Hi David,
Sorry for the late reply.
* David Thompson wrote on Thu, Nov 24, 2005 at 12:05:43AM CET:
> Looking into this further. Here is the problem I'm seeing. (Autoconf
> 2.5.9 on cygwin).
>
> The function is defined as:
>
> m4_define([_AC_PROG_CXX_EXIT_DECLARATION],
> [for ac_declaration in \
> '' \
> 'extern "C" void std::exit (int) throw (); using std::exit;' \
*snip*
> But it appears that the #include <stdlib.h> is not used when
> ac_declaration is set to ''. I don't quite understand the syntax
>
> $ac_declaration
> @%:@include <stdlib.h>
`$ac_declaration' just expands into one of the declarations listed in
the macro. `@%:@' is a quadrigraph (documented in Autoconf manual) and
expands into `#'.
> Here is my output from the configure run: as you can see the include
> is listed for the second option just not the first. Why? Shouldn't
> the first option for ac_declaration produce just the #include
> <stdlib.h>?
This was with MSVC, right? Does it help if you add a declaration like
in the patch below (completely untested; you might have to tune it a
bit)? Note for testing you need to either rebuild and reinstall
autoconf from source, or remove the frozen file
$prefix/share/autoconf/autoconf/autoconf.m4f to pick up the changes.
Cheers,
Ralf
Index: lib/autoconf/c.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/c.m4,v
retrieving revision 1.208
diff -u -r1.208 c.m4
--- lib/autoconf/c.m4 1 Nov 2005 07:26:52 -0000 1.208
+++ lib/autoconf/c.m4 5 Jan 2006 09:43:31 -0000
@@ -783,6 +783,7 @@
'extern "C" void std::exit (int); using std::exit;' \
'extern "C" void exit (int) throw ();' \
'extern "C" void exit (int);' \
+ 'extern "C" void exit (int) __declspec(noreturn);' \
'void exit (int);'
do
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$ac_declaration
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