Bug 18829

This bug also cause a fatal error when we install the gtkmm and make new apps
that uses AM_PATH_GTKMM macro in its
configure.in.

But I think this is better patch for this.
Thank you.

--- autoconf-2.13/acgeneral.m4.orig	Tue Jan  5 22:27:37 1999
+++ autoconf-2.13/acgeneral.m4	Sun Nov 12 04:17:10 2000
@@ -1818,7 +1818,7 @@
 [#]line __oline__ "configure"
 #include "confdefs.h"
 ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
-extern "C" void exit(int);
+extern "C" void exit(int) throw();
 #endif
 ])dnl
 [$1]

Looks like there functional prototype is in more then just acgeneral.m4
.

# pwd
/usr/share/autoconf

# grep -i 'extern "C" void exit(int)' *
acgeneral.m4:extern "C" void exit(int) throw();
autoconf.m4f:extern "C" void exit(int);
autoheader.m4f:extern "C" void exit(int);

Trying to compile gnomemm-1.1.14 on Redhat 7.0

I applied the above patch to acgeneral.m4

$ pwd
/usr/src/redhat/BUILD/gnomemm-1.1.14
 
		Make sure to remove old configure and rebuild it
$ rm configure
$  automake ; autoconf
$ ./configure  --prefix=/usr --disable-maintainer-mode --disable-static
--enable-shared --enable-docs
 checking for GTK-- - version >= 1.2.3... no
*** Could not run GTK-- test program, checking why...
$ grep -i 'extern "C" void exit(int)' *
config.log:extern "C" void exit(int);
configure:extern "C" void exit(int);
configure:extern "C" void exit(int);

That patch is not pickedup by automake or autoconf. 

So how wil this be resolved? Is it an autoconf bug, or a gcc bug?

[Yukihiro Nakai's patch is in autoconf-2.13-10 (Red Hat 7.1).]
And I checked that
   AC_LANG_CPLUSPLUS
   AC_TRY_RUN([#include <stdlib.h>], , AC_MSG_ERROR(Aaaaargh))
autoconf'ed ok with autoconf-2.13-10.

Also configure of gnomemm runs ok (both 1.1.14 and 1.1.21).

So since all the above seems to have been fixed in 7.1,
I suggest that this bug can be closed.

No, gnomemm configure works because we patched our own copies of aclocal, or
edited the generated configure scripts before distributing gnomemm.

Yukihiro Nakai's patch would not work because it would create configure scripts
that worked on Redhat but not on other platforms. Our solution was to remove the
void exit declaration line completely.

To test any solution, you would need to autogen.sh gnomemm on both Redhat and an
older distribution, then try to configure the resultant distributions on the
other distributions.

Thanks for the comment.

So I back-ported _AC_PROG_CXX_EXIT_DECLARATION from autoconf-2.50, where this
problem has already be addressed. The patch below should hopefully allow
autoconf to generate configure files for C++ that will work on many platforms.
I hope this makes C++ users happy.


--- autoconf-2.13/acgeneral.m4~	Tue Jun 26 17:00:28 2001
+++ autoconf-2.13/acgeneral.m4	Tue Jun 26 17:00:28 2001
@@ -1817,10 +1817,6 @@
 [cat > conftest.$ac_ext <<EOF
 [#]line __oline__ "configure"
 #include "confdefs.h"
-ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
-extern "C" void exit(int);
-#endif
-])dnl
 [$1]
 EOF
 if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest; exit)
2>/dev/null
--- autoconf-2.13/acspecific.m4~	Tue Jun 26 17:04:34 2001
+++ autoconf-2.13/acspecific.m4		Tue Jun 26 17:04:34 2001
@@ -152,8 +152,41 @@
     CXXFLAGS=
   fi
 fi
+
+AC_PROG_CXX_EXIT_DECLARATION
 ])
 
+
+# AC_PROG_CXX_EXIT_DECLARATION
+# -----------------------------
+# Find a valid prototype for exit and declare it in confdefs.h.
+AC_DEFUN(AC_PROG_CXX_EXIT_DECLARATION,
+[for ac_declaration in \
+   ''\
+   '#include <stdlib.h>' \
+   'extern "C" void std::exit (int) throw (); using std::exit;' \
+   'extern "C" void std::exit (int); using std::exit;' \
+   'extern "C" void exit (int) throw ();' \
+   'extern "C" void exit (int);' \
+   'void exit (int);'
+do
+  AC_TRY_COMPILE([#include <stdlib.h>
+$ac_declaration], 
+                 [exit (42);],
+                 [],
+                 [continue])
+  AC_TRY_COMPILE([$ac_declaration],
+                 [exit (42);],
+                 [break])
+done
+if test -n "$ac_declaration"; then
+  echo '#ifdef __cplusplus' >>confdefs.h
+  echo $ac_declaration      >>confdefs.h
+  echo '#endif'             >>confdefs.h
+fi
+])# AC_PROG_CXX_EXIT_DECLARATION
+
+
 dnl Determine a Fortran 77 compiler to use.  If `F77' is not already set
 dnl in the environment, check for `g77', `f77' and `f2c', in that order.
 dnl Set the output variable `F77' to the name of the compiler found.