1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_cflags_gcc_option.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]]) 8# 9# DESCRIPTION 10# 11# AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like 12# "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the optionflag 13# to CFLAGS if it is understood. You can override the shellvar-default of 14# CFLAGS of course. The order of arguments stems from the explicit macros 15# like AX_CFLAGS_WARN_ALL. 16# 17# The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add to 18# CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it 19# is possible to use different compilers for C and C++). 20# 21# The macro is a lot simpler than any special AX_CFLAGS_* macro (or 22# ax_cxx_rtti.m4 macro) but allows to check for arbitrary options. 23# However, if you use this macro in a few places, it would be great if you 24# would make up a new function-macro and submit it to the ac-archive. 25# 26# - $1 option-to-check-for : required ("-option" as non-value) 27# - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case) 28# - $3 action-if-found : add value to shellvariable 29# - $4 action-if-not-found : nothing 30# 31# Note: in earlier versions, $1-$2 were swapped. We try to detect the 32# situation and accept a $2=~/-/ as being the old option-to-check-for. 33# 34# There are other variants that emerged from the original macro variant 35# which did just test an option to be possibly added. However, some 36# compilers accept an option silently, or possibly for just another option 37# that was not intended. Therefore, we have to do a generic test for a 38# compiler family. For gcc we check "-pedantic" being accepted which is 39# also understood by compilers who just want to be compatible with gcc 40# even when not being made from gcc sources. 41# 42# See also: AX_CFLAGS_SUN_OPTION, AX_CFLAGS_HPUX_OPTION, 43# AX_CFLAGS_AIX_OPTION, and AX_CFLAGS_IRIX_OPTION. 44# 45# LICENSE 46# 47# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 48# 49# This program is free software; you can redistribute it and/or modify it 50# under the terms of the GNU General Public License as published by the 51# Free Software Foundation; either version 2 of the License, or (at your 52# option) any later version. 53# 54# This program is distributed in the hope that it will be useful, but 55# WITHOUT ANY WARRANTY; without even the implied warranty of 56# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 57# Public License for more details. 58# 59# You should have received a copy of the GNU General Public License along 60# with this program. If not, see <http://www.gnu.org/licenses/>. 61# 62# As a special exception, the respective Autoconf Macro's copyright owner 63# gives unlimited permission to copy, distribute and modify the configure 64# scripts that are the output of Autoconf when processing the Macro. You 65# need not follow the terms of the GNU General Public License when using 66# or distributing such scripts, even though portions of the text of the 67# Macro appear in them. The GNU General Public License (GPL) does govern 68# all other use of the material that constitutes the Autoconf Macro. 69# 70# This special exception to the GPL applies to versions of the Autoconf 71# Macro released by the Autoconf Archive. When you make and distribute a 72# modified version of the Autoconf Macro, you may extend this special 73# exception to the GPL to apply to your modified version as well. 74 75#serial 8 76 77AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl 78AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl 79AS_VAR_PUSHDEF([VAR],[ax_cv_cflags_gcc_option_$2])dnl 80AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)], 81VAR,[VAR="no, unknown" 82 AC_LANG_SAVE 83 AC_LANG_C 84 ac_save_[]FLAGS="$[]FLAGS" 85for ac_arg dnl 86in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC 87 "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC 88 # 89do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` 90 AC_TRY_COMPILE([],[return 0;], 91 [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) 92done 93 FLAGS="$ac_save_[]FLAGS" 94 AC_LANG_RESTORE 95]) 96case ".$VAR" in 97 .ok|.ok,*) m4_ifvaln($3,$3) ;; 98 .|.no|.no,*) m4_ifvaln($4,$4) ;; 99 *) m4_ifvaln($3,$3,[ 100 if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null 101 then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR]) 102 else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"]) 103 m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR" 104 fi ]) ;; 105esac 106AS_VAR_POPDEF([VAR])dnl 107AS_VAR_POPDEF([FLAGS])dnl 108]) 109 110 111dnl the only difference - the LANG selection... and the default FLAGS 112 113AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl 114AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl 115AS_VAR_PUSHDEF([VAR],[ax_cv_cxxflags_gcc_option_$2])dnl 116AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)], 117VAR,[VAR="no, unknown" 118 AC_LANG_SAVE 119 AC_LANG_CPLUSPLUS 120 ac_save_[]FLAGS="$[]FLAGS" 121for ac_arg dnl 122in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC 123 "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC 124 # 125do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` 126 AC_TRY_COMPILE([],[return 0;], 127 [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) 128done 129 FLAGS="$ac_save_[]FLAGS" 130 AC_LANG_RESTORE 131]) 132case ".$VAR" in 133 .ok|.ok,*) m4_ifvaln($3,$3) ;; 134 .|.no|.no,*) m4_ifvaln($4,$4) ;; 135 *) m4_ifvaln($3,$3,[ 136 if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null 137 then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR]) 138 else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"]) 139 m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR" 140 fi ]) ;; 141esac 142AS_VAR_POPDEF([VAR])dnl 143AS_VAR_POPDEF([FLAGS])dnl 144]) 145 146dnl ------------------------------------------------------------------------- 147 148AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl 149AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl 150AS_VAR_PUSHDEF([VAR],[ax_cv_cflags_gcc_option_$1])dnl 151AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)], 152VAR,[VAR="no, unknown" 153 AC_LANG_SAVE 154 AC_LANG_C 155 ac_save_[]FLAGS="$[]FLAGS" 156for ac_arg dnl 157in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC 158 "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC 159 # 160do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` 161 AC_TRY_COMPILE([],[return 0;], 162 [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) 163done 164 FLAGS="$ac_save_[]FLAGS" 165 AC_LANG_RESTORE 166]) 167case ".$VAR" in 168 .ok|.ok,*) m4_ifvaln($3,$3) ;; 169 .|.no|.no,*) m4_ifvaln($4,$4) ;; 170 *) m4_ifvaln($3,$3,[ 171 if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null 172 then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR]) 173 else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"]) 174 m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR" 175 fi ]) ;; 176esac 177AS_VAR_POPDEF([VAR])dnl 178AS_VAR_POPDEF([FLAGS])dnl 179]) 180 181 182dnl the only difference - the LANG selection... and the default FLAGS 183 184AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl 185AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl 186AS_VAR_PUSHDEF([VAR],[ax_cv_cxxflags_gcc_option_$1])dnl 187AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)], 188VAR,[VAR="no, unknown" 189 AC_LANG_SAVE 190 AC_LANG_CPLUSPLUS 191 ac_save_[]FLAGS="$[]FLAGS" 192for ac_arg dnl 193in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC 194 "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC 195 # 196do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` 197 AC_TRY_COMPILE([],[return 0;], 198 [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) 199done 200 FLAGS="$ac_save_[]FLAGS" 201 AC_LANG_RESTORE 202]) 203case ".$VAR" in 204 .ok|.ok,*) m4_ifvaln($3,$3) ;; 205 .|.no|.no,*) m4_ifvaln($4,$4) ;; 206 *) m4_ifvaln($3,$3,[ 207 if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null 208 then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR]) 209 else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"]) 210 m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR" 211 fi ]) ;; 212esac 213AS_VAR_POPDEF([VAR])dnl 214AS_VAR_POPDEF([FLAGS])dnl 215]) 216 217AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1, 218[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])]) 219 220AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1, 221[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])]) 222