2 dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_PERROR],
9 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
10 AC_REQUIRE([gl_HEADER_ERRNO_H])
11 AC_REQUIRE([gl_FUNC_STRERROR_R])
12 AC_REQUIRE([gl_FUNC_STRERROR_0])
13 dnl We intentionally do not check for the broader REPLACE_STRERROR_R,
14 dnl since on glibc systems, strerror_r is replaced only for signature
15 dnl issues, and perror is just fine. Rather, we only want to
16 dnl replace perror if strerror_r was replaced for a content fix.
17 if test "$ERRNO_H:$REPLACE_STRERROR_0" != :0; then
18 dnl The system's perror() cannot know about the new errno values we add
19 dnl to <errno.h>, or any fix for strerror(0). Replace it.
22 case ${gl_cv_func_strerror_r_works-unset} in
24 AC_CACHE_CHECK([whether perror matches strerror],
25 [gl_cv_func_perror_works],
31 [[char *str = strerror (-1);
32 if (!getenv("CONFTEST_OUTPUT")) return 0;
38 [CONFTEST_OUTPUT=1 ./conftest$EXEEXT >conftest.txt1 2>conftest.txt2
39 if cmp conftest.txt1 conftest.txt2 >/dev/null; then
40 gl_cv_func_perror_works=yes
42 gl_cv_func_perror_works=no
44 rm -rf conftest.txt1 conftest.txt2],
45 [gl_cv_func_perror_works=no],
46 [dnl Guess no when cross-compiling.
47 gl_cv_func_perror_works="guessing no"])])
48 if test "$gl_cv_func_perror_works" != yes; then
51 *) dnl The system's perror() probably inherits the bugs in the
52 dnl system's strerror_r(). Replace it.