added use of AX_CHECK_COMPILE_FLAG Autoconf macro
This commit is contained in:
Marco Maggi
parent
633b3a2a50
commit
d84a5f6caa
@ -1,7 +1,7 @@
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# acinclude.m4 --
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#
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dnl m4_include(meta/autoconf/ax-check-compile-flag.m4)
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dnl m4_include(meta/autoconf/ax-gcc-version.m4)
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m4_include(conftools/ax-check-compile-flag.m4)
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dnl m4_include(conftools/ax-gcc-version.m4)
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### end of file
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@ -69,25 +69,22 @@ AC_SUBST(LIBAGE)
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AC_PROG_CC_C99
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AC_PROG_CXX
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AS_IF([test "$GCC" = yes],[
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dnl
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dnl Be careful about adding the -fexceptions option; some versions of
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dnl GCC don't support it and it causes extra warnings that are only
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dnl distracting; avoid.
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dnl
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OLDCFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wstrict-prototypes"
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CFLAGS="$OLDCFLAGS -fexceptions"
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AC_MSG_CHECKING(whether $CC accepts -fexceptions)
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AC_TRY_LINK( , ,
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AC_MSG_RESULT(yes),
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AC_MSG_RESULT(no); CFLAGS="$OLDCFLAGS")
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AS_IF([test "x$CXXFLAGS" = x],
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[CXXFLAGS=`echo "$CFLAGS" | sed 's/ -Wmissing-prototypes -Wstrict-prototypes//'`])
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AS_IF([test "$GCC" = yes],
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[AS_VAR_APPEND(CFLAGS," -Wall -Wmissing-prototypes -Wstrict-prototypes")
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CFLAGS="${CFLAGS} -fno-strict-aliasing"
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CXXFLAGS="${CXXFLAGS} -fno-strict-aliasing"
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LDFLAGS="${LDFLAGS} -fno-strict-aliasing"
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])
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dnl Be careful about adding the -fexceptions option; some versions of
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dnl GCC don't support it and it causes extra warnings that are only
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dnl distracting; avoid.
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AX_CHECK_COMPILE_FLAG([-fexceptions],
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[AS_VAR_APPEND(CFLAGS," -fexceptions")],
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[AC_MSG_WARN([The GCC compiler does not support -fexceptions.])])
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AS_IF([test "x$CXXFLAGS" = x],
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[CXXFLAGS=`echo "$CFLAGS" | sed 's/ -Wmissing-prototypes -Wstrict-prototypes//'`])
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AS_VAR_APPEND(CFLAGS, " -fno-strict-aliasing")
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AS_VAR_APPEND(CXXFLAGS, " -fno-strict-aliasing")
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AS_VAR_APPEND(LDFLAGS, " -fno-strict-aliasing")])
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AC_MSG_CHECKING(whether compiler supports visibility)
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AS_VAR_SET(OLDCFLAGS,$CFLAGS)
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74
expat/conftools/ax-check-compile-flag.m4
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74
expat/conftools/ax-check-compile-flag.m4
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@ -0,0 +1,74 @@
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# ===========================================================================
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# http://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 <http://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 4
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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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