Mercurial > hg > octave-kai > gnulib-hg
diff m4/signal_h.m4 @ 11424:2b94c0e7849d
signal.h: always support 'volatile sig_atomic_t'
* m4/signal_h.m4 (gl_SIGNAL_H): Check for AIX limitation.
(gl_SIGNAL_H_DEFAULTS): Add a default.
* modules/signal (Makefile.am): Substitute if needed.
* lib/signal.in.h (sig_atomic_t): Redefine if needed, so that
users can blindly add volatile.
* doc/posix-headers/signal.texi (signal.h): Document it.
Reported by Matthew Woehlke.
Signed-off-by: Eric Blake <ebb9@byu.net>
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Sat, 21 Mar 2009 17:57:40 -0600 |
| parents | 5a24031ebf7d |
| children | 8c827f8e5f04 |
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--- a/m4/signal_h.m4 +++ b/m4/signal_h.m4 @@ -1,5 +1,5 @@ -# signal_h.m4 serial 6 -dnl Copyright (C) 2007, 2008 Free Software Foundation, Inc. +# signal_h.m4 serial 7 +dnl Copyright (C) 2007, 2008, 2009 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. @@ -8,6 +8,12 @@ [ AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) gl_CHECK_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_DEFUN([gl_SIGNAL_MODULE_INDICATOR], @@ -29,4 +35,6 @@ 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]) ])