检测 cmake 文件中的编译器配置
Detecting compiler configuration in cmake file
要么这真的很简单，但我只是找不到正确的方法，要么我完全误解了某些东西。我正在尝试向 CMakeLists.txt 文件添加条件以包含正确的 .lib 文件，具体取决于正在使用的构建配置类型（目前在 visual studio 内）。因此，例如，如果 visual studio 中的配置设置为 Debug，则使用文件 zlibstaticd.lib 与 zlibstatic.lib。以下是我所拥有的不起作用的东西：
add_library(ZLIB_LIBRARY OBJECT IMPORTED)
# zlib added via assimp, and I can't get CMAKE_DEBUG_POSTFIX value to overwrite (because it's set within zlibs cmake file when using MSVC)
# so we have to do this check
if($<CONFIG:Debug>)
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib)
else()
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib)
endif()
我也试过 CMAKE_BUILD_TYPE 但它始终是一个空字符串。下面是我的整个 CMakeLists.txt 文件，因此您可以看到我在做什么（构建一个包含许多其他静态库的单一静态库）：
cmake_minimum_required(VERSION 3.20.0)
# Define our project name
set(PROJECT_NAME myProjectName)
project(${PROJECT_NAME})
# Make sure binary directory is not the same as source directory
if(PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
message(
FATAL_ERROR
"In-source builds not allowed. Please make a new directory (called a build directory) and run CMake from there."
)
endif()
# This Project Depends on External Project(s)
include(ExternalProject)
set(libGLFW glfw)
ExternalProject_Add(${libGLFW}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLFW}
GIT_REPOSITORY https://github.com/glfw/glfw.git
GIT_TAG 3.3.4
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLFW}/install
-DGLFW_BUILD_DOCS:BOOL=OFF
-DGLFW_BUILD_EXAMPLES:BOOL=OFF
-DGLFW_BUILD_TESTS:BOOL=OFF
)
set(libGLAD glad)
ExternalProject_Add(${libGLAD}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLAD}
GIT_REPOSITORY https://github.com/Dav1dde/glad.git
GIT_TAG origin/master
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLAD}/install
-DGLAD_INSTALL:BOOL=ON
-DGLAD_PROFILE:STRING="core"
-DGLAD_ALL_EXTENSIONS:BOOL=ON
-DUSE_MSVC_RUNTIME_LIBRARY_DLL:BOOL=OFF
)
set(libGLM glm)
ExternalProject_Add(${libGLM}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLM}
GIT_REPOSITORY https://github.com/g-truc/glm.git
GIT_TAG origin/master
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLM}/install
-DBUILD_SHARED_LIBS:BOOL=OFF
-DBUILD_STATIC_LIBS:BOOL=OFF
-DGLM_TEST_ENABLE:BOOL=OFF
)
set(libAssimp assimp)
ExternalProject_Add(${libAssimp}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libAssimp}
GIT_REPOSITORY https://github.com/assimp/assimp.git
GIT_TAG v5.0.1
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libAssimp}/install
-DASSIMP_BUILD_ALL_IMPORTERS_BY_DEFAULT:BOOL=OFF
-DASSIMP_BUILD_ALL_EXPORTERS_BY_DEFAULT:BOOL=OFF
-DBUILD_SHARED_LIBS:BOOL=OFF
-DASSIMP_BUILD_ASSIMP_TOOLS:BOOL=OFF
-DASSIMP_BUILD_TESTS:BOOL=OFF
-DASSIMP_BUILD_FBX_IMPORTER:BOOL=ON
-DASSIMP_BUILD_OBJ_IMPORTER:BOOL=ON
-DASSIMP_BUILD_OBJ_EXPORTER:BOOL=ON
-DASSIMP_LIBRARY_SUFFIX:STRING=
-DLIBRARY_SUFFIX:STRING=
-DCMAKE_DEBUG_POSTFIX:STRING=
-DASSIMP_INJECT_DEBUG_POSTFIX:BOOL=OFF
)
# Note set_target_properties will need conditionals for windows/linux since extensions differ
# Create the oject files we will join together to create our singular static library, using the projects
# that were previously added above via ExternalProject_Add
# INSTALL_DIR not being set to value of CMAKE_INSTALL_PREFIX, so manuallysetting
#ExternalProject_Get_Property(${libGLFW} INSTALL_DIR)
# SETUP GLFW
set(GLFW_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLFW}/install)
add_library(GLFW_LIBRARY OBJECT IMPORTED)
set_target_properties(GLFW_LIBRARY PROPERTIES IMPORTED_OBJECTS ${GLFW_INSTALL_DIR}/lib/glfw3.lib)
# SETUP GLAD
set(GLAD_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLAD}/install)
add_library(GLAD_LIBRARY OBJECT IMPORTED)
set_target_properties(GLAD_LIBRARY PROPERTIES IMPORTED_OBJECTS ${GLAD_INSTALL_DIR}/lib/glad.lib)
# SETUP GLM
# GLM is header only library, so we simply include it's include directory in target_include_directories below
set(GLM_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLM}/install)
