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@ -62,7 +62,114 @@ function(absl_library) |
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endif() |
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endfunction() |
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# |
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# CMake function to imitate Bazel's cc_library rule. |
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# |
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# Parameters: |
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# NAME: name of target (see Note) |
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# HDRS: List of public header files for the library |
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# SRCS: List of source files for the library |
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# DEPS: List of other libraries to be linked in to the binary targets |
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# COPTS: List of private compile options |
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# DEFINES: List of public defines |
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# LINKOPTS: List of link options |
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# VISIBILITY_PUBLIC: Add this so that this library will be exported under absl:: (see Note). |
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# TESTONLY: When added, this target will only be built if user passes -DBUILD_TESTING=ON to CMake. |
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# |
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# Note: |
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# |
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# By default, absl_cc_library will always create a library named absl_${NAME}, |
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# which means other targets can only depend this library as absl_${NAME}, not ${NAME}. |
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# This is to reduce namespace pollution. |
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# |
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# absl_cc_library( |
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# NAME |
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# awesome_lib |
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# HDRS |
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# "a.h" |
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# SRCS |
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# "a.cc" |
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# ) |
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# absl_cc_library( |
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# NAME |
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# fantastic_lib |
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# SRCS |
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# "b.cc" |
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# DEPS |
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# absl_awesome_lib # not "awesome_lib"! |
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# ) |
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# |
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# If VISIBILITY_PUBLIC is set, absl_cc_library will also create an alias absl::${NAME} |
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# for public use. |
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# |
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# absl_cc_library( |
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# NAME |
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# main_lib |
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# ... |
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# VISIBILITY_PUBLIC |
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# ) |
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# |
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# User can then use the library as absl::main_lib (although absl_main_lib is defined too). |
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# |
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# TODO: Implement "ALWAYSLINK" |
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function(absl_cc_library) |
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cmake_parse_arguments(ABSL_CC_LIB |
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"DISABLE_INSTALL;VISIBILITY_PUBLIC;TESTONLY" |
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"NAME" |
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"HDRS;SRCS;COPTS;DEFINES;LINKOPTS;DEPS" |
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${ARGN} |
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) |
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if (NOT ABSL_CC_LIB_TESTONLY OR BUILD_TESTING) |
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set(_NAME "absl_${ABSL_CC_LIB_NAME}") |
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string(TOUPPER ${_NAME} _UPPER_NAME) |
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# Check if this is a header-only library |
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if (ABSL_CC_LIB_SRCS) |
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set(_SRCS ${ABSL_CC_LIB_SRCS}) |
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list(FILTER _SRCS INCLUDE REGEX "\.cc$") |
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list(LENGTH _SRCS ABSL_CC_LIB_SRCS_LEN) |
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else() |
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set(ABSL_CC_LIB_SRCS_LEN 0) |
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endif() |
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if(ABSL_CC_LIB_SRCS_LEN) |
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add_library(${_NAME} STATIC ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS}) |
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else() |
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set(__dummy_header_only_lib_file "${CMAKE_CURRENT_BINARY_DIR}/${_NAME}_header_only_dummy.cc") |
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if(NOT EXISTS ${__dummy_header_only_lib_file}) |
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file(WRITE ${__dummy_header_only_lib_file} |
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"/* generated file for header-only cmake target */ |
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namespace absl { |
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// single meaningless symbol |
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void ${_NAME}__header_fakesym() {} |
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} // namespace absl") |
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endif() |
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add_library(${_NAME} ${__dummy_header_only_lib_file} ${ABSL_CC_LIB_HDRS}) |
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endif() |
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target_compile_options(${_NAME} PRIVATE ${ABSL_COMPILE_CXXFLAGS} ${ABSL_CC_LIB_COPTS}) |
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target_link_libraries(${_NAME} |
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PUBLIC ${ABSL_CC_LIB_DEPS} |
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PRIVATE ${ABSL_CC_LIB_LINKOPTS} |
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) |
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target_compile_definitions(${_NAME} PUBLIC ${ABSL_CC_LIB_DEFINES}) |
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target_include_directories(${_NAME} |
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PUBLIC ${ABSL_COMMON_INCLUDE_DIRS} |
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) |
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# Add all Abseil targets to a a folder in the IDE for organization. |
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set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}) |
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if(ABSL_CC_LIB_VISIBILITY_PUBLIC) |
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add_library(absl::${ABSL_CC_LIB_NAME} ALIAS ${_NAME}) |
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endif() |
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endif() |
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endfunction() |
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# |
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# header only virtual target creation |
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Loo Rong Jie
7 years ago