[CMake] how to add custom linker flags when creating shared libs

[Alexander Neundorf]

Hi, 
 
what's the best way to add custom options to the linker command when 
creating shared libraries (plugins) ? 
 
I have: 
c++ -fPIC  -shared -Wl,-soname,libkdevcustomproject.so -o 
libkdevcustomproject.so "kdevcustomproject.dir/customprojectpart.o" 
"kdevcustomproject.dir/custombuildoptionswidget.o" 
"kdevcustomproject.dir/custommakeconfigwidget.o" 
"kdevcustomproject.dir/custombuildoptionswidgetbase.o" 
"kdevcustomproject.dir/custombuildoptionswidgetbase.moc.o" 
"kdevcustomproject.dir/custommakeconfigwidgetbase.o" 
"kdevcustomproject.dir/custommakeconfigwidgetbase.moc.o"  -L/opt/kde/lib 
-Wl,-rpath,/opt/kde/lib 
 
and I'd like to have (taken from original KDE build using libtool): 
 
g++  -Wnon-virtual-dtor -Wno-long-long -Wundef -ansi -D_XOPEN_SOURCE=500 
-D_BSD_SOURCE -Wcast-align -Wconversion -Wchar-subscripts -Wall -W 
-Wpointer-arith -Wwrite-strings -O2 -Wformat-security 
-Wmissing-format-attribute -fno-exceptions -fno-check-new -fno-common 
-DQT_CLEAN_NAMESPACE -DQT_NO_ASCII_CAST -DQT_NO_STL -DQT_NO_COMPAT 
-DQT_NO_TRANSLATION    -o libkdevcustomproject.la 
-rpath /opt/kde/lib/kde3 -L/opt/kde/lib -L/usr/lib/qt/lib 
-L/usr/X11R6/lib    -avoid-version -module -no-undefined 
-Wl,--no-undefined -Wl,--allow-shlib-undefined -R /opt/kde/lib 
-R /opt/kde/lib -R /usr/lib/qt/lib -R /usr/X11R6/lib  
customprojectpart.lo custombuildoptionswidget.lo 
custommakeconfigwidget.lo custombuildoptionswidgetbase.lo 
custommakeconfigwidgetbase.lo ../../lib/libkdevelop.la
../../buildtools/lib/widgets/libkdevbuildtoolswidgets.la
../../buildtools/lib/base/libkdevbuildbase.la 
 
So what's the recommended way to add the stuff from "-avoid-version" to 
"-R /..." to the cmake generated Makefiles ? 
I tried setting: 
 
SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS 
${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS} -no-undefined) 
 
but I didn't see any changes. 
 
I tried to redefine  
SET(CMAKE_CXX_CREATE_SHARED_LIBRARY "<CMAKE_CXX_COMPILER> 
<CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LINK_FLAGS> 
<CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> 
<CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> 
-avoid-version -module -no-undefined  <OBJECTS> <LINK_LIBRARIES>") 
 
which worked, but feels quite "brute force". Is there a better way ? 
Also c++ (g++) complained about the unknown option "-no-undefined" 
although it works with the libtool command line which contains the same 
option. 
 
And a last question, what's the difference between a MODULE and a SHARED 
lib ? Is MODULE intended to be used for plugins ? 
Is there a way to get Makefiles which generate plugins without the "lib" 
prefix in the filename ? 
 
Bye 
Alex 
 

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