forked from vitrine/wmaker
78 lines
2.8 KiB
Plaintext
78 lines
2.8 KiB
Plaintext
 
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# wm_cflags_check.m4 - Macros to check options for the compiler into CFLAGS
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#
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# Copyright (c) 2013 Christophe CURIS
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General 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, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# WM_CFLAGS_CHECK_FIRST
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# ---------------------
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#
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# For each option provided, check which one is supported and stops when
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# found, adding it to CFLAGS. It extends AX_CFLAGS_GCC_OPTION which does
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# not checks for fallbacks; as a bonus it uses a shared function to
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# produce smaller configure script.
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#
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# Usage: WM_CFLAGS_CHECK_FIRST([message], [option alt_option...])
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# $1 message: required, message displayed in 'Checking for...'
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# $2 option_list: list of options, tested in given order
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#
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# The first option that works is added to CFLAGS
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AC_DEFUN([WM_CFLAGS_CHECK_FIRST],
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[AC_REQUIRE([_WM_SHELLFN_CHKCFLAGS])
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m4_define([_wm_optlist], m4_split([$2]))dnl
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AS_VAR_PUSHDEF([VAR], [wm_cv_c_check_compopt[]m4_car(_wm_optlist)])dnl
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m4_define([_wm_trimmed_optlist], m4_join([ ], _wm_optlist))dnl
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AC_CACHE_CHECK([CFLAGS for m4_ifnblank($1,$1,m4_car(_wm_optlist))], VAR,
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[VAR="no, unknown"
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for wm_option in _wm_trimmed_optlist ; do
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AS_IF([wm_fn_c_try_compile_cflag "$wm_option"],
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[VAR="$wm_option" ; break])
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done])
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AS_CASE([$VAR],
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[no,*], [],
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[AS_IF([echo " $CFLAGS " | grep " $VAR " 2>&1 > /dev/null],
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[AC_MSG_WARN([option $VAR already present in \$CFLAGS, not appended])],
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[CFLAGS="$CFLAGS $VAR"]) ])
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AS_VAR_POPDEF([VAR])dnl
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m4_undefine([_wm_optlist])dnl
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m4_undefine([_wm_trimmed_optlist])dnl
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])
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# _WM_SHELLFN_CHKCFLAGS
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# ---------------------
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# (internal shell function)
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#
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# Create a shell function that tries compiling a simple program with the
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# specified compiler option. Assumes the current compilation language is
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# already set to C
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AC_DEFUN_ONCE([_WM_SHELLFN_CHKCFLAGS],
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[@%:@ wm_fn_c_try_compile_cflag CC_OPTION
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@%:@ -----------------------------------
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@%:@ Try compiling a function using CC_OPTION in the compiler's options
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wm_fn_c_try_compile_cflag ()
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{
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wm_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror $[]1"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([], [])],
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[wm_retval=0],
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[wm_retval=1])
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CFLAGS="$wm_save_CFLAGS"
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AS_SET_STATUS([$wm_retval])
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}
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])
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