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comparison configure.ac @ 1088:f2a3570b5110

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Test struct existance against sizeof() operator Instead of declaring an "unused-variable" or "unused-but-set-variable" structure. This avoid unexpected broken configurations when using something like: $ ./configure CFLAGS="-Wall -Wextra -Werror" It causes AC_COMPILE_IFELSE to fail and thus leading to a mismatch configuration (because the CFLAGS are passed to the macro).
author Gaël PORTAY <gael.portay@gmail.com>
date Sat, 02 May 2015 13:33:34 +0200
parents ca71904cf3ee
children ef67b57fe438
comparison
equal deleted inserted replaced
1082:3cb73e8d6122 1088:f2a3570b5110
263 AC_CACHE_CHECK([for struct sockaddr_storage], ac_cv_have_struct_sockaddr_storage, [ 263 AC_CACHE_CHECK([for struct sockaddr_storage], ac_cv_have_struct_sockaddr_storage, [
264 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ 264 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
265 #include <sys/types.h> 265 #include <sys/types.h>
266 #include <sys/socket.h> 266 #include <sys/socket.h>
267 ]], 267 ]],
268 [[ struct sockaddr_storage s; ]])], 268 [[ if (sizeof(struct sockaddr_storage)) return 0 ]])],
269 [ ac_cv_have_struct_sockaddr_storage="yes" ], 269 [ ac_cv_have_struct_sockaddr_storage="yes" ],
270 [ ac_cv_have_struct_sockaddr_storage="no" ] 270 [ ac_cv_have_struct_sockaddr_storage="no" ]
271 ) 271 )
272 ]) 272 ])
273 if test "x$ac_cv_have_struct_sockaddr_storage" = "xyes" ; then 273 if test "x$ac_cv_have_struct_sockaddr_storage" = "xyes" ; then
277 AC_CACHE_CHECK([for struct sockaddr_in6], ac_cv_have_struct_sockaddr_in6, [ 277 AC_CACHE_CHECK([for struct sockaddr_in6], ac_cv_have_struct_sockaddr_in6, [
278 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ 278 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
279 #include <sys/types.h> 279 #include <sys/types.h>
280 #include <netinet/in.h> 280 #include <netinet/in.h>
281 ]], 281 ]],
282 [[ struct sockaddr_in6 s; s.sin6_family = 0; ]])], 282 [[ if (sizeof(struct sockaddr_in6)) return 0 ]])],
283 [ ac_cv_have_struct_sockaddr_in6="yes" ], 283 [ ac_cv_have_struct_sockaddr_in6="yes" ],
284 [ ac_cv_have_struct_sockaddr_in6="no" ] 284 [ ac_cv_have_struct_sockaddr_in6="no" ]
285 ) 285 )
286 ]) 286 ])
287 if test "x$ac_cv_have_struct_sockaddr_in6" = "xyes" ; then 287 if test "x$ac_cv_have_struct_sockaddr_in6" = "xyes" ; then
291 AC_CACHE_CHECK([for struct in6_addr], ac_cv_have_struct_in6_addr, [ 291 AC_CACHE_CHECK([for struct in6_addr], ac_cv_have_struct_in6_addr, [
292 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ 292 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
293 #include <sys/types.h> 293 #include <sys/types.h>
294 #include <netinet/in.h> 294 #include <netinet/in.h>
295 ]], 295 ]],
296 [[ struct in6_addr s; s.s6_addr[0] = 0; ]])], 296 [[ if (sizeof(struct in6_addr)) return 0 ]])],
297 [ ac_cv_have_struct_in6_addr="yes" ], 297 [ ac_cv_have_struct_in6_addr="yes" ],
298 [ ac_cv_have_struct_in6_addr="no" ] 298 [ ac_cv_have_struct_in6_addr="no" ]
299 ) 299 )
300 ]) 300 ])
301 if test "x$ac_cv_have_struct_in6_addr" = "xyes" ; then 301 if test "x$ac_cv_have_struct_in6_addr" = "xyes" ; then
306 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ 306 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
307 #include <sys/types.h> 307 #include <sys/types.h>
308 #include <sys/socket.h> 308 #include <sys/socket.h>
309 #include <netdb.h> 309 #include <netdb.h>
310 ]], 310 ]],
311 [[ struct addrinfo s; s.ai_flags = AI_PASSIVE; ]])], 311 [[ if (sizeof(struct addrinfo)) return 0 ]])],
312 [ ac_cv_have_struct_addrinfo="yes" ], 312 [ ac_cv_have_struct_addrinfo="yes" ],
313 [ ac_cv_have_struct_addrinfo="no" ] 313 [ ac_cv_have_struct_addrinfo="no" ]
314 ) 314 )
315 ]) 315 ])
316 if test "x$ac_cv_have_struct_addrinfo" = "xyes" ; then 316 if test "x$ac_cv_have_struct_addrinfo" = "xyes" ; then