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-rw-r--r--gnulib-m4/strerror.m4116
1 files changed, 72 insertions, 44 deletions
diff --git a/gnulib-m4/strerror.m4 b/gnulib-m4/strerror.m4
index 1649b245..75a17f20 100644
--- a/gnulib-m4/strerror.m4
+++ b/gnulib-m4/strerror.m4
@@ -1,68 +1,96 @@
-# strerror.m4 serial 9
-dnl Copyright (C) 2002, 2007-2010 Free Software Foundation, Inc.
+# strerror.m4 serial 17
+dnl Copyright (C) 2002, 2007-2015 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_STRERROR],
[
- AC_REQUIRE([gl_FUNC_STRERROR_SEPARATE])
- if test $REPLACE_STRERROR = 1; then
- AC_LIBOBJ([strerror])
- AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
- [Define this to 1 if strerror is broken.])
- fi
-])
-
-# Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ).
-AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
-[
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_REQUIRE([gl_HEADER_ERRNO_H])
- if test -z "$ERRNO_H"; then
+ AC_REQUIRE([gl_FUNC_STRERROR_0])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
+ ])
+ if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
AC_CACHE_CHECK([for working strerror function],
[gl_cv_func_working_strerror],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
]],
- [[return !*strerror (-2);]])],
+ [[if (!*strerror (-2)) return 1;]])],
[gl_cv_func_working_strerror=yes],
[gl_cv_func_working_strerror=no],
- [dnl Assume crossbuild works if it compiles.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <string.h>
- ]],
- [[return !*strerror (-2);]])],
- [gl_cv_func_working_strerror=yes],
- [gl_cv_func_working_strerror=no])
- ])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_working_strerror="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_working_strerror="guessing no" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_working_strerror" in
+ *yes) ;;
+ *)
+ dnl The system's strerror() fails to return a string for out-of-range
+ dnl integers. Replace it.
+ REPLACE_STRERROR=1
+ ;;
+ esac
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
+ dnl buffer, we must replace strerror.
+ case "$gl_cv_func_strerror_r_works" in
+ *no) REPLACE_STRERROR=1 ;;
+ esac
])
- if test $gl_cv_func_working_strerror = no; then
- dnl The system's strerror() fails to return a string for out-of-range
- dnl integers. Replace it.
- REPLACE_STRERROR=1
- fi
else
dnl The system's strerror() cannot know about the new errno values we add
- dnl to <errno.h>. Replace it.
+ dnl to <errno.h>, or any fix for strerror(0). Replace it.
REPLACE_STRERROR=1
fi
- if test $REPLACE_STRERROR = 1; then
- gl_PREREQ_STRERROR
- fi
])
-# Prerequisites of lib/strerror.c.
-AC_DEFUN([gl_PREREQ_STRERROR], [
- AC_CHECK_DECLS([strerror])
- AC_CHECK_HEADERS_ONCE([sys/socket.h])
- if test $ac_cv_header_sys_socket_h != yes; then
- dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
- dnl the check for those headers unconditional; yet cygwin reports
- dnl that the headers are present but cannot be compiled (since on
- dnl cygwin, all socket information should come from sys/socket.h).
- AC_CHECK_HEADERS([winsock2.h])
- fi
+dnl Detect if strerror(0) passes (that is, does not set errno, and does not
+dnl return a string that matches strerror(-1)).
+AC_DEFUN([gl_FUNC_STRERROR_0],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ REPLACE_STRERROR_0=0
+ AC_CACHE_CHECK([whether strerror(0) succeeds],
+ [gl_cv_func_strerror_0_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ #include <errno.h>
+ ]],
+ [[int result = 0;
+ char *str;
+ errno = 0;
+ str = strerror (0);
+ if (!*str) result |= 1;
+ if (errno) result |= 2;
+ if (strstr (str, "nknown") || strstr (str, "ndefined"))
+ result |= 4;
+ return result;]])],
+ [gl_cv_func_strerror_0_works=yes],
+ [gl_cv_func_strerror_0_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_strerror_0_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_strerror_0_works="guessing no" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_strerror_0_works" in
+ *yes) ;;
+ *)
+ REPLACE_STRERROR_0=1
+ AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0)
+ does not return a message implying success.])
+ ;;
+ esac
])