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-rw-r--r--gnulib-m4/strerror.m468
1 files changed, 68 insertions, 0 deletions
diff --git a/gnulib-m4/strerror.m4 b/gnulib-m4/strerror.m4
new file mode 100644
index 00000000..8c16ca9a
--- /dev/null
+++ b/gnulib-m4/strerror.m4
@@ -0,0 +1,68 @@
+# strerror.m4 serial 9
+dnl Copyright (C) 2002, 2007-2008 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_CACHE_CHECK([for working strerror function],
+ [gl_cv_func_working_strerror],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ ]],
+ [[return !*strerror (-2);]])],
+ [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])
+ ])
+ ])
+ 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.
+ 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
+])