1 dnl Macros used to build the Wine configure script
3 dnl Copyright 2002 Alexandre Julliard
5 dnl This library is free software; you can redistribute it and/or
6 dnl modify it under the terms of the GNU Lesser General Public
7 dnl License as published by the Free Software Foundation; either
8 dnl version 2.1 of the License, or (at your option) any later version.
10 dnl This library is distributed in the hope that it will be useful,
11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 dnl Lesser General Public License for more details.
15 dnl You should have received a copy of the GNU Lesser General Public
16 dnl License along with this library; if not, write to the Free Software
17 dnl Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 dnl As a special exception to the GNU Lesser General Public License,
20 dnl if you distribute this file as part of a program that contains a
21 dnl configuration script generated by Autoconf, you may include it
22 dnl under the same distribution terms that you use for the rest of
25 dnl WINE_CHECK_HOST_TOOL(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH])
27 dnl Like AC_CHECK_TOOL but without the broken fallback to non-prefixed name
29 AC_DEFUN([WINE_CHECK_HOST_TOOL],
30 [AS_VAR_SET_IF([ac_tool_prefix],
31 [AC_CHECK_PROG([$1],[${ac_tool_prefix}$2],[${ac_tool_prefix}$2],,[$4])])
32 AS_VAR_IF([ac_cv_prog_$1],[],
33 [AS_VAR_IF([cross_compiling],[yes],[],
34 [AS_UNSET([ac_cv_prog_$1])
35 AC_CHECK_PROG([$1],[$2],[$2],[$3],[$4])])],
36 [AS_VAR_COPY([$1],[ac_cv_prog_$1])])])
38 dnl WINE_HEADER_MAJOR()
40 dnl Same as AC_HEADER_MAJOR but fixed to handle the glibc 2.25 sys/types.h breakage
42 AC_DEFUN([WINE_HEADER_MAJOR],
43 [AC_CHECK_HEADER(sys/mkdev.h,
44 [AC_DEFINE(MAJOR_IN_MKDEV, 1,
45 [Define to 1 if `major', `minor', and `makedev' are
46 declared in <mkdev.h>.])])
47 if test $ac_cv_header_sys_mkdev_h = no; then
48 AC_CHECK_HEADER(sys/sysmacros.h,
49 [AC_DEFINE(MAJOR_IN_SYSMACROS, 1,
50 [Define to 1 if `major', `minor', and `makedev'
51 are declared in <sysmacros.h>.])])
54 dnl **** Initialize the programs used by other checks ****
56 dnl Usage: WINE_PATH_SONAME_TOOLS
57 dnl Usage: WINE_PATH_PKG_CONFIG
59 AC_DEFUN([WINE_PATH_SONAME_TOOLS],
60 [AC_PATH_PROG(LDD,ldd,true,/sbin:/usr/sbin:$PATH)
61 AC_CHECK_TOOL(OTOOL,otool,otool)
62 AC_CHECK_TOOL(READELF,[readelf],true)])
64 AC_DEFUN([WINE_PATH_PKG_CONFIG],
65 [WINE_CHECK_HOST_TOOL(PKG_CONFIG,[pkg-config])])
67 AC_DEFUN([WINE_PATH_MINGW_PKG_CONFIG],
70 ac_prefix_list="m4_foreach([ac_wine_cpu],[i686,i586,i486,i386],[ac_wine_cpu-w64-mingw32-pkg-config ])" ;;
72 ac_prefix_list="$host_cpu-w64-mingw32-pkg-config" ;;
74 AC_CHECK_PROGS(MINGW_PKG_CONFIG,[$ac_prefix_list],false)])
76 dnl **** Extract the soname of a library ****
