Hi
I am porting a gnu make project to CMake. Initially I am using the Ninja
generator and running in Ubuntu 18.04.
The project consists of a static library 'libKernel.a', which includes
main.cpp,
which we link into an executable: 'MyApp'. The program dynamically loads
shared
libraries that need objects from 'libKernel.a' so we use options such as
-whole-archive and -export-dynamic.
The original link command for the program is:
g++ -o _gnuRelease/MyApp -Wl,-whole-archive,-export-dynamic,--no-as-needed
../Kernel/_gnuRelease/libKernel.a -Wl,--as-needed,--no-whole-archive
-lpthread -ldl
In CMake I have implemented this as:
add_executable(MyApp ../Kernel/main.cpp)
set_target_properties(MyApp PROPERTIES ENABLE_EXPORTS TRUE)
target_link_libraries(MyApp Kernel ${CMAKE_DL_LIBS})
and CMake's link command is:
/usr/bin/c++ -O3 -DNDEBUG -Wl,--export-dynamic -rdynamic
CMakeFiles/MyApp.dir/Kernel/main.cpp.o -o release/MyApp
Kernel/libKernel.a -ldl
The CMake build is failing to link at runtime as some symbols are missing.
I have two issues here:
1) In the CMake implementation I removed main.cpp from libKernel and
specified
it as the executable source file, as it seems that the executable needs at
least one SOURCE file. Is there a way around this?
2) How can I tell CMake to use the
'-Wl,-whole-archive,-export-dynamic,--no-as-needed' flags?
Best regards
David
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