fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
353 lines
10 KiB
CMake
353 lines
10 KiB
CMake
#
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# Copyright 2017 The Abseil Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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include(CMakeParseArguments)
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include(AbseilConfigureCopts)
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include(AbseilDll)
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include(AbseilInstallDirs)
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# The IDE folder for Abseil that will be used if Abseil is included in a CMake
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# project that sets
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# set_property(GLOBAL PROPERTY USE_FOLDERS ON)
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# For example, Visual Studio supports folders.
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set(ABSL_IDE_FOLDER Abseil)
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# absl_cc_library()
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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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# PUBLIC: Add this so that this library will be exported under absl::
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# Also in IDE, target will appear in Abseil folder while non PUBLIC will be in Abseil/internal.
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# TESTONLY: When added, this target will only be built if user passes -DABSL_RUN_TESTS=ON to CMake.
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#
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# Note:
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# By default, absl_cc_library will always create a library named absl_${NAME},
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# and alias target absl::${NAME}. The absl:: form should always be used.
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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
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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 # not "awesome" !
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# PUBLIC
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# )
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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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# DEPS
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# absl::fantastic_lib
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# )
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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;PUBLIC;TESTONLY"
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"NAME"
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"HDRS;SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
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${ARGN}
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)
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if(ABSL_CC_LIB_TESTONLY AND NOT ABSL_RUN_TESTS)
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return()
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endif()
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if(ABSL_ENABLE_INSTALL)
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set(_NAME "${ABSL_CC_LIB_NAME}")
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else()
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set(_NAME "absl_${ABSL_CC_LIB_NAME}")
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endif()
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# Check if this is a header-only library
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# Note that as of February 2019, many popular OS's (for example, Ubuntu
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# 16.04 LTS) only come with cmake 3.5 by default. For this reason, we can't
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# use list(FILTER...)
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set(ABSL_CC_SRCS "${ABSL_CC_LIB_SRCS}")
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foreach(src_file IN LISTS ABSL_CC_SRCS)
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if(${src_file} MATCHES ".*\\.(h|inc)")
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list(REMOVE_ITEM ABSL_CC_SRCS "${src_file}")
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endif()
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endforeach()
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if("${ABSL_CC_SRCS}" STREQUAL "")
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set(ABSL_CC_LIB_IS_INTERFACE 1)
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else()
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set(ABSL_CC_LIB_IS_INTERFACE 0)
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endif()
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# Determine this build target's relationship to the DLL. It's one of four things:
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# 1. "dll" -- This target is part of the DLL
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# 2. "dll_dep" -- This target is not part of the DLL, but depends on the DLL.
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# Note that we assume any target not in the DLL depends on the
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# DLL. This is not a technical necessity but a convenience
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# which happens to be true, because nearly every target is
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# part of the DLL.
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# 3. "shared" -- This is a shared library, perhaps on a non-windows platform
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# where DLL doesn't make sense.
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# 4. "static" -- This target does not depend on the DLL and should be built
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# statically.
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if (${ABSL_BUILD_DLL})
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absl_internal_dll_contains(TARGET ${_NAME} OUTPUT _in_dll)
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if (${_in_dll})
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# This target should be replaced by the DLL
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set(_build_type "dll")
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set(ABSL_CC_LIB_IS_INTERFACE 1)
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else()
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# Building a DLL, but this target is not part of the DLL
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set(_build_type "dll_dep")
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endif()
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elseif(BUILD_SHARED_LIBS)
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set(_build_type "shared")
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else()
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set(_build_type "static")
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endif()
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if(NOT ABSL_CC_LIB_IS_INTERFACE)
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if(${_build_type} STREQUAL "dll_dep")
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# This target depends on the DLL. When adding dependencies to this target,
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# any depended-on-target which is contained inside the DLL is replaced
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# with a dependency on the DLL.
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add_library(${_NAME} STATIC "")
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target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
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absl_internal_dll_targets(
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DEPS ${ABSL_CC_LIB_DEPS}
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OUTPUT _dll_deps
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)
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target_link_libraries(${_NAME}
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PUBLIC ${_dll_deps}
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PRIVATE
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${ABSL_CC_LIB_LINKOPTS}
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${ABSL_DEFAULT_LINKOPTS}
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)
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if (ABSL_CC_LIB_TESTONLY)
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set(_gtest_link_define "GTEST_LINKED_AS_SHARED_LIBRARY=1")
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else()
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set(_gtest_link_define)
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endif()
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target_compile_definitions(${_NAME}
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PUBLIC
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ABSL_CONSUME_DLL
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"${_gtest_link_define}"
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)
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elseif(${_build_type} STREQUAL "static" OR ${_build_type} STREQUAL "shared")
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add_library(${_NAME} "")
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target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
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target_link_libraries(${_NAME}
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PUBLIC ${ABSL_CC_LIB_DEPS}
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PRIVATE
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${ABSL_CC_LIB_LINKOPTS}
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${ABSL_DEFAULT_LINKOPTS}
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)
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else()
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message(FATAL_ERROR "Invalid build type: ${_build_type}")
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endif()
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# Linker language can be inferred from sources, but in the case of DLLs we
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# don't have any .cc files so it would be ambiguous. We could set it
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# explicitly only in the case of DLLs but, because "CXX" is always the
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# correct linker language for static or for shared libraries, we set it
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# unconditionally.
