-# strndup.m4 serial 15
-dnl Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc.
+# strndup.m4 serial 21
+dnl Copyright (C) 2002-2003, 2005-2014 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 Persuade glibc <string.h> to declare strndup().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_CHECK_DECLS_ONCE([strndup])
+ AC_CHECK_FUNCS_ONCE([strndup])
if test $ac_cv_have_decl_strndup = no; then
HAVE_DECL_STRNDUP=0
fi
- # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
- AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
- [AC_RUN_IFELSE([
- AC_LANG_PROGRAM([[#include <string.h>
- #include <stdlib.h>]], [[
-#ifndef HAVE_DECL_STRNDUP
- extern char *strndup (const char *, size_t);
+ if test $ac_cv_func_strndup = yes; then
+ HAVE_STRNDUP=1
+ # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
+ AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup_works],
+ [AC_RUN_IFELSE([
+ AC_LANG_PROGRAM([[#include <string.h>
+ #include <stdlib.h>]], [[
+#if !HAVE_DECL_STRNDUP
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ char *strndup (const char *, size_t);
#endif
char *s;
s = strndup ("some longer string", 15);
free (s);
s = strndup ("shorter string", 13);
return s[13] != '\0';]])],
- [gl_cv_func_strndup=yes],
- [gl_cv_func_strndup=no],
- [AC_CHECK_FUNC([strndup],
- [AC_EGREP_CPP([too risky], [
-#ifdef _AIX
- too risky
-#endif
- ],
- [gl_cv_func_strndup=no],
- [gl_cv_func_strndup=yes])],
- [gl_cv_func_strndup=no])])])
- if test $gl_cv_func_strndup = yes; then
- AC_DEFINE([HAVE_STRNDUP], 1,
- [Define if you have the strndup() function and it works.])
+ [gl_cv_func_strndup_works=yes],
+ [gl_cv_func_strndup_works=no],
+ [
+changequote(,)dnl
+ case $host_os in
+ aix | aix[3-6]*) gl_cv_func_strndup_works="guessing no";;
+ *) gl_cv_func_strndup_works="guessing yes";;
+ esac
+changequote([,])dnl
+ ])])
+ case $gl_cv_func_strndup_works in
+ *no) REPLACE_STRNDUP=1 ;;
+ esac
else
HAVE_STRNDUP=0
- AC_LIBOBJ([strndup])
- gl_PREREQ_STRNDUP
fi
])
-
-# Prerequisites of lib/strndup.c.
-AC_DEFUN([gl_PREREQ_STRNDUP], [:])