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-rw-r--r--gnulib-m4/perror.m471
1 files changed, 71 insertions, 0 deletions
diff --git a/gnulib-m4/perror.m4 b/gnulib-m4/perror.m4
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+++ b/gnulib-m4/perror.m4
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+# perror.m4 serial 10
+dnl Copyright (C) 2008-2022 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 "$GL_GENERATE_ERRNO_H:$REPLACE_STRERROR_0" != false: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
+])