| # 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 |
| ]) |