X-Git-Url: https://git.cworth.org/git?p=tar;a=blobdiff_plain;f=m4%2Ftime_r.m4;fp=m4%2Ftime_r.m4;h=9e82d39ffbdfe2c86d33a8d66f3c41aae9c7c46d;hp=b5938e79638a846153d3ac660a33bb24abb063f5;hb=ee168310ec4227174ace489bf5f81f8c2f91cde0;hpb=22f1eb8bc17e5be72dd23d42d6aaa60196ac22e6

diff --git a/m4/time_r.m4 b/m4/time_r.m4
index b5938e7..9e82d39 100644
--- a/m4/time_r.m4
+++ b/m4/time_r.m4
@@ -1,7 +1,6 @@
-dnl Reentrant time functions like localtime_r.
+dnl Reentrant time functions: localtime_r, gmtime_r.
 
-dnl Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2003, 2006-2010 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.
@@ -10,29 +9,40 @@ dnl Written by Paul Eggert.
 
 AC_DEFUN([gl_TIME_R],
 [
- dnl Persuade glibc and Solaris <time.h> to declare localtime_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])
 
-  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
+  AC_CHECK_FUNCS_ONCE([localtime_r])
+  if test $ac_cv_func_localtime_r = yes; then
+    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
-    REPLACE_LOCALTIME_R=1
+    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