assume <ctype.h>, ..., <time.h> exist

[gnulib.git] / m4 / signal_h.m4

diff --git a/m4/signal_h.m4 b/m4/signal_h.m4
index 0a10547..77eb125 100644 (file)
--- a/m4/signal_h.m4
+++ b/m4/signal_h.m4
@@ -1,5 +1,5 @@
-# signal_h.m4 serial 5
-dnl Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+# signal_h.m4 serial 11
+dnl Copyright (C) 2007-2011 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.
@@ -7,18 +7,34 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_SIGNAL_H],
 [
   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
-  gl_CHECK_NEXT_HEADERS([signal.h])
+  gl_NEXT_HEADERS([signal.h])
+# AIX declares sig_atomic_t to already include volatile, and C89 compilers
+# then choke on 'volatile sig_atomic_t'.  C99 requires that it compile.
+  AC_CHECK_TYPE([volatile sig_atomic_t], [],
+    [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
+#include <signal.h>
+    ]])
+  AC_REQUIRE([AC_TYPE_UID_T])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[#include <signal.h>
+    ]], [sigaction sigaddset sigdelset sigemptyset sigfillset sigismember
+    sigpending sigprocmask])
 ])
 
 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
 [
   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
-  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+  dnl Define it also as a C macro, for the benefit of the unit tests.
+  gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
 [
+  GNULIB_SIGNAL_H_SIGPIPE=0;   AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
   GNULIB_SIGPROCMASK=0;        AC_SUBST([GNULIB_SIGPROCMASK])
   GNULIB_SIGACTION=0;          AC_SUBST([GNULIB_SIGACTION])
   dnl Assume proper GNU behavior unless another module says otherwise.
@@ -28,4 +44,6 @@ AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
   HAVE_SIGACTION=1;            AC_SUBST([HAVE_SIGACTION])
   HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
                                AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
+  HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
+                               AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
 ])