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# Merge_static_libs(outlib lib1 lib2 ... libn) merges a number of static
# libs into a single static library
function(merge_static_libs outlib )
set(libs ${ARGV})
list(REMOVE_AT libs 0)
# Create a dummy file that the target will depend on
set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/${outlib}_dummy.c)
file(WRITE ${dummyfile} "const char * dummy = \"${dummyfile}\";")
add_library(${outlib} STATIC ${dummyfile})
if("${CMAKE_CFG_INTDIR}" STREQUAL ".")
set(multiconfig FALSE)
else()
set(multiconfig TRUE)
endif()
# First get the file names of the libraries to be merged
foreach(lib ${libs})
get_target_property(libtype ${lib} TYPE)
if(NOT libtype STREQUAL "STATIC_LIBRARY")
message(FATAL_ERROR "Merge_static_libs can only process static libraries")
endif()
if(multiconfig)
foreach(CONFIG_TYPE ${CMAKE_CONFIGURATION_TYPES})
get_target_property("libfile_${CONFIG_TYPE}" ${lib} "LOCATION_${CONFIG_TYPE}")
list(APPEND libfiles_${CONFIG_TYPE} ${libfile_${CONFIG_TYPE}})
endforeach()
else()
get_target_property(libfile ${lib} LOCATION)
list(APPEND libfiles "${libfile}")
endif(multiconfig)
endforeach()
message(STATUS "will be merging ${libfiles}")
# Just to be sure: cleanup from duplicates
if(multiconfig)
foreach(CONFIG_TYPE ${CMAKE_CONFIGURATION_TYPES})
list(REMOVE_DUPLICATES libfiles_${CONFIG_TYPE})
set(libfiles ${libfiles} ${libfiles_${CONFIG_TYPE}})
endforeach()
endif()
list(REMOVE_DUPLICATES libfiles)
# Now the easy part for MSVC and for MAC
if(MSVC)
# lib.exe does the merging of libraries just need to conver the list into string
foreach(CONFIG_TYPE ${CMAKE_CONFIGURATION_TYPES})
set(flags "")
foreach(lib ${libfiles_${CONFIG_TYPE}})
set(flags "${flags} ${lib}")
endforeach()
string(TOUPPER "STATIC_LIBRARY_FLAGS_${CONFIG_TYPE}" PROPNAME)
set_target_properties(${outlib} PROPERTIES ${PROPNAME} "${flags}")
endforeach()
elseif(APPLE)
# Use OSX's libtool to merge archives
if(multiconfig)
message(FATAL_ERROR "Multiple configurations are not supported")
endif()
get_target_property(outfile ${outlib} LOCATION)
add_custom_command(TARGET ${outlib} POST_BUILD
COMMAND rm ${outfile}
COMMAND /usr/bin/libtool -static -o ${outfile}
${libfiles}
)
else()
# general UNIX - need to "ar -x" and then "ar -ru"
if(multiconfig)
message(FATAL_ERROR "Multiple configurations are not supported")
endif()
get_target_property(outfile ${outlib} LOCATION)
message(STATUS "outfile location is ${outfile}")
foreach(lib ${libfiles})
# objlistfile will contain the list of object files for the library
set(objlistfile ${lib}.objlist)
set(objdir ${lib}.objdir)
set(objlistcmake ${objlistfile}.cmake)
# we only need to extract files once
if(${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/cmake.check_cache IS_NEWER_THAN ${objlistcmake})
#---------------------------------
FILE(WRITE ${objlistcmake}
"# Extract object files from the library
message(STATUS \"Extracting object files from ${lib}\")
EXECUTE_PROCESS(COMMAND ${CMAKE_AR} -x ${lib}
WORKING_DIRECTORY ${objdir})
# save the list of object files
EXECUTE_PROCESS(COMMAND ls .
OUTPUT_FILE ${objlistfile}
WORKING_DIRECTORY ${objdir})")
#---------------------------------
file(MAKE_DIRECTORY ${objdir})
add_custom_command(
OUTPUT ${objlistfile}
COMMAND ${CMAKE_COMMAND} -P ${objlistcmake}
DEPENDS ${lib})
endif()
list(APPEND extrafiles "${objlistfile}")
# relative path is needed by ar under MSYS
file(RELATIVE_PATH objlistfilerpath ${objdir} ${objlistfile})
add_custom_command(TARGET ${outlib} POST_BUILD
COMMAND ${CMAKE_COMMAND} -E echo "Running: ${CMAKE_AR} ru ${outfile} @${objlistfilerpath}"
COMMAND ${CMAKE_AR} ru "${outfile}" @"${objlistfilerpath}"
WORKING_DIRECTORY ${objdir})
endforeach()
add_custom_command(TARGET ${outlib} POST_BUILD
COMMAND ${CMAKE_COMMAND} -E echo "Running: ${CMAKE_RANLIB} ${outfile}"
COMMAND ${CMAKE_RANLIB} ${outfile})
endif()
file(WRITE ${dummyfile}.base "const char* ${outlib}_sublibs=\"${libs}\";")
add_custom_command(
OUTPUT ${dummyfile}
COMMAND ${CMAKE_COMMAND} -E copy ${dummyfile}.base ${dummyfile}
DEPENDS ${libs} ${extrafiles})
endfunction()
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