[thirdparty/lldpd.git] / m4 / ax_cflags_gcc_option.m4

# ===========================================================================
#          http://autoconf-archive.cryp.to/ax_cflags_gcc_option.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
#
# DESCRIPTION
#
#   AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
#   "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the optionflag
#   to CFLAGS if it is understood. You can override the shellvar-default of
#   CFLAGS of course. The order of arguments stems from the explicit macros
#   like AX_CFLAGS_WARN_ALL.
#
#   The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add to
#   CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it
#   is possible to use different compilers for C and C++).
#
#   The macro is a lot simpler than any special AX_CFLAGS_* macro (or
#   ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
#   However, if you use this macro in a few places, it would be great if you
#   would make up a new function-macro and submit it to the ac-archive.
#
#     - $1 option-to-check-for : required ("-option" as non-value)
#     - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
#     - $3 action-if-found : add value to shellvariable
#     - $4 action-if-not-found : nothing
#
#   Note: in earlier versions, $1-$2 were swapped. We try to detect the
#   situation and accept a $2=~/-/ as being the old option-to-check-for.
#
#   There are other variants that emerged from the original macro variant
#   which did just test an option to be possibly added. However, some
#   compilers accept an option silently, or possibly for just another option
#   that was not intended. Therefore, we have to do a generic test for a
#   compiler family. For gcc we check "-pedantic" being accepted which is
#   also understood by compilers who just want to be compatible with gcc
#   even when not being made from gcc sources.
#
#   See also: AX_CFLAGS_SUN_OPTION, AX_CFLAGS_HPUX_OPTION,
#   AX_CFLAGS_AIX_OPTION, and AX_CFLAGS_IRIX_OPTION.
#
# LICENSE
#
#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
#   This program is free software; you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation; either version 2 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
VAR,[AS_VAR_SET([VAR], ["no, unknown"])
 AC_LANG_SAVE
 AC_LANG_C
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic -Werror % m4_ifval($2,$2,-option)"  dnl   GCC
   "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete"  dnl new GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_TRY_COMPILE([],[return 0;],
   [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]) ; break])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
AS_VAR_COPY([ac_res], [VAR])
case ".${ac_res}" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " ${ac_res} " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain ${ac_res}])
   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])


dnl the only difference - the LANG selection... and the default FLAGS

AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
VAR,[AS_VAR_SET([VAR],["no, unknown"])
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic -Werror % m4_ifval($2,$2,-option)"  dnl   GCC
   "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete"  dnl new GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_TRY_COMPILE([],[return 0;],
   [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]) ; break])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
AS_VAR_COPY([ac_res], [VAR])
case ".${ac_res}" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " ${VAR} " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain ${ac_res}])
   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])

dnl -------------------------------------------------------------------------

AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
VAR,[AS_VAR_SET([VAR],["no, unknown"])
 AC_LANG_SAVE
 AC_LANG_C
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic -Werror % m4_ifval($1,$1,-option)"  dnl   GCC
   "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete"  dnl new GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_TRY_COMPILE([],[return 0;],
   [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]) ; break])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
AS_VAR_COPY([ac_res], [VAR])
case ".${ac_res}" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " ${ac_res} " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain ${ac_res}])
   else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"])
                      m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])


dnl the only difference - the LANG selection... and the default FLAGS

AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
VAR,[AS_VAR_SET([VAR],["no, unknown"])
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic -Werror % m4_ifval($1,$1,-option)"  dnl   GCC
   "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete"  dnl new GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_TRY_COMPILE([],[return 0;],
   [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]) ; break])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
AS_VAR_COPY([ac_res], [VAR])
case ".${ac_res}" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " ${ac_res} " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain ${ac_res}])
   else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"])
                      m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])

AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])

AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])
Commit	Line	Data
45e89c8c VB	1	# ===========================================================================
	2	# http://autoconf-archive.cryp.to/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	# ac_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	AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
76	AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
77	AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
78	AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
afcb570e	79	VAR,[AS_VAR_SET([VAR], ["no, unknown"])
45e89c8c VB	80	AC_LANG_SAVE
	81	AC_LANG_C
	82	ac_save_[]FLAGS="$[]FLAGS"
	83	for ac_arg dnl
	84	in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC
	85	"-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC
	86	#
	87	do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg \| sed -e 's,%%.*,,' -e 's,%,,'`
	88	AC_TRY_COMPILE([],[return 0;],
afcb570e	89	[AS_VAR_SET([VAR],[`echo $ac_arg \| sed -e 's,.% ,,'`]) ; break])
45e89c8c VB	90	done
	91	FLAGS="$ac_save_[]FLAGS"
	92	AC_LANG_RESTORE
	93	])
afcb570e VB	94	AS_VAR_COPY([ac_res], [VAR])
afcb570e VB	95	case ".${ac_res}" in
45e89c8c VB	96	.ok\|.ok,*) m4_ifvaln($3,$3) ;;
	97	.\|.no\|.no,*) m4_ifvaln($4,$4) ;;
	98	*) m4_ifvaln($3,$3,[
afcb570e VB	99	if echo " $[]m4_ifval($1,$1,FLAGS) " \| grep " ${ac_res} " 2>&1 >/dev/null
	100	then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain ${ac_res}])
	101	else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"])
	102	m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"
45e89c8c VB	103	fi ]) ;;
	104	esac
	105	AS_VAR_POPDEF([VAR])dnl
	106	AS_VAR_POPDEF([FLAGS])dnl
	107	])
	108
	109
	110	dnl the only difference - the LANG selection... and the default FLAGS
	111
	112	AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
	113	AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
	114	AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
	115	AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
afcb570e	116	VAR,[AS_VAR_SET([VAR],["no, unknown"])
45e89c8c VB	117	AC_LANG_SAVE
	118	AC_LANG_CPLUSPLUS
	119	ac_save_[]FLAGS="$[]FLAGS"
	120	for ac_arg dnl
	121	in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC
	122	"-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC
	123	#
	124	do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg \| sed -e 's,%%.*,,' -e 's,%,,'`
	125	AC_TRY_COMPILE([],[return 0;],
afcb570e	126	[AS_VAR_SET([VAR],[`echo $ac_arg \| sed -e 's,.% ,,'`]) ; break])
45e89c8c VB	127	done
	128	FLAGS="$ac_save_[]FLAGS"
	129	AC_LANG_RESTORE
	130	])
afcb570e VB	131	AS_VAR_COPY([ac_res], [VAR])
afcb570e VB	132	case ".${ac_res}" in
45e89c8c VB	133	.ok\|.ok,*) m4_ifvaln($3,$3) ;;
	134	.\|.no\|.no,*) m4_ifvaln($4,$4) ;;
	135	*) m4_ifvaln($3,$3,[
afcb570e VB	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 ${ac_res}])
	138	else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"])
	139	m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) ${ac_res}"
45e89c8c VB	140	fi ]) ;;
	141	esac
	142	AS_VAR_POPDEF([VAR])dnl
	143	AS_VAR_POPDEF([FLAGS])dnl
	144	])
	145
	146	dnl -------------------------------------------------------------------------
	147
	148	AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
	149	AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
	150	AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
	151	AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
afcb570e	152	VAR,[AS_VAR_SET([VAR],["no, unknown"])
45e89c8c VB	153	AC_LANG_SAVE
	154	AC_LANG_C
	155	ac_save_[]FLAGS="$[]FLAGS"
	156	for ac_arg dnl
	157	in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC
	158	"-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC
	159	#
	160	do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg \| sed -e 's,%%.*,,' -e 's,%,,'`
	161	AC_TRY_COMPILE([],[return 0;],
afcb570e	162	[AS_VAR_SET([VAR],[`echo $ac_arg \| sed -e 's,.% ,,'`]) ; break])
45e89c8c VB	163	done
	164	FLAGS="$ac_save_[]FLAGS"
	165	AC_LANG_RESTORE
	166	])
afcb570e VB	167	AS_VAR_COPY([ac_res], [VAR])
afcb570e VB	168	case ".${ac_res}" in
45e89c8c VB	169	.ok\|.ok,*) m4_ifvaln($3,$3) ;;
	170	.\|.no\|.no,*) m4_ifvaln($4,$4) ;;
	171	*) m4_ifvaln($3,$3,[
afcb570e VB	172	if echo " $[]m4_ifval($2,$2,FLAGS) " \| grep " ${ac_res} " 2>&1 >/dev/null
	173	then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain ${ac_res}])
	174	else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"])
	175	m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"
45e89c8c VB	176	fi ]) ;;
	177	esac
	178	AS_VAR_POPDEF([VAR])dnl
	179	AS_VAR_POPDEF([FLAGS])dnl
	180	])
	181
	182
	183	dnl the only difference - the LANG selection... and the default FLAGS
	184
	185	AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
	186	AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
	187	AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
	188	AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
afcb570e	189	VAR,[AS_VAR_SET([VAR],["no, unknown"])
45e89c8c VB	190	AC_LANG_SAVE
	191	AC_LANG_CPLUSPLUS
	192	ac_save_[]FLAGS="$[]FLAGS"
	193	for ac_arg dnl
	194	in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC
	195	"-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC
	196	#
	197	do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg \| sed -e 's,%%.*,,' -e 's,%,,'`
	198	AC_TRY_COMPILE([],[return 0;],
afcb570e	199	[AS_VAR_SET([VAR],[`echo $ac_arg \| sed -e 's,.% ,,'`]) ; break])
45e89c8c VB	200	done
	201	FLAGS="$ac_save_[]FLAGS"
	202	AC_LANG_RESTORE
	203	])
afcb570e VB	204	AS_VAR_COPY([ac_res], [VAR])
afcb570e VB	205	case ".${ac_res}" in
45e89c8c VB	206	.ok\|.ok,*) m4_ifvaln($3,$3) ;;
	207	.\|.no\|.no,*) m4_ifvaln($4,$4) ;;
	208	*) m4_ifvaln($3,$3,[
afcb570e VB	209	if echo " $[]m4_ifval($2,$2,FLAGS) " \| grep " ${ac_res} " 2>&1 >/dev/null
	210	then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain ${ac_res}])
	211	else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"])
	212	m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) ${ac_res}"
45e89c8c VB	213	fi ]) ;;
	214	esac
	215	AS_VAR_POPDEF([VAR])dnl
	216	AS_VAR_POPDEF([FLAGS])dnl
	217	])
	218
	219	AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
	220	[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])
	221
	222	AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
	223	[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])