78 dnl Usage: WINE_CHECK_SONAME(library, function, [action-if-found, [action-if-not-found, [other_libraries, [pattern]]]])
80 AC_DEFUN([WINE_CHECK_SONAME],
81 [AC_REQUIRE([WINE_PATH_SONAME_TOOLS])dnl
82 AS_VAR_PUSHDEF([ac_Lib],[ac_cv_lib_soname_$1])dnl
83 m4_pushdef([ac_lib_pattern],m4_default([$6],[lib$1]))dnl
84 AC_MSG_CHECKING([for -l$1])
86 [ac_check_soname_save_LIBS=$LIBS
88 AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
90 dll) AS_VAR_SET(ac_Lib,[`$ac_cv_path_LDD conftest.exe | grep "$1" | sed -e "s/dll.*/dll/"';2,$d'`]) ;;
91 dylib) AS_VAR_SET(ac_Lib,[`$OTOOL -L conftest$ac_exeext | grep "ac_lib_pattern\\.[[0-9A-Za-z.]]*dylib" | sed -e "s/^.*\/\(ac_lib_pattern\.[[0-9A-Za-z.]]*dylib\).*$/\1/"';2,$d'`]) ;;
92 *) AS_VAR_SET(ac_Lib,[`$READELF -d conftest$ac_exeext | grep "NEEDED.*ac_lib_pattern\\.$LIBEXT" | sed -e "s/^.*\\m4_dquote(\\(ac_lib_pattern\\.$LIBEXT[[^ ]]*\\)\\).*$/\1/"';2,$d'`])
93 AS_VAR_IF([ac_Lib],[],
94 [AS_VAR_SET(ac_Lib,[`$LDD conftest$ac_exeext | grep "ac_lib_pattern\\.$LIBEXT" | sed -e "s/^.*\(ac_lib_pattern\.$LIBEXT[[^ ]]*\).*$/\1/"';2,$d'`])]) ;;
96 [AS_VAR_SET(ac_Lib,[])])
97 LIBS=$ac_check_soname_save_LIBS])dnl
98 AS_VAR_IF([ac_Lib],[],
99 [AC_MSG_RESULT([not found])
101 [AC_MSG_RESULT(AS_VAR_GET(ac_Lib))
102 AC_DEFINE_UNQUOTED(AS_TR_CPP(SONAME_LIB$1),["]AS_VAR_GET(ac_Lib)["],
103 [Define to the soname of the lib$1 library.])
105 m4_popdef([ac_lib_pattern])dnl
106 AS_VAR_POPDEF([ac_Lib])])
108 dnl **** Get flags from pkg-config or alternate xxx-config program ****
110 dnl Usage: WINE_PACKAGE_FLAGS(var,pkg-name,[default-lib,[cflags-alternate,libs-alternate,[checks]]])
112 AC_DEFUN([WINE_PACKAGE_FLAGS],
113 [AC_REQUIRE([WINE_PATH_PKG_CONFIG])dnl
114 AS_VAR_PUSHDEF([ac_cflags],[[$1]_CFLAGS])dnl
115 AS_VAR_PUSHDEF([ac_libs],[[$1]_LIBS])dnl
116 AC_ARG_VAR(ac_cflags, [C compiler flags for $2, overriding pkg-config])dnl
117 AS_VAR_IF([ac_cflags],[],
118 [AS_VAR_SET_IF([PKG_CONFIG],
119 [ac_cflags=`$PKG_CONFIG --cflags [$2] 2>/dev/null`])])
120 m4_ifval([$4],[test "$cross_compiling" = yes || ac_cflags=[$]{ac_cflags:-[$4]}])
121 AC_ARG_VAR(ac_libs, [Linker flags for $2, overriding pkg-config])dnl
122 AS_VAR_IF([ac_libs],[],
123 [AS_VAR_SET_IF([PKG_CONFIG],
124 [ac_libs=`$PKG_CONFIG --libs [$2] 2>/dev/null`])])
125 m4_ifval([$5],[test "$cross_compiling" = yes || ac_libs=[$]{ac_libs:-[$5]}])
126 m4_ifval([$3],[ac_libs=[$]{ac_libs:-"$3"}])
127 AS_ECHO(["$as_me:${as_lineno-$LINENO}: $2 cflags: $ac_cflags"]) >&AS_MESSAGE_LOG_FD
128 AS_ECHO(["$as_me:${as_lineno-$LINENO}: $2 libs: $ac_libs"]) >&AS_MESSAGE_LOG_FD
129 ac_save_CPPFLAGS=$CPPFLAGS
130 CPPFLAGS="$CPPFLAGS $ac_cflags"
132 CPPFLAGS=$ac_save_CPPFLAGS
133 AS_VAR_POPDEF([ac_libs])dnl
134 AS_VAR_POPDEF([ac_cflags])])dnl
136 dnl **** Get flags from MinGW pkg-config or alternate xxx-config program ****
