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+dnl Reentrant time functions: localtime_r, gmtime_r.
+
+dnl Copyright (C) 2003, 2006-2011 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Written by Paul Eggert.
+
+AC_DEFUN([gl_TIME_R],
+[
+ dnl Persuade glibc and Solaris <time.h> to declare localtime_r.
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+ AC_REQUIRE([AC_C_RESTRICT])
+
+ dnl Some systems don't declare localtime_r() and gmtime_r() if _REENTRANT is
+ dnl not defined.
+ AC_CHECK_DECLS_ONCE([localtime_r])
+ 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
+ else
+ HAVE_LOCALTIME_R=0
+ fi
+ if test $HAVE_LOCALTIME_R = 0 || test $REPLACE_LOCALTIME_R = 1; then
+ AC_LIBOBJ([time_r])
+ gl_PREREQ_TIME_R
+ fi
+])
+
+# Prerequisites of lib/time_r.c.
+AC_DEFUN([gl_PREREQ_TIME_R], [
+ :
+])