cmake: merge libs via virtual object libraries
CMake issued a warming about policy CMP0026: access of LOCATION target property at config time was disallowed. Offending code was the code that merged static libraries to generate libwallet_merged.a. This patch does that same merge task in a much simpler way. And, since it doesn't violate the policy, the warning went away.
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# Copyright (C) 2012 Modelon AB
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the BSD style license.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# FMILIB_License.txt file for more details.
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# You should have received a copy of the FMILIB_License.txt file
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# along with this program. If not, contact Modelon AB <http://www.modelon.com>.
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# Merge_static_libs(outlib lib1 lib2 ... libn) merges a number of static
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# libs into a single static library
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function(merge_static_libs outlib )
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set(libs ${ARGV})
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list(REMOVE_AT libs 0)
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list(REMOVE_DUPLICATES libs) # just in case
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# First get the file names of the libraries to be merged
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foreach(lib ${libs})
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get_target_property(libtype ${lib} TYPE)
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if(NOT libtype STREQUAL "STATIC_LIBRARY")
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message(FATAL_ERROR "merge_static_libs can only process static libraries")
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endif()
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set(libfiles "${libfiles} $<TARGET_FILE:${lib}>")
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endforeach()
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if(MSVC) # lib.exe does the merging of given a list
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set_target_properties(${outlib} PROPERTIES STATIC_LIBRARY_FLAGS "${libfiles}")
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elseif(APPLE) # Use OSX's libtool to merge archives
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add_custom_command(TARGET ${outlib} POST_BUILD
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COMMAND rm "$<TARGET_FILE:${outlib}>"
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COMMAND /usr/bin/libtool -static -o "$<TARGET_FILE:${outlib}>" ${libfiles})
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else() # general UNIX: use "ar" to extract objects and re-add to a common lib
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foreach(lib ${libs})
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set(objlistfile ${lib}.objlist) # list of objects in the input library
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set(objdir ${lib}.objdir)
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add_custom_command(OUTPUT ${objdir}
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COMMAND ${CMAKE_COMMAND} -E make_directory ${objdir})
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add_custom_command(OUTPUT ${objlistfile}
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COMMAND ${CMAKE_AR} -x "$<TARGET_FILE:${lib}>"
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COMMAND ${CMAKE_AR} -t "$<TARGET_FILE:${lib}>" > ../${objlistfile}
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DEPENDS ${lib} ${objdir}
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WORKING_DIRECTORY ${objdir})
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# Empty dummy source file that goes into merged library
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set(mergebase ${lib}.mergebase.c)
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add_custom_command(OUTPUT ${mergebase}
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COMMAND ${CMAKE_COMMAND} -E touch ${mergebase}
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DEPENDS ${objlistfile})
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list(APPEND mergebases "${mergebase}")
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endforeach()
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# We need a target for the output merged library
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add_library(${outlib} STATIC ${mergebases})
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set(outlibfile "$<TARGET_FILE:${outlib}>")
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foreach(lib ${libs})
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add_custom_command(TARGET ${outlib} POST_BUILD
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COMMAND ${CMAKE_AR} ru ${outlibfile} @"../${objlistfile}"
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WORKING_DIRECTORY ${objdir})
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endforeach()
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add_custom_command(TARGET ${outlib} POST_BUILD
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COMMAND ${CMAKE_RANLIB} ${outlibfile})
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endif()
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endfunction()
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@ -82,8 +82,13 @@ function (bitmonero_add_library name)
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FILES
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${ARGN})
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add_library("${name}"
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${ARGN})
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# Define a ("virtual") object library and an actual library that links those
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# objects together. The virtual libraries can be arbitrarily combined to link
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# any subset of objects into one library archive. This is used for releasing
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# libwallet, which combines multiple components.
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set(objlib obj_${name})
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add_library(${objlib} OBJECT ${ARGN})
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add_library("${name}" STATIC $<TARGET_OBJECTS:${objlib}>)
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set_property(TARGET "${name}"
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PROPERTY
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FOLDER "libs")
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@ -27,7 +27,6 @@
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# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# include (${PROJECT_SOURCE_DIR}/cmake/libutils.cmake)
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include (${PROJECT_SOURCE_DIR}/cmake/MergeStaticLibs.cmake)
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set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
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@ -76,7 +75,11 @@ target_link_libraries(wallet
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${EXTRA_LIBRARIES})
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set(libs_to_merge wallet cryptonote_core mnemonics common crypto)
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merge_static_libs(wallet_merged "${libs_to_merge}")
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foreach(lib ${libs_to_merge})
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list(APPEND objlibs $<TARGET_OBJECTS:obj_${lib}>) # matches naming convention in src/CMakeLists.txtA
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endforeach()
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add_library(wallet_merged STATIC ${objlibs})
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install(TARGETS wallet_merged
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ARCHIVE DESTINATION lib)
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