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Diffstat (limited to 'src/ceph/cmake/modules/MergeStaticLibraries.cmake')
| -rw-r--r-- | src/ceph/cmake/modules/MergeStaticLibraries.cmake | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/ceph/cmake/modules/MergeStaticLibraries.cmake b/src/ceph/cmake/modules/MergeStaticLibraries.cmake new file mode 100644 index 0000000..92d4156 --- /dev/null +++ b/src/ceph/cmake/modules/MergeStaticLibraries.cmake @@ -0,0 +1,85 @@ +# This function is a helper that will merge static libraries. +# For example, +# +# merge_static_libraries(mylib staticlibX staticlibY) +# +# mylib.a will generate a new static library mylib that is +# a combination of staticlibX and staticlibY +# +function(merge_static_libraries target) + + set(dummy_source ${CMAKE_CURRENT_BINARY_DIR}/${target}_dummy.c) + add_library(${target} STATIC ${dummy_source}) + + # remove duplicates + set(libs ${ARGN}) + list(REMOVE_DUPLICATES libs) + + # validate that all libs are static + foreach(lib ${libs}) + if (NOT TARGET ${lib}) + message(FATAL_ERROR "${lib} not a valid target") + endif() + + get_target_property(libtype ${lib} TYPE) + if(NOT libtype STREQUAL "STATIC_LIBRARY") + message(FATAL_ERROR "${lib} not a static library") + endif() + + # add a dependency on the lib + add_dependencies(${target} ${lib}) + endforeach() + + # Force the merged Make the generated dummy source file depended on all static input + # libs. If input lib changes,the source file is touched + # which causes the desired effect (relink). + add_custom_command( + OUTPUT ${dummy_source} + COMMAND ${CMAKE_COMMAND} -E touch ${dummy_source} + DEPENDS ${libs}) + + # only LINUX is currently supported. OSX's libtool and windows lib.exe + # have native support for merging static libraries, and support for them + # can be easily added if required. + if(LINUX) + # generate a script to merge the static libraries in to the target + # library. see https://sourceware.org/binutils/docs/binutils/ar-scripts.html + set(mri_script "open $<TARGET_FILE:${target}>=") + foreach(lib ${libs}) + # we use the generator expression TARGET_FILE to get the location + # of the library. this will not be expanded until the script file + # is written below + set(mri_script "${mri_script} addlib $<TARGET_FILE:${lib}>=") + endforeach() + set(mri_script "${mri_script} save=end") + + add_custom_command( + TARGET ${target} POST_BUILD + COMMAND echo ${mri_script} | tr = \\\\n | ${CMAKE_AR} -M) + endif(LINUX) + + message("-- MergeStaticLibraries: ${target}: merged ${libs}") + + # we want to set the target_link_libraries correctly for the new merged + # static library. First we get the list of link libraries for each + # of the libs we are merging + set(link_libs) + foreach(lib ${libs}) + get_property(trans TARGET ${lib} PROPERTY LINK_LIBRARIES) + list(APPEND link_libs ${trans}) + endforeach() + + if (link_libs) + # now remove the duplicates and any of the libraries we already merged + list(REMOVE_DUPLICATES link_libs) + foreach(lib ${libs}) + list(REMOVE_ITEM link_libs ${lib}) + endforeach() + + # set the target link libraries + target_link_libraries(${target} ${link_libs}) + + message("-- MergeStaticLibraries: ${target}: remaining ${link_libs}") + endif() + +endfunction() |