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60 lines
1.9 KiB
Plaintext
60 lines
1.9 KiB
Plaintext
# strsignal.m4 serial 8
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dnl Copyright (C) 2008-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_STRSIGNAL],
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[
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dnl Persuade glibc <string.h> to declare strsignal().
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_DECLS_ONCE([strsignal])
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if test $ac_cv_have_decl_strsignal = no; then
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HAVE_DECL_STRSIGNAL=0
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fi
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AC_CHECK_FUNCS([strsignal])
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if test $ac_cv_func_strsignal = yes; then
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HAVE_STRSIGNAL=1
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dnl Check if strsignal behaves reasonably for out-of-range signal numbers.
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dnl On Solaris it returns NULL; on AIX 5.1 it returns (char *) -1.
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AC_CACHE_CHECK([whether strsignal always returns a string],
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[gl_cv_func_working_strsignal],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <string.h>
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#include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */
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]],
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[[int result = 0;
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char *s = strsignal (-1);
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if (s == (char *) 0)
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result |= 1;
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if (s == (char *) -1)
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result |= 2;
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return result;
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]])],
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[gl_cv_func_working_strsignal=yes],
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[gl_cv_func_working_strsignal=no],
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[case "$host_os" in
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solaris* | aix*) gl_cv_func_working_strsignal=no;;
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*) gl_cv_func_working_strsignal="guessing yes";;
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esac])])
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if test "$gl_cv_func_working_strsignal" = no; then
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REPLACE_STRSIGNAL=1
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fi
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else
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HAVE_STRSIGNAL=0
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fi
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])
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# Prerequisites of lib/strsignal.c.
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AC_DEFUN([gl_PREREQ_STRSIGNAL], [
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AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_REQUIRE([AC_DECL_SYS_SIGLIST])
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AC_CHECK_DECLS([_sys_siglist], [], [], [[#include <signal.h>]])
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])
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