138 dnl Usage: WINE_MINGW_PACKAGE_FLAGS(var,pkg-name,[default-lib,[checks]])
140 AC_DEFUN([WINE_MINGW_PACKAGE_FLAGS],
141 [AC_REQUIRE([WINE_PATH_MINGW_PKG_CONFIG])dnl
142 AS_VAR_PUSHDEF([ac_cflags],[[$1]_PE_CFLAGS])dnl
143 AS_VAR_PUSHDEF([ac_libs],[[$1]_PE_LIBS])dnl
144 AS_VAR_IF([ac_cflags],[],
145 [AS_VAR_SET_IF([MINGW_PKG_CONFIG],
146 [ac_cflags=`$MINGW_PKG_CONFIG --cflags [$2] 2>/dev/null`])])
147 AS_VAR_IF([ac_libs],[],
148 [AS_VAR_SET_IF([MINGW_PKG_CONFIG],
149 [ac_libs=`$MINGW_PKG_CONFIG --libs [$2] 2>/dev/null`])])
150 m4_ifval([$3],[ac_libs=[$]{ac_libs:-"$3"}])
151 ac_save_CPPFLAGS=$CPPFLAGS
152 CPPFLAGS="$CPPFLAGS $ac_cflags"
154 CPPFLAGS=$ac_save_CPPFLAGS
155 AS_VAR_POPDEF([ac_libs])dnl
156 AS_VAR_POPDEF([ac_cflags])])dnl
158 dnl **** Get flags for an external lib program ****
160 dnl Usage: WINE_EXTLIB_FLAGS(var,pkg-name,default-libs,default-cflags)
162 AC_DEFUN([WINE_EXTLIB_FLAGS],
163 [AS_VAR_PUSHDEF([ac_cflags],[[$1]_PE_CFLAGS])dnl
164 AS_VAR_PUSHDEF([ac_libs],[[$1]_PE_LIBS])dnl
165 AC_ARG_VAR(ac_cflags, [C compiler flags for the PE $2, overriding the bundled version])dnl
166 AC_ARG_VAR(ac_libs, [Linker flags for the PE $2, overriding the bundled version])dnl
167 AS_VAR_IF([ac_libs],[],
169 AS_VAR_IF([ac_cflags],[],[ac_cflags=$4],[enable_$2=no])],
171 AS_ECHO(["$as_me:${as_lineno-$LINENO}: $2 cflags: $ac_cflags"]) >&AS_MESSAGE_LOG_FD
172 AS_ECHO(["$as_me:${as_lineno-$LINENO}: $2 libs: $ac_libs"]) >&AS_MESSAGE_LOG_FD
173 AS_VAR_POPDEF([ac_libs])dnl
174 AS_VAR_POPDEF([ac_cflags])])dnl
176 dnl **** Link C code with an assembly file ****
178 dnl Usage: WINE_TRY_ASM_LINK(asm-code,includes,function,[action-if-found,[action-if-not-found]])
180 AC_DEFUN([WINE_TRY_ASM_LINK],
181 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[$2]],[[asm($1); $3]])],[$4],[$5])])
183 dnl **** Check if we can link an empty program with special CFLAGS ****
185 dnl Usage: WINE_TRY_CFLAGS(flags,[action-if-yes,[action-if-no]])
187 dnl The default action-if-yes is to append the flags to EXTRACFLAGS.
189 AC_DEFUN([WINE_TRY_CFLAGS],
190 [AS_VAR_PUSHDEF([ac_var], ac_cv_cflags_[[$1]])dnl
191 AC_CACHE_CHECK([whether the compiler supports $1], ac_var,
192 [ac_wine_try_cflags_saved=$CFLAGS
194 AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(int argc, char **argv) { return 0; }]])],
195 [AS_VAR_SET(ac_var,yes)], [AS_VAR_SET(ac_var,no)])
196 CFLAGS=$ac_wine_try_cflags_saved])
197 AS_VAR_IF([ac_var],[yes],[m4_default([$2], [EXTRACFLAGS="$EXTRACFLAGS $1"])], [$3])dnl
198 AS_VAR_POPDEF([ac_var])])
200 dnl **** Check if we can link an empty program with special CFLAGS ****
202 dnl Usage: WINE_TRY_CROSSCFLAGS(flags,[action-if-yes,[action-if-no]])
204 dnl The default action-if-yes is to append the flags to EXTRACROSSCFLAGS.
