1
##### http://autoconf-archive.cryp.to/ax_cflags_gcc_option.html
5
# AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
9
# AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
10
# "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the
11
# optionflag to CFLAGS if it is understood. You can override the
12
# shellvar-default of CFLAGS of course. The order of arguments stems
13
# from the explicit macros like AX_CFLAGS_WARN_ALL.
15
# The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add
16
# to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
17
# (since it is possible to use different compilers for C and C++).
19
# The macro is a lot simpler than any special AX_CFLAGS_* macro (or
20
# ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
21
# However, if you use this macro in a few places, it would be great
22
# if you would make up a new function-macro and submit it to the
25
# - $1 option-to-check-for : required ("-option" as non-value)
26
# - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
27
# - $3 action-if-found : add value to shellvariable
28
# - $4 action-if-not-found : nothing
30
# note: in earlier versions, $1-$2 were swapped. We try to detect the
31
# situation and accept a $2=~/-/ as being the old
32
# option-to-check-for.
34
# also: there are other variants that emerged from the original macro
35
# variant which did just test an option to be possibly added.
36
# However, some compilers accept an option silently, or possibly for
37
# just another option that was not intended. Therefore, we have to do
38
# a generic test for a compiler family. For gcc we check "-pedantic"
39
# being accepted which is also understood by compilers who just want
40
# to be compatible with gcc even when not being made from gcc
45
# AX_CFLAGS_SUN_OPTION AX_CFLAGS_HPUX_OPTION
46
# AX_CFLAGS_AIX_OPTION AX_CFLAGS_IRIX_OPTION
54
# Copyright (c) 2006 Guido U. Draheim <guidod@gmx.de>
56
# This program is free software; you can redistribute it and/or
57
# modify it under the terms of the GNU General Public License as
58
# published by the Free Software Foundation; either version 2 of the
59
# License, or (at your option) any later version.
61
# This program is distributed in the hope that it will be useful, but
62
# WITHOUT ANY WARRANTY; without even the implied warranty of
63
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
64
# General Public License for more details.
66
# You should have received a copy of the GNU General Public License
67
# along with this program; if not, write to the Free Software
68
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
71
# As a special exception, the respective Autoconf Macro's copyright
72
# owner gives unlimited permission to copy, distribute and modify the
73
# configure scripts that are the output of Autoconf when processing
74
# the Macro. You need not follow the terms of the GNU General Public
75
# License when using or distributing such scripts, even though
76
# portions of the text of the Macro appear in them. The GNU General
77
# Public License (GPL) does govern all other use of the material that
78
# constitutes the Autoconf Macro.
80
# This special exception to the GPL applies to versions of the
81
# Autoconf Macro released by the Autoconf Macro Archive. When you
82
# make and distribute a modified version of the Autoconf Macro, you
83
# may extend this special exception to the GPL to apply to your
84
# modified version as well.
86
AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
87
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
88
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
89
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
90
VAR,[VAR="no, unknown"
93
ac_save_[]FLAGS="$[]FLAGS"
95
in "-pedantic % m4_ifval($2,$2,-option)" dnl GCC
97
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
98
AC_TRY_COMPILE([],[return 0;],
99
[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
101
FLAGS="$ac_save_[]FLAGS"
105
.ok|.ok,*) m4_ifvaln($3,$3) ;;
106
.|.no|.no,*) m4_ifvaln($4,$4) ;;
108
if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
109
then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
110
else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
111
m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
114
AS_VAR_POPDEF([VAR])dnl
115
AS_VAR_POPDEF([FLAGS])dnl
119
dnl the only difference - the LANG selection... and the default FLAGS
121
AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
122
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
123
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
124
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
125
VAR,[VAR="no, unknown"
128
ac_save_[]FLAGS="$[]FLAGS"
130
in "-pedantic % m4_ifval($2,$2,-option)" dnl GCC
132
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
133
AC_TRY_COMPILE([],[return 0;],
134
[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
136
FLAGS="$ac_save_[]FLAGS"
140
.ok|.ok,*) m4_ifvaln($3,$3) ;;
141
.|.no|.no,*) m4_ifvaln($4,$4) ;;
143
if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
144
then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
145
else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
146
m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
149
AS_VAR_POPDEF([VAR])dnl
150
AS_VAR_POPDEF([FLAGS])dnl
153
dnl -------------------------------------------------------------------------
155
AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
156
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
157
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
158
AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
159
VAR,[VAR="no, unknown"
162
ac_save_[]FLAGS="$[]FLAGS"
164
in "-pedantic % m4_ifval($1,$1,-option)" dnl GCC
166
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
167
AC_TRY_COMPILE([],[return 0;],
168
[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
170
FLAGS="$ac_save_[]FLAGS"
174
.ok|.ok,*) m4_ifvaln($3,$3) ;;
175
.|.no|.no,*) m4_ifvaln($4,$4) ;;
177
if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
178
then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
179
else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
180
m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
183
AS_VAR_POPDEF([VAR])dnl
184
AS_VAR_POPDEF([FLAGS])dnl
188
dnl the only difference - the LANG selection... and the default FLAGS
190
AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
191
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
192
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
193
AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
194
VAR,[VAR="no, unknown"
197
ac_save_[]FLAGS="$[]FLAGS"
199
in "-pedantic % m4_ifval($1,$1,-option)" dnl GCC
201
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
202
AC_TRY_COMPILE([],[return 0;],
203
[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
205
FLAGS="$ac_save_[]FLAGS"
209
.ok|.ok,*) m4_ifvaln($3,$3) ;;
210
.|.no|.no,*) m4_ifvaln($4,$4) ;;
212
if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
213
then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
214
else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
215
m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
218
AS_VAR_POPDEF([VAR])dnl
219
AS_VAR_POPDEF([FLAGS])dnl
222
AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
223
[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])
225
AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
226
[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])
added
removed
sigscheme/m4/ax_cflags_gcc_option.m4
