WARNING: Way of disabling --as-needed in spec changed from:
%define no_build_with_as_needed 1
to more generic one:
%define filterout_ld -Wl,--as-needed
but, DON'T USE IT ! Fix spec instead.
Why ? Because it's very stupid. If something fails to build normally
it's a sign --as-needed did well it's job and disabled unneeded
libraries.
Here goes a little example, xmoto:
With -Wl,--as-needed enabled it stops on something like this:
==========================================================================
x86_64-pld-linux-g++ -DNOMMGR -Wall -DGAMEDATADIR=\"/usr/share/xmoto\"
-mfpmath=sse -ggdb -O2 -ftree-vectorize -ftree-vectorizer-verbose=1
-march=athlon64 -mmmx -msse -msse2 -m3dnow -s -Wl,--as-needed -Wl,-s -o
xmoto-edit BuiltInFont.o Image.o LevelSrc.o VApp.o VBezier.o VDraw.o
VDrawText.o VFileIO.o VMath.o VTexture.o VXml.o tim.o tim_io_stdio.o tim_jpeg.o
tim_memory_crt.o tim_png.o tinystr.o tinyxml.o tinyxmlerror.o tinyxmlparser.o
md5.o md5file.o FileCompression.o SwapEndian.o DBuffer.o CRCHash.o Theme.o
WWW.o Editor.o EditorMain.o EditorData.o EditorLog.o Packager.o -lGL -lcurl
-lode -llualib50 -llua50 -lSDL_mixer -lbz2 -lz -lpng -ljpeg
VApp.o: In function `vapp::App::getRealTime()':
src/VApp.cpp:287: undefined reference to `SDL_GetTicks'
VApp.o: In function `vapp::App::getTime()':
src/VApp.cpp:284: undefined reference to `SDL_GetTicks'
[... bunch of SDL functions ...]
Editor.o: In function `vapp::EditorApp::viewDrawGrid()':
src/Editor.cpp:777: undefined reference to `SDL_GetMouseState'
Editor.o:src/Editor.cpp:46: more undefined references to `SDL_GetMouseState'
follow
EditorMain.o: In function `main':
src/EditorMain.cpp:59: undefined reference to `SDL_Quit'
collect2: ld returned 1 exit status
make[1]: *** [xmoto-edit] Error 1
==========================================================================
So let's try to find some of missing symbols:
[EMAIL PROTECTED] SPECS]$ grep SDL_GetMouseState /usr/lib64/libSDL*
Binary file /usr/lib64/libSDL-1.2.so.0 matches
Binary file /usr/lib64/libSDL-1.2.so.0.11.0 matches
Binary file /usr/lib64/libSDL.so matches
they are in -lSDL, but binary does not link with -lSDL;
edit Makefile by hand and add -lSDL at the same place as -lSDL_mixer is:
LIBS = -lcurl -lode -llualib50 -llua50 -lSDL_mixer -lSDL -lbz2 -lz -lpng -ljpeg
What we get after running make in build tree:
==========================================================================
x86_64-pld-linux-g++ -DNOMMGR -Wall -DGAMEDATADIR=\"/usr/share/xmoto\"
-mfpmath=sse -ggdb -O2 -ftree-vectorize -ftree-vectorizer-verbose=1
-march=athlon64 -mmmx -msse -msse2 -m3dnow -s -Wl,--as-needed -Wl,-s -o
xmoto-edit BuiltInFont.o Image.o LevelSrc.o VApp.o VBezier.o VDraw.o
VDrawText.o VFileIO.o VMath.o VTexture.o VXml.o tim.o tim_io_stdio.o tim_jpeg.o
tim_memory_crt.o tim_png.o tinystr.o tinyxml.o tinyxmlerror.o tinyxmlparser.o
md5.o md5file.o FileCompression.o SwapEndian.o DBuffer.o CRCHash.o Theme.o
WWW.o Editor.o EditorMain.o EditorData.o EditorLog.o Packager.o -lcurl -lode
-llualib50 -llua50 -lSDL_mixer -lSDL -lbz2 -lz -lpng -ljpeg
VApp.o: In function `vapp::App::grabScreen()':
src/VApp.cpp:667: undefined reference to `glReadBuffer'
src/VApp.cpp:671: undefined reference to `glReadPixels'
[...]
src/Editor.cpp:1280: undefined reference to `glEnable'
src/Editor.cpp:1288: undefined reference to `glDisable'
collect2: ld returned 1 exit status
==========================================================================
Same thing:
[EMAIL PROTECTED] xmoto-0.2.0]$ grep glEnableClientState /usr/lib64/lib*
Binary file /usr/lib64/libGL.so matches
Binary file /usr/lib64/libGL.so.1 matches
Binary file /usr/lib64/libGL.so.1.2 matches
LIBS = -lcurl -lode -llualib50 -llua50 -lSDL_mixer -lSDL -lGL -lbz2 -lz -lpng
-ljpeg
But take a look at spec file, -lGL thing was fixed there already:
%{__make} \
GL_LIBS="-lGL"
Anyway, lets run make, and what we get ?
==========================================================================
x86_64-pld-linux-g++ -DNOMMGR -Wall -DGAMEDATADIR=\"/usr/share/xmoto\"
-mfpmath=sse -ggdb -O2 -ftree-vectorize -ftree-vectorizer-verbose=1
-march=athlon64 -mmmx -msse -msse2 -m3dnow -s -Wl,--as-needed -Wl,-s -o
xmoto-edit BuiltInFont.o Image.o LevelSrc.o VApp.o VBezier.o VDraw.o
VDrawText.o VFileIO.o VMath.o VTexture.o VXml.o tim.o tim_io_stdio.o tim_jpeg.o
tim_memory_crt.o tim_png.o tinystr.o tinyxml.o tinyxmlerror.o tinyxmlparser.o
md5.o md5file.o FileCompression.o SwapEndian.o DBuffer.o CRCHash.o Theme.o
WWW.o Editor.o EditorMain.o EditorData.o EditorLog.o Packager.o -lcurl -lode
-llualib50 -llua50 -lSDL_mixer -lSDL -lGL -lbz2 -lz -lpng -ljpeg
make[1]: Leaving directory `/home/users/sparky/rpm/BUILD/xmoto-0.2.0'
==========================================================================
It worked !
But why was it working without --as-needed ?
Answer is realy easy: libSDL is required by SDL_mixer:
[EMAIL PROTECTED] xmoto-0.2.0]$ ldd /usr/lib64/libSDL_mixer-1.2.so.0.2.4 | grep
SDL
libSDL-1.2.so.0 => /usr/lib64/libSDL-1.2.so.0 (0x00002ab425307000)
but xmoto-edit contains no SDL_mixer symbols, that's why xmoto-edit
wasn't linked with SDL_mixer, and nothing provided SDL library
Can you see now why was it so stupid to disable --as-needed ? It worked
just perfectly !
Finally, fix for this may be:
%configure \
LIBS="-lSDL -lGL"
or patching configure.in
and the result is:
Wrote: /home/users/sparky/rpm/RPMS/xmoto-0.2.0-2.x86_64.rpm
I hope this little example will help you.
--
____ Sparky{PI] -- Przemyslaw _ ___ _ _ ........... LANG...Pl..Ca..Es..En
/____) ___ ___ _ _ || Iskra | | _ \| | | : WWW........ppcrcd.pld-linux.org
\____\| -_)'___| ||^'||//\\// < | _/| | | : JID......sparky<at>jabberes.org
(____/|| (_-_|_|| ||\\ || |_ |_| |_| _| : Mail....sparky<at>pld-linux.org
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