206 AC_DEFUN([WINE_TRY_CROSSCFLAGS],
207 [AS_VAR_PUSHDEF([ac_var], ac_cv_crosscflags_[[$1]])dnl
208 AC_CACHE_CHECK([whether the cross-compiler supports $1], ac_var,
209 [ac_wine_try_cflags_saved=$CFLAGS
210 ac_wine_try_cflags_saved_cc=$CC
211 ac_wine_try_cflags_saved_exeext=$ac_exeext
212 CFLAGS="$CFLAGS $EXTRACROSSCFLAGS -nostartfiles -nodefaultlibs $1"
215 AC_LINK_IFELSE([AC_LANG_SOURCE([[int __cdecl mainCRTStartup(void) { return 0; }]])],
216 [AS_VAR_SET(ac_var,yes)], [AS_VAR_SET(ac_var,no)])
217 CFLAGS=$ac_wine_try_cflags_saved
218 CC=$ac_wine_try_cflags_saved_cc
219 ac_exeext=$ac_wine_try_cflags_saved_exeext])
220 AS_VAR_IF([ac_var],[yes],[m4_default([$2], [EXTRACROSSCFLAGS="$EXTRACROSSCFLAGS $1"])], [$3])dnl
221 AS_VAR_POPDEF([ac_var])])
223 dnl **** Check whether the given MinGW header is available ****
225 dnl Usage: WINE_CHECK_MINGW_HEADER(header,[action-if-found],[action-if-not-found],[other-includes])
227 AC_DEFUN([WINE_CHECK_MINGW_HEADER],
228 [AS_VAR_PUSHDEF([ac_var],[ac_cv_mingw_header_$1])dnl
229 AC_CACHE_CHECK([for MinGW $1], ac_var,
230 [ac_wine_check_headers_saved_cc=$CC
231 ac_wine_check_headers_saved_exeext=$ac_exeext
234 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[$4
235 #include <$1>]])],[AS_VAR_SET([ac_var],[yes])],[AS_VAR_SET([ac_var],[no])])
236 CC=$ac_wine_check_headers_saved_cc
237 ac_exeext=$ac_wine_check_headers_saved_exeext])
238 AS_VAR_IF([ac_var],[yes],[$2],[$3])dnl
239 AS_VAR_POPDEF([ac_var])])
241 dnl **** Check whether the given MinGW library is available ****
243 dnl Usage: WINE_CHECK_MINGW_LIB(library,function,[action-if-found],[action-if-not-found],[other-libraries])
245 AC_DEFUN([WINE_CHECK_MINGW_LIB],
246 [AS_VAR_PUSHDEF([ac_var],[ac_cv_mingw_lib_$1])dnl
247 AC_CACHE_CHECK([for $2 in MinGW -l$1], ac_var,
248 [ac_wine_check_headers_saved_cc=$CC
249 ac_wine_check_headers_saved_exeext=$ac_exeext
250 ac_wine_check_headers_saved_libs=$LIBS
254 AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],[AS_VAR_SET([ac_var],[yes])],[AS_VAR_SET([ac_var],[no])])
255 CC=$ac_wine_check_headers_saved_cc
256 ac_exeext=$ac_wine_check_headers_saved_exeext
257 LIBS=$ac_wine_check_headers_saved_libs])
258 AS_VAR_IF([ac_var],[yes],[$3],[$4])dnl
259 AS_VAR_POPDEF([ac_var])])
261 dnl **** Check if we can link an empty shared lib (no main) with special CFLAGS ****
263 dnl Usage: WINE_TRY_SHLIB_FLAGS(flags,[action-if-yes,[action-if-no]])
265 AC_DEFUN([WINE_TRY_SHLIB_FLAGS],
266 [AS_VAR_PUSHDEF([ac_var], ac_cv_cflags_[[$1]])dnl
267 ac_wine_try_cflags_saved=$CFLAGS
269 AC_LINK_IFELSE([AC_LANG_SOURCE([[void myfunc() {}]])],
