Compiling two backends

[Pablo Di Noto]

Hi list,

I have read somewhere that it is possible to have several x11 backends 
with different graphic engines (say x11 and art) and the switch between 
them changing a default.

I tried building gnustep-back-0.10.1 release, first with
./configure --enable-graphics=art --with-name=backart
without problem.

After install I get 
/usr/GNUstep/System/Library/Bundles/libgnustep-backart-010.bundle/
as expected.

Then I make clean and go with
./configure --enable-graphics=x11 --with-name=back
and build fails at linking time with lots of:

----8<---------------------------------------------------
 ...
 Compiling file XIMInputServer.m ...
 Compiling file XWindowBuffer.m ...
 Compiling file XGGLFormat.m ...
 Compiling file XGGLContext.m ...
 Linking subproject x11 ...
make[2]: Leaving directory 
`/root/Development/GNUstep/gnustep-back-0.10.1/Source/x11'
make[2]: Entering directory 
`/root/Development/GNUstep/gnustep-back-0.10.1/Source/x11'
Making all for subproject x11...
make[3]: Nothing to be done for `internal-subproject-all'.
make[2]: Leaving directory 
`/root/Development/GNUstep/gnustep-back-0.10.1/Source/x11'
Making all for bundle libgnustep-back-010...
 Creating libgnustep-back-010.bundle/....
 Compiling file GSBackend.m ...
GSBackend.m: In function '+[GSBackend initializeBackend]':
GSBackend.m:56: warning: 'XGServer' may not respond to '+initializeBackend'
GSBackend.m:56: warning: (Messages without a matching method signature
GSBackend.m:56: warning: will be assumed to return 'id' and accept
GSBackend.m:56: warning: '...' as arguments.)
 Linking bundle libgnustep-back-010 ...
./x11/shared_obj/subproject.o: In function `xgps_cursor_image':
: multiple definition of `xgps_cursor_image'
./x11/shared_obj/subproject.o:: first defined here
./x11/shared_obj/subproject.o:(.rodata+0xe0): multiple definition of 
`__objc_category_name_NSTextView_InputMethod'
./x11/shared_obj/subproject.o:(.rodata+0xe0): first defined here
./x11/shared_obj/subproject.o: In function `RPutXImage':
: multiple definition of `RPutXImage'
./x11/shared_obj/subproject.o:: first defined here
./x11/shared_obj/subproject.o: In function `XGErrorHandler':
: multiple definition of `XGErrorHandler'
./x11/shared_obj/subproject.o:: first defined here
./x11/shared_obj/subproject.o:(.rodata+0x100): multiple definition of 
`__objc_category_name_XGServer_X11Ops'
./x11/shared_obj/subproject.o:(.rodata+0x100): first defined here
./x11/shared_obj/subproject.o:(.rodata+0x950): multiple definition of 
`__objc_category_name_NSEvent_WindowHack'
./x11/shared_obj/subproject.o:(.rodata+0x950): first defined here
./x11/shared_obj/subproject.o:(.rodata+0x104): multiple definition of 
`__objc_category_name_XGServer_XSync'
./x11/shared_obj/subproject.o:(.rodata+0x104): first defined here
...
----8<---------------------------------------------------

and so on... until it gives up with:

----8<---------------------------------------------------
...: multiple definition of `RCreateXImage'
./x11/shared_obj/subproject.o:: first defined here
collect2: ld returned 1 exit status
make[2]: *** [libgnustep-back-010.bundle/./libgnustep-back-010] Error 1
make[1]: *** [libgnustep-back-010.all.bundle.variables] Error 2
make[1]: Leaving directory 
`/root/Development/GNUstep/gnustep-back-0.10.1/Source'
make: *** [internal-all] Error 2
----8<---------------------------------------------------

Also tried with a fresh untarring instead of simply make clean.

Using the latests release versions gnustep-back-0.10.1, 
gnustep-base-1.11.1, gnustep-gui-0.10.1, gnustep-make-1.11.1 on Debian 
unstable, with these packages:

||/ Name                           Version
+++-==============================-=====================
ii  gcc-4.0                        4.0.2-2
ii  gcc-4.0-base                   4.0.2-2
ii  gobjc-4.0                      4.0.2-2
ii  kernel-image-2.6-amd64-k8      103
ii  libart-2.0-2                   2.3.17-1
ii  libart-2.0-dev                 2.3.17-1
ii  libaudiofile-dev               0.2.6-6
ii  libaudiofile0                  0.2.6-6
ii  libc6                          2.3.5-7
ii  libc6-dev                      2.3.5-7
ii  libffcall1                     1.10-2
ii  libffcall1-dev                 1.10-2
ii  libfreetype6                   2.1.10-1
ii  libfreetype6-dev               2.1.10-1
ii  libgcc1                        4.0.2-2
ii  libglib2.0-0                   2.8.3-1
ii  libglib2.0-data                2.8.3-1
ii  libjpeg62                      6b-10
ii  libjpeg62-dev                  6b-10
ii  libpng10-0                     1.0.18-1
ii  libpng12-0                     1.2.8rel-5
ii  libpng12-dev                   1.2.8rel-5
ii  libpng2                        1.0.18-1
ii  libpng3                        1.2.8rel-5
ii  libpng3-dev                    1.2.8rel-1
ii  libssl-dev                     0.9.8a-2
ii  libssl0.9.8                    0.9.8a-2
ii  libtiff-opengl                 3.7.4-1
ii  libtiff-tools                  3.7.4-1
ii  libtiff4                       3.7.4-1
ii  libtiff4-dev                   3.7.4-1
ii  libtiffxx0c2                   3.7.4-1
ii  libungif4g                     4.1.3-3
ii  libx11-6                       6.8.2.dfsg.1-9
ii  libx11-dev                     6.8.2.dfsg.1-9
ii  libxslt1-dev                   1.1.15-1
ii  libxslt1.1                     1.1.15-1
ii  zlib1g                         1.2.3-6
ii  zlib1g-dev                     1.2.3-6

Thanks in advance!
///Pablo