- AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
- [gl_cv_time_r_posix],
- [AC_TRY_COMPILE(
- [#include <time.h>],
- [/* We don't need to append 'restrict's to the argument types,
- even though the POSIX signature has the 'restrict's,
- since C99 says they can't affect type compatibility. */
- struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
- if (ptr) return 0;
- /* Check the return type is a pointer. On HP-UX 10 it is 'int'. */
- *localtime_r (0, 0);],
- [gl_cv_time_r_posix=yes],
- [gl_cv_time_r_posix=no])])
- if test $gl_cv_time_r_posix = yes; then
- REPLACE_LOCALTIME_R=0
+ dnl Some systems don't declare localtime_r() and gmtime_r() if _REENTRANT is
+ dnl not defined.
+ AC_CHECK_DECLS([localtime_r], [], [], [[#include <time.h>]])
+ if test $ac_cv_have_decl_localtime_r = no; then
+ HAVE_DECL_LOCALTIME_R=0
+ fi
+
+ AC_CHECK_FUNCS_ONCE([localtime_r])
+ if test $ac_cv_func_localtime_r = yes; then
+ HAVE_LOCALTIME_R=1
+ AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
+ [gl_cv_time_r_posix],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <time.h>]],
+ [[/* We don't need to append 'restrict's to the argument types,
+ even though the POSIX signature has the 'restrict's,
+ since C99 says they can't affect type compatibility. */
+ struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
+ if (ptr) return 0;
+ /* Check the return type is a pointer.
+ On HP-UX 10 it is 'int'. */
+ *localtime_r (0, 0);]])
+ ],
+ [gl_cv_time_r_posix=yes],
+ [gl_cv_time_r_posix=no])
+ ])
+ if test $gl_cv_time_r_posix = yes; then
+ REPLACE_LOCALTIME_R=0
+ else
+ REPLACE_LOCALTIME_R=1
+ fi