270 [AS_VAR_SET(ac_var,yes)], [AS_VAR_SET(ac_var,no)])
271 CFLAGS=$ac_wine_try_cflags_saved
272 AS_VAR_IF([ac_var],[yes], [$2], [$3])dnl
273 AS_VAR_POPDEF([ac_var])])
275 dnl **** Check whether we need to define a symbol on the compiler command line ****
277 dnl Usage: WINE_CHECK_DEFINE(name),[action-if-yes,[action-if-no]])
279 AC_DEFUN([WINE_CHECK_DEFINE],
280 [AS_VAR_PUSHDEF([ac_var],[ac_cv_cpp_def_$1])dnl
281 AC_CACHE_CHECK([whether we need to define $1],ac_var,
282 AC_EGREP_CPP(yes,[#ifndef $1
285 [AS_VAR_SET(ac_var,yes)],[AS_VAR_SET(ac_var,no)]))
286 AS_VAR_IF([ac_var],[yes],
287 [CFLAGS="$CFLAGS -D$1"
288 LINTFLAGS="$LINTFLAGS -D$1"])dnl
289 AS_VAR_POPDEF([ac_var])])
291 dnl **** Check for functions with some extra libraries ****
293 dnl Usage: WINE_CHECK_LIB_FUNCS(funcs,libs,[action-if-found,[action-if-not-found]])
295 AC_DEFUN([WINE_CHECK_LIB_FUNCS],
296 [ac_wine_check_funcs_save_LIBS="$LIBS"
298 AC_CHECK_FUNCS([$1],[$3],[$4])
299 LIBS="$ac_wine_check_funcs_save_LIBS"])
301 dnl **** Check for a mingw program, trying the various mingw prefixes ****
303 dnl Usage: WINE_CHECK_MINGW_PROG(variable,[value-if-not-found],[path])
305 AC_DEFUN([WINE_CHECK_MINGW_PROG],
308 ac_prefix_list="aarch64-w64-mingw32-clang aarch64-w64-mingw32-gcc clang" ;;
310 ac_prefix_list="armv7-w64-mingw32-clang armv7-w64-mingw32-gcc clang" ;;
312 ac_prefix_list="m4_foreach([ac_wine_prefix],[w64-mingw32, pc-mingw32, mingw32msvc, mingw32],
313 m4_foreach([ac_wine_cpu],[i686,i586,i486,i386],[ac_wine_cpu-ac_wine_prefix-gcc ]))
314 m4_foreach([ac_wine_cpu],[i686,i586,i486,i386],[ac_wine_cpu-w64-mingw32-clang ])
315 mingw32-gcc clang" ;;
317 ac_prefix_list="m4_foreach([ac_wine_prefix],[pc-mingw32, w64-mingw32, mingw32msvc],
318 m4_foreach([ac_wine_cpu],[x86_64,amd64],[ac_wine_cpu-ac_wine_prefix-gcc ]))
319 m4_foreach([ac_wine_cpu],[x86_64,amd64],[ac_wine_cpu-w64-mingw32-clang ]) clang" ;;
323 AC_CHECK_PROGS([$1],[$ac_prefix_list],[$2],[$3])])
326 dnl **** Define helper functions for creating config.status files ****
328 dnl Usage: AC_REQUIRE([WINE_CONFIG_HELPERS])
330 AC_DEFUN([WINE_CONFIG_HELPERS],
331 [AS_VAR_SET([wine_rules],["all:"])
333 AC_SUBST(DISABLED_SUBDIRS,"")
334 AC_SUBST(CONFIGURE_TARGETS,"")
336 wine_fn_append_file ()
338 AS_VAR_APPEND($[1]," \\$as_nl $[2]")
341 wine_fn_append_rule ()
343 AS_VAR_APPEND(wine_rules,"$as_nl$[1]")
346 wine_fn_config_makefile ()
348 wine_fn_append_file SUBDIRS $[1]
349 AS_VAR_IF([$[2]],[no],[wine_fn_append_file DISABLED_SUBDIRS $[1]])
352 wine_fn_config_symlink ()
355 wine_fn_append_rule \
357 @./config.status \$[@]"
358 for f in $ac_links; do wine_fn_append_file CONFIGURE_TARGETS $f; done
