| 1 | # perror.m4 serial 10
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| 2 | dnl Copyright (C) 2008-2022 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN([gl_FUNC_PERROR],
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| 8 | [
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| 9 | AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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| 10 | AC_REQUIRE([gl_HEADER_ERRNO_H])
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| 11 | AC_REQUIRE([gl_FUNC_STRERROR_R])
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| 12 | AC_REQUIRE([gl_FUNC_STRERROR_0])
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| 13 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 14 | dnl We intentionally do not check for the broader REPLACE_STRERROR_R,
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| 15 | dnl since on glibc systems, strerror_r is replaced only for signature
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| 16 | dnl issues, and perror is just fine. Rather, we only want to
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| 17 | dnl replace perror if strerror_r was replaced for a content fix.
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| 18 | if test "$GL_GENERATE_ERRNO_H:$REPLACE_STRERROR_0" != false:0; then
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| 19 | dnl The system's perror() cannot know about the new errno values we add
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| 20 | dnl to <errno.h>, or any fix for strerror(0). Replace it.
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| 21 | REPLACE_PERROR=1
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| 22 | fi
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| 23 | case ${gl_cv_func_strerror_r_works-unset} in
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| 24 | unset|*yes)
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| 25 | AC_CACHE_CHECK([whether perror matches strerror],
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| 26 | [gl_cv_func_perror_works],
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| 27 | [AC_RUN_IFELSE(
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| 28 | [AC_LANG_PROGRAM(
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| 29 | [[#include <errno.h>
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| 30 | #include <stdio.h>
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| 31 | #include <stdlib.h>
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| 32 | #include <string.h>
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| 33 | ]],
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| 34 | [[char *str = strerror (-1);
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| 35 | if (!getenv("CONFTEST_OUTPUT")) return 0;
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| 36 | if (!str) str = "";
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| 37 | puts (str);
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| 38 | errno = -1;
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| 39 | perror ("");
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| 40 | return 0;
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| 41 | ]])],
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| 42 | [if CONFTEST_OUTPUT=1 ./conftest$EXEEXT >conftest.txt1 2>conftest.txt2 \
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| 43 | && cmp conftest.txt1 conftest.txt2 >/dev/null; then
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| 44 | gl_cv_func_perror_works=yes
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| 45 | else
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| 46 | gl_cv_func_perror_works=no
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| 47 | fi
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| 48 | rm -rf conftest.txt1 conftest.txt2],
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| 49 | [gl_cv_func_perror_works=no],
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| 50 | [case "$host_os" in
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| 51 | # Guess yes on musl systems.
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| 52 | *-musl*) gl_cv_func_perror_works="guessing yes" ;;
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| 53 | # Guess yes on native Windows.
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| 54 | mingw*) gl_cv_func_perror_works="guessing yes" ;;
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| 55 | # Otherwise obey --enable-cross-guesses.
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| 56 | *) gl_cv_func_perror_works="$gl_cross_guess_normal" ;;
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| 57 | esac
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| 58 | ])
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| 59 | ])
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| 60 | case "$gl_cv_func_perror_works" in
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| 61 | *yes) ;;
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| 62 | *) REPLACE_PERROR=1 ;;
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| 63 | esac
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| 64 | ;;
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| 65 | *)
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| 66 | dnl The system's perror() probably inherits the bugs in the
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| 67 | dnl system's strerror_r(). Replace it.
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| 68 | REPLACE_PERROR=1
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| 69 | ;;
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| 70 | esac
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| 71 | ])
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