f88e9de37a
Several build systems / existing scripts assume that pthread functions are exposed through separate library (`libpthread.so` / `libpthread.a`) and thus use `-lpthread` flag explicitly. Since llvm-libc puts all the pthread functions into the regular `libc`, teach the CMake build rules to produce an empty static archive `libpthread.a` for compatibility purposes.
127 lines
4.2 KiB
CMake
127 lines
4.2 KiB
CMake
set(libc_archive_targets "")
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set(libc_archive_names "")
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set(libc_archive_entrypoint_lists "")
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if(LLVM_LIBC_FULL_BUILD)
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list(APPEND libc_archive_names c m mvec)
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list(APPEND libc_archive_targets libc libm libmvec)
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list(APPEND libc_archive_entrypoint_lists
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TARGET_LIBC_ENTRYPOINTS TARGET_LIBM_ENTRYPOINTS TARGET_LIBMVEC_ENTRYPOINTS)
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else()
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list(APPEND libc_archive_names llvmlibc)
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list(APPEND libc_archive_targets libc)
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list(APPEND libc_archive_entrypoint_lists TARGET_LLVMLIBC_ENTRYPOINTS)
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endif()
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set(added_archive_targets "")
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set(added_bitcode_targets "")
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foreach(archive IN ZIP_LISTS
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libc_archive_names libc_archive_targets libc_archive_entrypoint_lists)
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if(NOT ${archive_2})
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# If an entrypoint list is missing, then skip adding targets for it.
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continue()
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endif()
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add_entrypoint_library(
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${archive_1}
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DEPENDS
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${${archive_2}}
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)
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set_target_properties(
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${archive_1}
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PROPERTIES
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ARCHIVE_OUTPUT_NAME ${archive_0}
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)
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if(LLVM_LIBC_FULL_BUILD)
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target_link_libraries(${archive_1} PUBLIC libc-headers)
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if(TARGET libc-startup)
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add_dependencies(${archive_1} libc-startup)
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endif()
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endif()
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list(APPEND added_archive_targets ${archive_1})
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# Add the offloading version of the library for offloading languages. These
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# are installed in the standard search path separate from the other libraries.
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if(LIBC_TARGET_OS_IS_GPU)
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add_bitcode_entrypoint_library(
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${archive_1}bitcode
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${archive_1}
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DEPENDS
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${${archive_2}}
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)
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set_target_properties(
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${archive_1}bitcode
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PROPERTIES
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OUTPUT_NAME ${archive_1}.bc
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)
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list(APPEND added_bitcode_targets ${archive_1}bitcode)
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endif()
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endforeach()
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install(
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TARGETS ${added_archive_targets}
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ARCHIVE DESTINATION ${LIBC_INSTALL_LIBRARY_DIR}
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COMPONENT libc
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)
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foreach(file ${added_bitcode_targets})
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install(FILES $<TARGET_FILE:${file}>
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DESTINATION ${LIBC_INSTALL_LIBRARY_DIR}
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RENAME $<TARGET_PROPERTY:${file},OUTPUT_NAME>
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COMPONENT libc
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)
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endforeach()
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# Add empty archive libraries for compatibility with systems expecting certain
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# bits of libc to be located in separate files (e.g. libpthread).
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set(added_empty_archives "")
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if(LLVM_LIBC_FULL_BUILD AND ${LIBC_TARGET_OS} STREQUAL "linux")
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list(APPEND libc_empty_archive_names pthread)
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foreach(archive ${libc_empty_archive_names})
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set(empty_archive_path ${LIBC_LIBRARY_DIR}/lib${archive}.a)
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add_custom_command(
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OUTPUT ${empty_archive_path}
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COMMAND ${CMAKE_AR} cqs ${empty_archive_path}
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COMMENT "Creating empty archive ${empty_archive_path}"
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VERBATIM
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)
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install(
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FILES ${empty_archive_path}
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DESTINATION ${LIBC_INSTALL_LIBRARY_DIR}
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COMPONENT libc
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)
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add_custom_target(empty-${archive} ALL DEPENDS ${empty_archive_path})
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list(APPEND added_empty_archives empty-${archive})
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endforeach()
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endif()
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set(startup_target "")
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if(LLVM_LIBC_FULL_BUILD AND NOT LIBC_TARGET_OS_IS_BAREMETAL)
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# For now we will disable libc-startup installation for baremetal. The
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# correct way to do it would be to make a hookable startup for baremetal
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# and install it as part of the libc installation.
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set(startup_target "libc-startup")
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endif()
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set(header_install_target "")
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if(LLVM_LIBC_FULL_BUILD)
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set(header_install_target install-libc-headers)
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endif()
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add_custom_target(install-libc
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DEPENDS ${added_archive_targets}
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${added_bitcode_targets}
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${added_empty_archives}
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${startup_target}
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${header_install_target}
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COMMAND "${CMAKE_COMMAND}"
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-DCMAKE_INSTALL_COMPONENT=libc
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-P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
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add_custom_target(install-libc-stripped
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DEPENDS ${added_archive_targets}
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${added_bitcode_targets}
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${added_empty_archives}
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${startup_target}
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${header_install_target}
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COMMAND "${CMAKE_COMMAND}"
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-DCMAKE_INSTALL_COMPONENT=libc
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-DCMAKE_INSTALL_DO_STRIP=1
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-P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
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