| # strsignal.m4 serial 8 |
| dnl Copyright (C) 2008-2016 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_STRSIGNAL], |
| [ |
| dnl Persuade glibc <string.h> to declare strsignal(). |
| AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| |
| AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) |
| AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| |
| AC_CHECK_DECLS_ONCE([strsignal]) |
| if test $ac_cv_have_decl_strsignal = no; then |
| HAVE_DECL_STRSIGNAL=0 |
| fi |
| |
| AC_CHECK_FUNCS([strsignal]) |
| if test $ac_cv_func_strsignal = yes; then |
| HAVE_STRSIGNAL=1 |
| dnl Check if strsignal behaves reasonably for out-of-range signal numbers. |
| dnl On Solaris it returns NULL; on AIX 5.1 it returns (char *) -1. |
| AC_CACHE_CHECK([whether strsignal always returns a string], |
| [gl_cv_func_working_strsignal], |
| [AC_RUN_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#include <string.h> |
| #include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */ |
| ]], |
| [[int result = 0; |
| char *s = strsignal (-1); |
| if (s == (char *) 0) |
| result |= 1; |
| if (s == (char *) -1) |
| result |= 2; |
| return result; |
| ]])], |
| [gl_cv_func_working_strsignal=yes], |
| [gl_cv_func_working_strsignal=no], |
| [case "$host_os" in |
| solaris* | aix*) gl_cv_func_working_strsignal=no;; |
| *) gl_cv_func_working_strsignal="guessing yes";; |
| esac])]) |
| if test "$gl_cv_func_working_strsignal" = no; then |
| REPLACE_STRSIGNAL=1 |
| fi |
| else |
| HAVE_STRSIGNAL=0 |
| fi |
| ]) |
| |
| # Prerequisites of lib/strsignal.c. |
| AC_DEFUN([gl_PREREQ_STRSIGNAL], [ |
| AC_CHECK_HEADERS_ONCE([unistd.h]) |
| AC_REQUIRE([AC_DECL_SYS_SIGLIST]) |
| AC_CHECK_DECLS([_sys_siglist], [], [], [[#include <signal.h>]]) |
| ]) |
