+ dnl On mingw, localtime_r() is defined as an inline function; use through a
+ dnl direct function call works but the use as a function pointer leads to a
+ dnl link error.
+ AC_CACHE_CHECK([whether localtime_r exists as an inline function],
+ [gl_cv_func_localtime_r_inline],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[/* mingw's <time.h> provides the functions asctime_r, ctime_r,
+ gmtime_r, localtime_r only if <unistd.h> or <pthread.h> has
+ been included before. */
+ #if defined __MINGW32__
+ # include <unistd.h>
+ #endif
+ #include <time.h>
+ ]],
+ [[time_t a;
+ struct tm r;
+ localtime_r (&a, &r);
+ ]])
+ ],
+ [gl_cv_func_localtime_r_inline=yes],
+ [gl_cv_func_localtime_r_inline=no])
+ ])
+ if test $gl_cv_func_localtime_r_inline = yes; then
+ REPLACE_LOCALTIME_R=1
+ fi