# SETUP ASSIMP and it's dependencies
set(ASSIMP_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libAssimp}/install)
add_library(ASSIMP_LIBRARY OBJECT IMPORTED)
set_target_properties(ASSIMP_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/assimp.lib)
add_library(IRRXML_LIBRARY OBJECT IMPORTED)
set_target_properties(IRRXML_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/IrrXML.lib)
add_library(ZLIB_LIBRARY OBJECT IMPORTED)
# zlib added via assimp, and I can't get CMAKE_DEBUG_POSTFIX value to overwrite (because it's set within zlibs cmake file when using MSVC)
# so we have to do this check
if($<CONFIG:Debug>)
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib)
else()
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib)
endif()
# Documentation states not to do this, but do it anyway for the time being since it prevents us from having
# to manually list all project files
file(GLOB_RECURSE headers CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/inc/*.h")
file(GLOB_RECURSE sources CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
# Create a single .lib file containing our compiled objects, and the compiled objects of all other dependencies
add_library(${PROJECT_NAME} STATIC ${headers} ${sources}
$<TARGET_OBJECTS:GLFW_LIBRARY>
$<TARGET_OBJECTS:GLAD_LIBRARY>
$<TARGET_OBJECTS:ASSIMP_LIBRARY>
$<TARGET_OBJECTS:IRRXML_LIBRARY>
$<TARGET_OBJECTS:ZLIB_LIBRARY>
)
# Add all include file paths
target_include_directories(${PROJECT_NAME}
PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/inc
PUBLIC ${GLFW_INSTALL_DIR}/include
PUBLIC ${GLAD_INSTALL_DIR}/include
PUBLIC ${GLM_INSTALL_DIR}/include
PUBLIC ${ASSIMP_INSTALL_DIR}/include
)
# Specify the order in which libs depend on each other, use the name of the ExternalProject, not the name of the
# library object you create and use with add_library
add_dependencies(${PROJECT_NAME} ${libGLFW} ${libGLAD} ${libGLM} ${libAssimp})
add_library(ZLIB_LIBRARY OBJECT IMPORTED)
# zlib added via assimp, and I can't get CMAKE_DEBUG_POSTFIX value to overwrite (because it's set within zlibs cmake file when using MSVC)
# so we have to do this check
if($<CONFIG:Debug>)
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib)
else()
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib)
endif()
生成器表达式在 配置步骤 运行 之后计算，因此当 if() 语句看到它们时，它们只是文字字符串。基本上，CMake 配置步骤是 元编程 一种目标和生成器表达式的声明性语言，通过发电机。
您可以按如下方式设置库：
add_library(zlib OBJECT IMPORTED)
set_target_properties(
zlib
PROPERTIES
IMPORTED_OBJECTS_RELEASE "${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib"
IMPORTED_OBJECTS_DEBUG "${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib"
)
CMake 在解析库路径时首先尝试 IMPORTED_OBJECTS_$<CONFIG>，然后再尝试 IMPORTED_OBJECTS。
综上所述，我想知道您为什么不只使用 find_package、vcpkg、Conan 或 add_subdirectory / FetchContent 来管理您的依赖项。 这似乎很痛苦，因为所有这些库（我认为）要么提供自己的 find_package 配置包，要么 CMake 为它们提供一个查找模块。
要么这真的很简单，但我只是找不到正确的方法，要么我完全误解了某些东西。我正在尝试向 CMakeLists.txt 文件添加条件以包含正确的 .lib 文件，具体取决于正在使用的构建配置类型（目前在 visual studio 内）。因此，例如，如果 visual studio 中的配置设置为 Debug，则使用文件 zlibstaticd.lib 与 zlibstatic.lib。以下是我所拥有的不起作用的东西：
add_library(ZLIB_LIBRARY OBJECT IMPORTED)
# zlib added via assimp, and I can't get CMAKE_DEBUG_POSTFIX value to overwrite (because it's set within zlibs cmake file when using MSVC)
# so we have to do this check
if($<CONFIG:Debug>)
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib)
else()
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib)
endif()
我也试过 CMAKE_BUILD_TYPE 但它始终是一个空字符串。下面是我的整个 CMakeLists.txt 文件，因此您可以看到我在做什么（构建一个包含许多其他静态库的单一静态库）：
cmake_minimum_required(VERSION 3.20.0)
# Define our project name
set(PROJECT_NAME myProjectName)
project(${PROJECT_NAME})
# Make sure binary directory is not the same as source directory
if(PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
message(
FATAL_ERROR
"In-source builds not allowed. Please make a new directory (called a build directory) and run CMake from there."