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set_property(TARGET ${_NAME} PROPERTY LINKER_LANGUAGE "CXX")
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target_include_directories(${_NAME}
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PUBLIC
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"$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
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$<INSTALL_INTERFACE:${ABSL_INSTALL_INCLUDEDIR}>
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)
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target_compile_options(${_NAME}
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PRIVATE ${ABSL_CC_LIB_COPTS})
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target_compile_definitions(${_NAME} PUBLIC ${ABSL_CC_LIB_DEFINES})
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# Add all Abseil targets to a a folder in the IDE for organization.
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if(ABSL_CC_LIB_PUBLIC)
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set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER})
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elseif(ABSL_CC_LIB_TESTONLY)
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set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
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else()
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set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/internal)
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endif()
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# INTERFACE libraries can't have the CXX_STANDARD property set
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set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD ${ABSL_CXX_STANDARD})
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set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
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# When being installed, we lose the absl_ prefix. We want to put it back
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# to have properly named lib files. This is a no-op when we are not being
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# installed.
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if(ABSL_ENABLE_INSTALL)
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set_target_properties(${_NAME} PROPERTIES
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OUTPUT_NAME "absl_${_NAME}"
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)
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endif()
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else()
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# Generating header-only library
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add_library(${_NAME} INTERFACE)
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target_include_directories(${_NAME}
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INTERFACE
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"$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
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$<INSTALL_INTERFACE:${ABSL_INSTALL_INCLUDEDIR}>
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)
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if (${_build_type} STREQUAL "dll")
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set(ABSL_CC_LIB_DEPS abseil_dll)
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endif()
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target_link_libraries(${_NAME}
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INTERFACE
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${ABSL_CC_LIB_DEPS}
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${ABSL_CC_LIB_LINKOPTS}
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${ABSL_DEFAULT_LINKOPTS}
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)
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target_compile_definitions(${_NAME} INTERFACE ${ABSL_CC_LIB_DEFINES})
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endif()
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# TODO currently we don't install googletest alongside abseil sources, so
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# installed abseil can't be tested.
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if(NOT ABSL_CC_LIB_TESTONLY AND ABSL_ENABLE_INSTALL)
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install(TARGETS ${_NAME} EXPORT ${PROJECT_NAME}Targets
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RUNTIME DESTINATION ${ABSL_INSTALL_BINDIR}
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LIBRARY DESTINATION ${ABSL_INSTALL_LIBDIR}
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ARCHIVE DESTINATION ${ABSL_INSTALL_LIBDIR}
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)
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endif()
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add_library(absl::${ABSL_CC_LIB_NAME} ALIAS ${_NAME})
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endfunction()
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# absl_cc_test()
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#
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# CMake function to imitate Bazel's cc_test rule.
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#
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# Parameters:
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# NAME: name of target (see Usage below)
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# SRCS: List of source files for the binary
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# DEPS: List of other libraries to be linked in to the binary targets
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# COPTS: List of private compile options
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# DEFINES: List of public defines
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# LINKOPTS: List of link options
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#
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# Note:
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# By default, absl_cc_test will always create a binary named absl_${NAME}.
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# This will also add it to ctest list as absl_${NAME}.
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#
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# Usage:
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# absl_cc_library(
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# NAME
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# awesome
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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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# PUBLIC
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# )
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#
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# absl_cc_test(
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# NAME
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# awesome_test
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# SRCS
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# "awesome_test.cc"
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# DEPS
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# absl::awesome
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# gmock
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# gtest_main
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# )
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function(absl_cc_test)
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if(NOT ABSL_RUN_TESTS)
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return()
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endif()
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cmake_parse_arguments(ABSL_CC_TEST
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""
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"NAME"
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"SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
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${ARGN}
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)
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set(_NAME "absl_${ABSL_CC_TEST_NAME}")
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add_executable(${_NAME} "")
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target_sources(${_NAME} PRIVATE ${ABSL_CC_TEST_SRCS})
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target_include_directories(${_NAME}
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PUBLIC ${ABSL_COMMON_INCLUDE_DIRS}
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PRIVATE ${GMOCK_INCLUDE_DIRS} ${GTEST_INCLUDE_DIRS}
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)
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if (${ABSL_BUILD_DLL})
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target_compile_definitions(${_NAME}
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PUBLIC
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${ABSL_CC_TEST_DEFINES}
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ABSL_CONSUME_DLL
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GTEST_LINKED_AS_SHARED_LIBRARY=1
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)
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# Replace dependencies on targets inside the DLL with abseil_dll itself.
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absl_internal_dll_targets(
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DEPS ${ABSL_CC_TEST_DEPS}
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OUTPUT ABSL_CC_TEST_DEPS
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)
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else()
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target_compile_definitions(${_NAME}
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PUBLIC
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${ABSL_CC_TEST_DEFINES}
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)
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endif()
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target_compile_options(${_NAME}
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PRIVATE ${ABSL_CC_TEST_COPTS}
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)
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target_link_libraries(${_NAME}
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PUBLIC ${ABSL_CC_TEST_DEPS}
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PRIVATE ${ABSL_CC_TEST_LINKOPTS}
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)
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# Add all Abseil targets to a folder in the IDE for organization.
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set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
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set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD ${ABSL_CXX_STANDARD})
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set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
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add_test(NAME ${_NAME} COMMAND ${_NAME})
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endfunction()
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function(check_target my_target)
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if(NOT TARGET ${my_target})
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message(FATAL_ERROR " ABSL: compiling absl requires a ${my_target} CMake target in your project,
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see CMake/README.md for more details")
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endif(NOT TARGET ${my_target})
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endfunction()
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