],
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[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
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[XPCFLAGS=" -pthread"],
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[CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#include <pthread.h>
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void *g(void *d) { return NULL; }],
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[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
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[],
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[AC_MSG_ERROR([Pthreads are required to build libatomic])])])
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CFLAGS="$save_CFLAGS $XPCFLAGS"
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;;
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esac
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# See what sort of export controls are available.
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LIBAT_CHECK_ATTRIBUTE_VISIBILITY
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LIBAT_CHECK_ATTRIBUTE_DLLEXPORT
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LIBAT_CHECK_ATTRIBUTE_ALIAS
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if test x$try_ifunc = xyes; then
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LIBAT_CHECK_IFUNC
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fi
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# Check linker support.
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LIBAT_ENABLE_SYMVERS
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# Cleanup and exit.
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CFLAGS="$save_CFLAGS"
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AC_CACHE_SAVE
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AC_ARG_ENABLE([werror],
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[AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
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# Add -Wall -Werror if we are using GCC.
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AS_IF([test "x$GCC" = "xyes"],
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[XCFLAGS="$XCFLAGS -Wall"])
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AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
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[XCFLAGS="$XCFLAGS -Werror"])
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# Add CET specific flags if CET is enabled
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GCC_CET_FLAGS(CET_FLAGS)
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XCFLAGS="$XCFLAGS $CET_FLAGS"
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XCFLAGS="$XCFLAGS $XPCFLAGS"
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AC_SUBST(config_path)
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AC_SUBST(XCFLAGS)
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AC_SUBST(XLDFLAGS)
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AC_SUBST(LIBS)
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AC_SUBST(SIZES)
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# Conditionalize the makefile for this target machine.
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tmake_file_=
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for f in ${tmake_file}
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do
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if test -f ${srcdir}/config/$f
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then
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tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
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fi
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done
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tmake_file="${tmake_file_}"
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AC_SUBST(tmake_file)
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AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes)
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AM_CONDITIONAL(ARCH_AARCH64_LINUX,
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[expr "$config_path" : ".* linux/aarch64 .*" > /dev/null])
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AM_CONDITIONAL(ARCH_ARM_LINUX,
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[expr "$config_path" : ".* linux/arm .*" > /dev/null])
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AM_CONDITIONAL(ARCH_I386,
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[test "$ARCH" = x86 && test x$libat_cv_wordsize = x4])
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AM_CONDITIONAL(ARCH_X86_64,
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[test "$ARCH" = x86 && test x$libat_cv_wordsize = x8])
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# Determine what GCC version number to use in filesystem paths.
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GCC_BASE_VER
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if test ${multilib} = yes; then
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multilib_arg="--enable-multilib"
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else
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multilib_arg=
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fi
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AC_CONFIG_FILES(Makefile testsuite/Makefile)
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AC_CONFIG_FILES(testsuite/libatomic-site-extra.exp)
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AC_OUTPUT
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