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Diffstat (limited to 'm4/time_r.m4')
| -rw-r--r-- | m4/time_r.m4 | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/m4/time_r.m4 b/m4/time_r.m4 new file mode 100644 index 0000000..21b4a2c --- /dev/null +++ b/m4/time_r.m4 @@ -0,0 +1,58 @@ +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], [ + : +]) |