361 dnl **** Define helper function to append a rule to a makefile command list ****
363 dnl Usage: WINE_APPEND_RULE(rule)
365 AC_DEFUN([WINE_APPEND_RULE],[AC_REQUIRE([WINE_CONFIG_HELPERS])wine_fn_append_rule "$1"])
367 dnl **** Create symlinks from config.status ****
369 dnl Usage: WINE_CONFIG_SYMLINK(target,src,enable)
371 AC_DEFUN([WINE_CONFIG_SYMLINK],[AC_REQUIRE([WINE_CONFIG_HELPERS])dnl
372 m4_ifval([$3],[if test $3; then
373 ])AC_CONFIG_LINKS([$1:$2])dnl
374 wine_fn_config_symlink[ $1]m4_ifval([$3],[
378 dnl **** Create a makefile from config.status ****
380 dnl Usage: WINE_CONFIG_MAKEFILE(file,enable,condition)
382 AC_DEFUN([WINE_CONFIG_MAKEFILE],[AC_REQUIRE([WINE_CONFIG_HELPERS])dnl
383 AS_VAR_PUSHDEF([ac_enable],m4_default([$2],[enable_]m4_bpatsubst([$1],[.*/\([^/]*\)$],[\1])))dnl
384 m4_append_uniq([_AC_USER_OPTS],ac_enable,[
386 m4_ifval([$3],[$3 || ])wine_fn_config_makefile [$1] ac_enable[]dnl
387 AS_VAR_POPDEF([ac_enable])])
389 dnl **** Append a file to the .gitignore list ****
391 dnl Usage: WINE_IGNORE_FILE(file,enable)
393 AC_DEFUN([WINE_IGNORE_FILE],[AC_REQUIRE([WINE_CONFIG_HELPERS])dnl
394 m4_ifval([$2],[test "x$[$2]" = xno || ])wine_fn_append_file CONFIGURE_TARGETS $1])
396 dnl **** Add a message to the list displayed at the end ****
398 dnl Usage: WINE_NOTICE(notice)
399 dnl Usage: WINE_WARNING(warning)
400 dnl Usage: WINE_NOTICE_WITH(with_flag, test, notice, enable)
401 dnl Usage: WINE_WARNING_WITH(with_flag, test, warning, enable)
402 dnl Usage: WINE_ERROR_WITH(with_flag, test, error, enable)
403 dnl Usage: WINE_PRINT_MESSAGES
405 AC_DEFUN([WINE_NOTICE],[AS_VAR_APPEND([wine_notices],["|$1"])])
406 AC_DEFUN([WINE_WARNING],[AS_VAR_APPEND([wine_warnings],["|$1"])])
408 AC_DEFUN([WINE_NOTICE_WITH],[AS_IF([$2],[case "x$with_$1" in
409 x) WINE_NOTICE([$3]) ;;
412 This is an error since --with-$1 was requested.]) ;;
414 m4_ifval([$4],[$4=${$4:-no}])])])
416 AC_DEFUN([WINE_WARNING_WITH],[AS_IF([$2],[case "x$with_$1" in
417 x) WINE_WARNING([$3]) ;;
420 This is an error since --with-$1 was requested.]) ;;
422 m4_ifval([$4],[$4=${$4:-no}])])])
424 AC_DEFUN([WINE_ERROR_WITH],[AS_IF([$2],[case "x$with_$1" in
427 Use the --without-$1 option if you really want this.]) ;;
429 m4_ifval([$4],[$4=${$4:-no}])])])
431 AC_DEFUN([WINE_PRINT_MESSAGES],[ac_save_IFS="$IFS"
432 if test "x$wine_notices" != x; then
435 for msg in $wine_notices; do
437 AS_VAR_IF([msg],[],,[AC_MSG_NOTICE([$msg])])
441 for msg in $wine_warnings; do
443 AS_VAR_IF([msg],[],,[echo >&2
444 AC_MSG_WARN([$msg])])
449 dnl compile-command: "autoreconf --warnings=all"