wmii-hg does not compile with gcc-4.6

[GoogleCodeExporter]

Ubuntu 11.10 was used to compile the most recent revision (2809) and failed to 
link.  This website describes the problem (and their solution) in detail.

http://tecunhuman.com/wordpress/?p=405

Original issue reported on code.google.com by d8ot0...@gmail.com on 20 Oct 2011 at 8:06

[GoogleCodeExporter]

The scenario described in the blog post does not apply to wmii. 
wmii doesn't compile and link any binaries in a single step. 
Object files are always compiled separately and then linked. In 
the linking step, the libraries are always included after the 
objects in question (which has always been necessary in any 
compiler I've ever come across). If there are issues with GCC 
4.6, they're not the ones described in the linked post.

Original comment by maglion...@gmail.com on 20 Oct 2011 at 8:13

[GoogleCodeExporter]

Sorry for the poor wording of the ticket.  My point was that when wmii tries to 
link under gcc 4.6 it fails because of the change in ordering. ie:

MAKE all cmd/x11/
CC cmd/x11/wikeyname.o
LD cmd/x11/wikeyname.out
cc -o wikeyname.out wikeyname.o -lXinerama -lXrender -lX11 -lXrandr 
-Wl,-Bsymbolic-functions -g -ldl -g -ldl -g -ldl -L../../lib -L/usr/lib 
../../lib/libstuff.a ../../lib/libregexp9.a ../../lib/libbio.a 
../../lib/libfmt.a ../../lib/libutf.a /usr/lib/libixp.a
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:55: undefined reference to 
`XRRQueryExtension'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:57: undefined reference to 
`XRRQueryVersion'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:60: undefined reference to 
`XRRSelectInput'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:72: undefined reference to 
`XRRUpdateConfiguration'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:93: undefined reference to 
`XRenderQueryExtension'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:121: undefined reference to 
`XRenderFindVisualFormat'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:131: undefined reference to 
`XineramaQueryExtension'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:136: undefined reference to 
`XineramaIsActive'
/home/kraay/wmii-hg-new/wmii/lib/libstuff/xext.c:151: undefined reference to 
`XineramaQueryScreens'
collect2: ld returned 1 exit status
make[5]: *** [wikeyname.out] Error 1
make[4]: *** [dall] Error 2
make[3]: *** [dall] Error 2
make[2]: *** [override_dh_auto_build] Error 2
make[1]: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
make: *** [deb] Error 2

Now, if we jiggle around the external libraries -lXinerama -lXrender -lXrandr 
and place them before libstuff.a.  It will link.

I don't know if this change in behaviour is due to a bug in gcc 4.6 or an extra 
feature - I'll leave that decision up to you.  Regardless, if you're not 
interested in fixing it, I wanted to create an ticket here so anyone using 
ubuntu 11.10 will be able to find it and make the necessary changes.

Original comment by d8ot0...@gmail.com on 20 Oct 2011 at 8:41

[GoogleCodeExporter]

This issue was closed by revision 7acfb1d933b3.

Original comment by maglion...@gmail.com on 20 Oct 2011 at 8:56

• Changed state: Fixed

[GoogleCodeExporter]

Not quite -ldl also needs to be appended (sorry, I forgot to report that -- I'd 
forgotten):

So: -lXinerama -lXrender -lX11 -lXrandr -ldl will work 

cc -o wmii9menu.out wmii9menu.o -Wl,-Bsymbolic-functions -g -ldl -g -ldl -g 
-ldl -L../../lib -L/usr/lib ../../lib/libstuff.a ../../lib/libregexp9.a 
../../lib/libbio.a ../../lib/libfmt.a ../../lib/libutf.a /usr/lib/libixp.a 
-lXinerama -lXrender -lX11 -lXrandr
/usr/bin/ld: ../../lib/libstuff.a(xft.o): undefined reference to symbol 
'dlopen@@GLIBC_2.1'
/usr/bin/ld: note: 'dlopen@@GLIBC_2.1' is defined in DSO 
/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libdl.so so try 
adding it to the linker command line
/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libdl.so: could not 
read symbols: Invalid operation
collect2: ld returned 1 exit status
make[5]: *** [wmii9menu.out] Error 1
make[4]: *** [dall] Error 2
make[3]: *** [dall] Error 2
make[2]: *** [override_dh_auto_build] Error 2
make[1]: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
make: *** [deb] Error 2

Original comment by d8ot0...@gmail.com on 20 Oct 2011 at 9:42

[GoogleCodeExporter]

I had same issues and fixed all of them in util/link with an extra $LDFLAGS :

[ -n "$PACKAGES" ] && LDFLAGS="$LDFLAGS $(pkg-config --libs $PACKAGES) $LDFLAGS"

happy compiling :)

Original comment by xpix...@gmail.com on 26 Dec 2011 at 1:10