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RE: Native ObjC exceptions configure test broken with libobjc2

From: Nicola Pero
Subject: RE: Native ObjC exceptions configure test broken with libobjc2
Date: Sat, 18 Sep 2010 20:24:56 +0200 (CEST)

I'd suggest that libobjc2 could include a minimal Object implementation.
Having Object is handy to perform simple configure tests and both the Apple
and GNU runtime include a minimal implementation for that reason ... it would
make sense for libobjc2 to do so too ;-)

Else, if you have a patch to get the test to work with libobjc2 as it is, 
I'd happily accept it.


-----Original Message-----
From: "Quentin Mathé" <address@hidden>
Sent: Saturday, 18 September, 2010 19:24
To: "GNUstep Developer" <address@hidden>
Subject: Native ObjC exceptions configure test broken with libobjc2

Gnustep-dev mailing list

Native ObjC exceptions support was recently turned on by default in
gnustep-make. However this doesn't work with libobjc2, at least the
configure test. objc/objc.h is missing to eliminate the 'nil' warning and
Object in libobjc2 has an empty implementation. So either Object needs a
more complete implementation or the exception test should be written in
another way.
I'm using libobjc2 r31373 (today) and gnustep-make r31362. Here is the
config.log output:

configure:6413: checking for the GCC version
configure:6440: result: version: 4.4
configure:6461: checking whether we should use native ObjC exceptions
configure:6514: gcc -o conftest -g -O2 -x objective-c -I.
-I/Local/Library/Headers   -L/Local/Library/Librari
es -fgnu-runtime -DGNU_RUNTIME -fexceptions -fobjc-exceptions   conftest.c
-lobjc -shared-libgcc -fexceptions >
conftest.c: In function 'main':
conftest.c:7: error: 'nil' undeclared (first use in this function)
conftest.c:7: error: (Each undeclared identifier is reported only once
conftest.c:7: error: for each function it appears in.)
conftest.c:10: warning: 'Object' may not respond to '+new'
conftest.c:10: warning: (Messages without a matching method signature
conftest.c:10: warning: will be assumed to return 'id' and accept
conftest.c:10: warning: '...' as arguments.)
configure:6518: $? = 1
configure: program exited with status 1
configure: failed program was:
| #include <stdlib.h>
| #include <objc/Object.h>
| int main(int argc, char **argv)
| {
|     Object *o=nil;
|     @try
|     {
|         o=[Object new];
|         @throw o;
|     }
|     @catch (id foo)
|     {
|         if (o!=foo)
|             return 1;
|     }
|     return 0;
| }
configure:6545: result: no: native exceptions are not supported by the

Here is the result of gcc -v:
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.4.3-4ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin
--enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i486
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)


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