-# strerror.m4 serial 9
+# strerror.m4 serial 13
dnl Copyright (C) 2002, 2007-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_STRERROR],
[
- AC_REQUIRE([gl_FUNC_STRERROR_SEPARATE])
- if test $REPLACE_STRERROR = 1; then
- AC_LIBOBJ([strerror])
- AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
- [Define this to 1 if strerror is broken.])
- fi
-])
-
-# Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ).
-AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
-[
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_REQUIRE([gl_HEADER_ERRNO_H])
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
+ ])
if test -z "$ERRNO_H"; then
AC_CACHE_CHECK([for working strerror function],
[gl_cv_func_working_strerror],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
+ #include <errno.h>
]],
- [[return !*strerror (-2);]])],
+ [[int result = 0;
+ if (!*strerror (-2)) result |= 1;
+ errno = 0;
+ if (!*strerror (0)) result |= 2;
+ if (errno) result |= 4;
+ return result;]])],
[gl_cv_func_working_strerror=yes],
[gl_cv_func_working_strerror=no],
- [dnl Assume crossbuild works if it compiles.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <string.h>
- ]],
- [[return !*strerror (-2);]])],
- [gl_cv_func_working_strerror=yes],
- [gl_cv_func_working_strerror=no])
- ])
+ [dnl Be pessimistic on cross-compiles for now.
+ gl_cv_func_working_strerror=no])
])
if test $gl_cv_func_working_strerror = no; then
dnl The system's strerror() fails to return a string for out-of-range
dnl integers. Replace it.
REPLACE_STRERROR=1
fi
+ dnl If the system's strerror_r clobbers strerror, we must replace strerror.
+ case $gl_cv_func_strerror_r_works in
+ *no) REPLACE_STRERROR=1 ;;
+ esac
else
dnl The system's strerror() cannot know about the new errno values we add
dnl to <errno.h>. Replace it.
REPLACE_STRERROR=1
fi
- if test $REPLACE_STRERROR = 1; then
- gl_PREREQ_STRERROR
- fi
])
# Prerequisites of lib/strerror.c.