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configure: Add and use AX_CHECK_COMPILE_FLAG
This makes it a lot clearer what's happening (at least I think so), and will make future additions much simpler. Reviewed-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
This commit is contained in:
Matt Turner
parent
083b49ba9d
commit
e4b2b69e82
109
configure.ac
109
configure.ac
@ -282,85 +282,50 @@ esac
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AM_CONDITIONAL(HAVE_ANDROID, test "x$android" = xyes)
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dnl Add flags for gcc and g++
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if test "x$GCC" = xyes; then
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CFLAGS="$CFLAGS -Wall"
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dnl
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dnl Check compiler flags
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dnl
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AX_CHECK_COMPILE_FLAG([-Wall], [CFLAGS="$CFLAGS -Wall"])
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AX_CHECK_COMPILE_FLAG([-Werror=implicit-function-declaration], [CFLAGS="$CFLAGS -Werror=implicit-function-declaration"])
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AX_CHECK_COMPILE_FLAG([-Werror=missing-prototypes], [CFLAGS="$CFLAGS -Werror=missing-prototypes"])
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AX_CHECK_COMPILE_FLAG([-Wmissing-prototypes], [CFLAGS="$CFLAGS -Wmissing-prototypes"])
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AX_CHECK_COMPILE_FLAG([-fno-math-errno], [CFLAGS="$CFLAGS -fno-math-errno"])
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AX_CHECK_COMPILE_FLAG([-fno-trapping-math], [CFLAGS="$CFLAGS -fno-trapping-math"])
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AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [VISIBILITY_CFLAGS="-fvisibility=hidden"])
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dnl
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dnl Check C++ compiler flags
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dnl
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AC_LANG_PUSH([C++])
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AX_CHECK_COMPILE_FLAG([-Wall], [CXXFLAGS="$CXXFLAGS -Wall"])
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AX_CHECK_COMPILE_FLAG([-fno-math-errno], [CXXFLAGS="$CXXFLAGS -fno-math-errno"])
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AX_CHECK_COMPILE_FLAG([-fno-trapping-math], [CXXFLAGS="$CXXFLAGS -fno-trapping-math"])
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AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [VISIBILITY_CXXFLAGS="-fvisibility=hidden"])
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AC_LANG_POP([C++])
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# Flags to help ensure that certain portions of the code -- and only those
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# portions -- can be built with MSVC:
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# - src/util, src/gallium/auxiliary, rc/gallium/drivers/llvmpipe, and
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# - non-Linux/Posix OpenGL portions needs to build on MSVC 2013 (which
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# supports most of C99)
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# - the rest has no compiler compiler restrictions
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AX_CHECK_COMPILE_FLAG([-Werror=pointer-arith], [MSVC2013_COMPAT_CFLAGS="-Werror=pointer-arith"])
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AX_CHECK_COMPILE_FLAG([-Werror=vla], [MSVC2013_COMPAT_CFLAGS="-Werror=vla"])
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AC_LANG_PUSH([C++])
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AX_CHECK_COMPILE_FLAG([-Werror=pointer-arith], [MSVC2013_COMPAT_CXXFLAGS="-Werror=pointer-arith"])
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AX_CHECK_COMPILE_FLAG([-Werror=vla], [MSVC2013_COMPAT_CXXFLAGS="-Werror=vla"])
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AC_LANG_POP([C++])
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AC_SUBST([MSVC2013_COMPAT_CFLAGS])
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AC_SUBST([MSVC2013_COMPAT_CXXFLAGS])
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if test "x$GCC" = xyes; then
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if test "x$USE_GNU99" = xyes; then
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CFLAGS="$CFLAGS -std=gnu99"
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else
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CFLAGS="$CFLAGS -std=c99"
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fi
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# Enable -Werror=implicit-function-declaration and
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# -Werror=missing-prototypes, if available, or otherwise, just
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# -Wmissing-prototypes. This is particularly useful to avoid
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# generating a loadable driver module that has undefined symbols.
