From 52d5988afb5999c71fd24484a93efefa2a9e9a8f Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Wed, 14 Jun 2023 14:41:04 +0200 Subject: [PATCH 1298/1298] C99 compatibility enhancements for the configure script (#2519) * configure.ac: Enable system extensions Use AC_USE_SYSTEM_EXTENSIONS to build with _GNU_SOURCE (and similar macros on non-GNU systems), to avoid an implicit declaration of the strptime function. This improves compatibility with future compilers which do not support implicit function declarations. * configure.ac: gettimeofday lives in The gettimeofday function is declared in , not , according to POSIX and actual systems. This avoids a configure probe failure with compilers which do not support implicit function declarations. --- configure.ac | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/configure.ac +++ b/configure.ac @@ -22,6 +22,7 @@ AC_PROG_CPP_WERROR AC_PROG_YACC AC_OBJEXT AC_EXEEXT +AC_USE_SYSTEM_EXTENSIONS LT_INIT([shared static win32-dll]) AM_PROG_CC_C_O @@ -129,7 +130,7 @@ AC_FIND_FUNC([gmtime_r], [c], [#include AC_FIND_FUNC([gmtime], [c], [#include ], [0]) AC_FIND_FUNC([localtime_r], [c], [#include ], [0, 0]) AC_FIND_FUNC([localtime], [c], [#include ], [0]) -AC_FIND_FUNC([gettimeofday], [c], [#include ], [0, 0]) +AC_FIND_FUNC([gettimeofday], [c], [#include ], [0, 0]) AC_CHECK_MEMBER([struct tm.tm_gmtoff], [AC_DEFINE([HAVE_TM_TM_GMT_OFF],1,[Define to 1 if the system has the tm_gmt_off field in struct tm])], [], [[#include ]]) AC_CHECK_MEMBER([struct tm.__tm_gmtoff], [AC_DEFINE([HAVE_TM___TM_GMT_OFF],1,[Define to 1 if the system has the __tm_gmt_off field in struct tm])],