From 90f9f433355179db5dc4b7a7c6326986af11924d Mon Sep 17 00:00:00 2001 From: Gaël PORTAY Date: Sat, 2 May 2015 13:33:34 +0200 Subject: 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). --- configure.ac | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'configure.ac') diff --git a/configure.ac b/configure.ac index b0e85e5..6ae8c32 100644 --- a/configure.ac +++ b/configure.ac @@ -265,7 +265,7 @@ AC_CACHE_CHECK([for struct sockaddr_storage], ac_cv_have_struct_sockaddr_storage #include #include ]], - [[ struct sockaddr_storage s; ]])], + [[ if (sizeof(struct sockaddr_storage)) return 0 ]])], [ ac_cv_have_struct_sockaddr_storage="yes" ], [ ac_cv_have_struct_sockaddr_storage="no" ] ) @@ -279,7 +279,7 @@ AC_CACHE_CHECK([for struct sockaddr_in6], ac_cv_have_struct_sockaddr_in6, [ #include #include ]], - [[ struct sockaddr_in6 s; s.sin6_family = 0; ]])], + [[ if (sizeof(struct sockaddr_in6)) return 0 ]])], [ ac_cv_have_struct_sockaddr_in6="yes" ], [ ac_cv_have_struct_sockaddr_in6="no" ] ) @@ -293,7 +293,7 @@ AC_CACHE_CHECK([for struct in6_addr], ac_cv_have_struct_in6_addr, [ #include #include ]], - [[ struct in6_addr s; s.s6_addr[0] = 0; ]])], + [[ if (sizeof(struct in6_addr)) return 0 ]])], [ ac_cv_have_struct_in6_addr="yes" ], [ ac_cv_have_struct_in6_addr="no" ] ) @@ -308,7 +308,7 @@ AC_CACHE_CHECK([for struct addrinfo], ac_cv_have_struct_addrinfo, [ #include #include ]], - [[ struct addrinfo s; s.ai_flags = AI_PASSIVE; ]])], + [[ if (sizeof(struct addrinfo)) return 0 ]])], [ ac_cv_have_struct_addrinfo="yes" ], [ ac_cv_have_struct_addrinfo="no" ] ) -- cgit v1.2.3