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save_CFLAGS="$CFLAGS"
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AC_MSG_CHECKING([whether $CC supports -Werror=missing-prototypes])
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CFLAGS="$CFLAGS -Werror=implicit-function-declaration"
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CFLAGS="$CFLAGS -Werror=missing-prototypes"
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AC_LINK_IFELSE([AC_LANG_PROGRAM()],
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AC_MSG_RESULT([yes]),
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[CFLAGS="$save_CFLAGS -Wmissing-prototypes";
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AC_MSG_RESULT([no])])
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# Enable -fvisibility=hidden if using a gcc that supports it
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save_CFLAGS="$CFLAGS"
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AC_MSG_CHECKING([whether $CC supports -fvisibility=hidden])
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VISIBILITY_CFLAGS="-fvisibility=hidden"
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CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
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AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
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[VISIBILITY_CFLAGS=""; AC_MSG_RESULT([no])])
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# Restore CFLAGS; VISIBILITY_CFLAGS are added to it where needed.
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CFLAGS=$save_CFLAGS
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# We don't want floating-point math functions to set errno or trap
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CFLAGS="$CFLAGS -fno-math-errno -fno-trapping-math"
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# Flags to help ensure that certain portions of the code -- and only those
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# portions -- can be built with MSVC:
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# - src/util, src/gallium/auxiliary, rc/gallium/drivers/llvmpipe, and
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# - non-Linux/Posix OpenGL portions needs to build on MSVC 2013 (which
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# supports most of C99)
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# - the rest has no compiler compiler restrictions
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MSVC2013_COMPAT_CFLAGS="-Werror=pointer-arith"
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MSVC2013_COMPAT_CXXFLAGS="-Werror=pointer-arith"
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# Enable -Werror=vla if compiler supports it
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save_CFLAGS="$CFLAGS"
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AC_MSG_CHECKING([whether $CC supports -Werror=vla])
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CFLAGS="$CFLAGS -Werror=vla"
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AC_LINK_IFELSE([AC_LANG_PROGRAM()],
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[MSVC2013_COMPAT_CFLAGS="$MSVC2013_COMPAT_CFLAGS -Werror=vla";
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MSVC2013_COMPAT_CXXFLAGS="$MSVC2013_COMPAT_CXXFLAGS -Werror=vla";
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AC_MSG_RESULT([yes])],
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AC_MSG_RESULT([no]))
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CFLAGS="$save_CFLAGS"
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fi
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if test "x$GXX" = xyes; then
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CXXFLAGS="$CXXFLAGS -Wall"
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# Enable -fvisibility=hidden if using a gcc that supports it
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save_CXXFLAGS="$CXXFLAGS"
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AC_MSG_CHECKING([whether $CXX supports -fvisibility=hidden])
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VISIBILITY_CXXFLAGS="-fvisibility=hidden"
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CXXFLAGS="$CXXFLAGS $VISIBILITY_CXXFLAGS"
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AC_LANG_PUSH([C++])
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AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
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[VISIBILITY_CXXFLAGS="" ; AC_MSG_RESULT([no])])
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AC_LANG_POP([C++])
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# Restore CXXFLAGS; VISIBILITY_CXXFLAGS are added to it where needed.
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CXXFLAGS=$save_CXXFLAGS
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# We don't want floating-point math functions to set errno or trap
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CXXFLAGS="$CXXFLAGS -fno-math-errno -fno-trapping-math"
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fi
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AC_SUBST([MSVC2013_COMPAT_CFLAGS])
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AC_SUBST([MSVC2013_COMPAT_CXXFLAGS])
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dnl even if the compiler appears to support it, using visibility attributes isn't
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dnl going to do anything useful currently on cygwin apart from emit lots of warnings
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74
m4/ax_check_compile_flag.m4
Normal file
74
m4/ax_check_compile_flag.m4
Normal file
@ -0,0 +1,74 @@
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
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#
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# DESCRIPTION
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#
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# Check whether the given FLAG works with the current language's compiler
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# or gives an error. (Warnings, however, are ignored)
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#
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# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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# success/failure.
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#
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# If EXTRA-FLAGS is defined, it is added to the current language's default
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# flags (e.g. CFLAGS) when the check is done. The check is thus made with
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# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
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# force the compiler to issue an error when a bad flag is given.
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#
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# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
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#
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# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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#
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# This program 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 the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 5
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AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
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ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
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AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
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[AS_VAR_SET(CACHEVAR,[yes])],
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[AS_VAR_SET(CACHEVAR,[no])])
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_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
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AS_VAR_IF(CACHEVAR,yes,
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[m4_default([$2], :)],
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[m4_default([$3], :)])
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AS_VAR_POPDEF([CACHEVAR])dnl
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])dnl AX_CHECK_COMPILE_FLAGS
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