NEWS.stable: log cherry-pick [e446f25]->[c092018] relocatable-shell: Update suggested...

[gnulib.git] / m4 / c-strtod.m4

diff --git a/m4/c-strtod.m4 b/m4/c-strtod.m4
index c212c5c..69e964e 100644 (file)
--- a/m4/c-strtod.m4
+++ b/m4/c-strtod.m4
@@ -1,33 +1,49 @@
-# c-strtod.m4 serial 3
+# c-strtod.m4 serial 15
 
-# Copyright (C) 2004 Free Software Foundation, Inc.
-
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software Foundation,
-# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# Copyright (C) 2004-2006, 2009-2014 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
 # Written by Paul Eggert.
 
+AC_DEFUN([gl_C99_STRTOLD],
+[
+  AC_CACHE_CHECK([whether strtold conforms to C99],
+    [gl_cv_func_c99_strtold],
+    [AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[/* On HP-UX before 11.23, strtold returns a struct instead of
+                long double.  Reject implementations like that, by requiring
+                compatibility with the C99 prototype.  */
+             #include <stdlib.h>
+             static long double (*p) (char const *, char **) = strtold;
+             static long double
+             test (char const *nptr, char **endptr)
+             {
+               long double r;
+               r = strtold (nptr, endptr);
+               return r;
+             }]],
+           [[return test ("1.0", NULL) != 1 || p ("1.0", NULL) != 1;]])],
+       [gl_cv_func_c99_strtold=yes],
+       [gl_cv_func_c99_strtold=no])])
+  if test $gl_cv_func_c99_strtold = yes; then
+    AC_DEFINE([HAVE_C99_STRTOLD], [1], [Define to 1 if strtold conforms to C99.])
+  fi
+])
+
+dnl Prerequisites of lib/c-strtod.c.
 AC_DEFUN([gl_C_STRTOD],
 [
-  dnl Prerequisites of lib/c-strtod.c.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  :
+  AC_CHECK_FUNCS([strtod_l])
 ])
 
+dnl Prerequisites of lib/c-strtold.c.
 AC_DEFUN([gl_C_STRTOLD],
 [
-  dnl Prerequisites of lib/c-strtold.c.
-  AC_REQUIRE([gl_C_STRTOD])
-  AC_CHECK_DECLS_ONCE([strtold])
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_REQUIRE([gl_C99_STRTOLD])
+  AC_CHECK_FUNCS([strtold_l])
 ])