| dnl Reentrant time functions: localtime_r, gmtime_r. |
| |
| dnl Copyright (C) 2003, 2006-2016 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([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 |
| else |
| HAVE_LOCALTIME_R=0 |
| fi |
| ]) |
| |
| # Prerequisites of lib/time_r.c. |
| AC_DEFUN([gl_PREREQ_TIME_R], [ |
| : |
| ]) |
