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Diffstat (limited to '')
| -rw-r--r-- | m4/perror.m4 | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/m4/perror.m4 b/m4/perror.m4 new file mode 100644 index 0000000..9842b24 --- /dev/null +++ b/m4/perror.m4 @@ -0,0 +1,76 @@ +# perror.m4 serial 12 +dnl Copyright (C) 2008-2023 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 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 "$host_os" in + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_perror_works="guessing yes" ;; + # Guess yes on native Windows. + mingw*) gl_cv_func_perror_works="guessing yes" ;; + # Otherwise obey --enable-cross-guesses. + *) gl_cv_func_perror_works="$gl_cross_guess_normal" ;; + esac + ]) + ]) + case "$gl_cv_func_perror_works" in + *yes) ;; + *) REPLACE_PERROR=1 ;; + esac + ;; + *) + dnl The system's perror() probably inherits the bugs in the + dnl system's strerror_r(). Replace it. + REPLACE_PERROR=1 + ;; + esac + dnl Does perror clobber the strerror buffer? + case "$host_os" in + # Yes on Android 11. + linux*-android*) REPLACE_PERROR=1 ;; + esac +]) |