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I want to create a static and a shared library using CMake to create the build environment. Furthermore it should create an ANSI and a UNICODE version.

I found this posting: Is it possible to get CMake to build both a static and shared version of the same library?

which told me that I can use multiple add_library statements to achieve this. When I tried it, it creates the libraries fine, but the posting doesn't tell me how to set different -D options depending on which version is built.

My CMakeLists.txt currently looks like this:

list(APPEND SUPPORT_SOURCE
    dll_main.cpp
)

add_definitions(-DBUILD_SUPPORT_DLL)

add_library(support SHARED ${SUPPORT_SOURCE} )
add_library(support_s STATIC ${SUPPORT_SOURCE} )
add_library(support_u SHARED ${SUPPORT_SOURCE} )
add_library(support_su STATIC ${SUPPORT_SOURCE} )

After all, when I build the DLL, the functions needs the __declspec(dllexport) declaration which it should not have in the static versions. Furthermore to build the UNICODE variant I need to pass -DUNICODE.

So I need to know which version is built and use appropriate build flags for it for the various targets.

Another thing I don't understand is, how I can create debug builds with a different name. I usually use the pattern libname.lib and libname_d.lib so I can have all possible versions in a single directory to link against.

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Devolus
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1 Answers1

2

You can set compiler flags per-target by using the target_compile_definitions command. For example:

target_compile_definitions(support PRIVATE MY_SHARED_DEFINITION)
target_compile_definitions(support_s PRIVATE MY_STATIC_DEFINITION)

As for adding a postfix to your debug libraries, you can achieve this by setting the CMake variable CMAKE_DEBUG_POSTFIX:

set(CMAKE_DEBUG_POSTFIX _d)

This will cause all non-executable targets to have _d appended when built in Debug. If you need more fine-grained control, you can set the DEBUG_POSTFIX property for individual targets:

set_target_properties(support support_s PROPERTIES DEBUG_POSTFIX -dbg)

This will override the global CMAKE_DEBUG_POSTFIX value for these two targets and give them a -dbg postfix instead.

Fraser
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