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# perror.m4 serial 9
dnl Copyright (C) 2008-2020 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.
AC_DEFUN([gl_FUNC_PERROR],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([gl_HEADER_ERRNO_H])
AC_REQUIRE([gl_FUNC_STRERROR_R])
AC_REQUIRE([gl_FUNC_STRERROR_0])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl We intentionally do not check for the broader REPLACE_STRERROR_R,
dnl since on glibc systems, strerror_r is replaced only for signature
dnl issues, and perror is just fine. Rather, we only want to
dnl replace perror if strerror_r was replaced for a content fix.
if test "$ERRNO_H:$REPLACE_STRERROR_0" != :0; then
dnl The system's perror() cannot know about the new errno values we add
dnl to <errno.h>, or any fix for strerror(0). Replace it.
REPLACE_PERROR=1
fi
case ${gl_cv_func_strerror_r_works-unset} in
unset|*yes)
AC_CACHE_CHECK([whether perror matches strerror],
[gl_cv_func_perror_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
]],
[[char *str = strerror (-1);
if (!getenv("CONFTEST_OUTPUT")) return 0;
if (!str) str = "";
puts (str);
errno = -1;
perror ("");
return 0;
]])],
[if CONFTEST_OUTPUT=1 ./conftest$EXEEXT >conftest.txt1 2>conftest.txt2 \
&& cmp conftest.txt1 conftest.txt2 >/dev/null; then
gl_cv_func_perror_works=yes
else
gl_cv_func_perror_works=no
fi
rm -rf conftest.txt1 conftest.txt2],
[gl_cv_func_perror_works=no],
[case "$host_os" in
# Guess yes on musl systems.
*-musl*) gl_cv_func_perror_works="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_perror_works="guessing yes" ;;
# Otherwise obey --enable-cross-guesses.
*) gl_cv_func_perror_works="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_perror_works" in
*yes) ;;
*) REPLACE_PERROR=1 ;;
esac
;;
*)
dnl The system's perror() probably inherits the bugs in the
dnl system's strerror_r(). Replace it.
REPLACE_PERROR=1
;;
esac
])
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