)
endif()
# This Project Depends on External Project(s)
include(ExternalProject)
set(libGLFW glfw)
ExternalProject_Add(${libGLFW}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLFW}
GIT_REPOSITORY https://github.com/glfw/glfw.git
GIT_TAG 3.3.4
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLFW}/install
-DGLFW_BUILD_DOCS:BOOL=OFF
-DGLFW_BUILD_EXAMPLES:BOOL=OFF
-DGLFW_BUILD_TESTS:BOOL=OFF
)
set(libGLAD glad)
ExternalProject_Add(${libGLAD}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLAD}
GIT_REPOSITORY https://github.com/Dav1dde/glad.git
GIT_TAG origin/master
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLAD}/install
-DGLAD_INSTALL:BOOL=ON
-DGLAD_PROFILE:STRING="core"
-DGLAD_ALL_EXTENSIONS:BOOL=ON
-DUSE_MSVC_RUNTIME_LIBRARY_DLL:BOOL=OFF
)
set(libGLM glm)
ExternalProject_Add(${libGLM}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLM}
GIT_REPOSITORY https://github.com/g-truc/glm.git
GIT_TAG origin/master
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLM}/install
-DBUILD_SHARED_LIBS:BOOL=OFF
-DBUILD_STATIC_LIBS:BOOL=OFF
-DGLM_TEST_ENABLE:BOOL=OFF
)
set(libAssimp assimp)
ExternalProject_Add(${libAssimp}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dep/${libAssimp}
GIT_REPOSITORY https://github.com/assimp/assimp.git
GIT_TAG v5.0.1
GIT_SHALLOW ON
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/dep/${libAssimp}/install
-DASSIMP_BUILD_ALL_IMPORTERS_BY_DEFAULT:BOOL=OFF
-DASSIMP_BUILD_ALL_EXPORTERS_BY_DEFAULT:BOOL=OFF
-DBUILD_SHARED_LIBS:BOOL=OFF
-DASSIMP_BUILD_ASSIMP_TOOLS:BOOL=OFF
-DASSIMP_BUILD_TESTS:BOOL=OFF
-DASSIMP_BUILD_FBX_IMPORTER:BOOL=ON
-DASSIMP_BUILD_OBJ_IMPORTER:BOOL=ON
-DASSIMP_BUILD_OBJ_EXPORTER:BOOL=ON
-DASSIMP_LIBRARY_SUFFIX:STRING=
-DLIBRARY_SUFFIX:STRING=
-DCMAKE_DEBUG_POSTFIX:STRING=
-DASSIMP_INJECT_DEBUG_POSTFIX:BOOL=OFF
)
# Note set_target_properties will need conditionals for windows/linux since extensions differ
# Create the oject files we will join together to create our singular static library, using the projects
# that were previously added above via ExternalProject_Add
# INSTALL_DIR not being set to value of CMAKE_INSTALL_PREFIX, so manuallysetting
#ExternalProject_Get_Property(${libGLFW} INSTALL_DIR)
# SETUP GLFW
set(GLFW_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLFW}/install)
add_library(GLFW_LIBRARY OBJECT IMPORTED)
set_target_properties(GLFW_LIBRARY PROPERTIES IMPORTED_OBJECTS ${GLFW_INSTALL_DIR}/lib/glfw3.lib)
# SETUP GLAD
set(GLAD_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLAD}/install)
add_library(GLAD_LIBRARY OBJECT IMPORTED)
set_target_properties(GLAD_LIBRARY PROPERTIES IMPORTED_OBJECTS ${GLAD_INSTALL_DIR}/lib/glad.lib)
# SETUP GLM
# GLM is header only library, so we simply include it's include directory in target_include_directories below
set(GLM_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libGLM}/install)
# SETUP ASSIMP and it's dependencies
set(ASSIMP_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/dep/${libAssimp}/install)
add_library(ASSIMP_LIBRARY OBJECT IMPORTED)
set_target_properties(ASSIMP_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/assimp.lib)
add_library(IRRXML_LIBRARY OBJECT IMPORTED)
set_target_properties(IRRXML_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/IrrXML.lib)
add_library(ZLIB_LIBRARY OBJECT IMPORTED)
# zlib added via assimp, and I can't get CMAKE_DEBUG_POSTFIX value to overwrite (because it's set within zlibs cmake file when using MSVC)
# so we have to do this check
if($<CONFIG:Debug>)
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib)
else()
set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib)
endif()
# Documentation states not to do this, but do it anyway for the time being since it prevents us from having
# to manually list all project files
file(GLOB_RECURSE headers CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/inc/*.h")
file(GLOB_RECURSE sources CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
# Create a single .lib file containing our compiled objects, and the compiled objects of all other dependencies
add_library(${PROJECT_NAME} STATIC ${headers} ${sources}
$<TARGET_OBJECTS:GLFW_LIBRARY>
$<TARGET_OBJECTS:GLAD_LIBRARY>
$<TARGET_OBJECTS:ASSIMP_LIBRARY>
$<TARGET_OBJECTS:IRRXML_LIBRARY>
$<TARGET_OBJECTS:ZLIB_LIBRARY>
)
# Add all include file paths
target_include_directories(${PROJECT_NAME}
PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/inc
PUBLIC ${GLFW_INSTALL_DIR}/include
PUBLIC ${GLAD_INSTALL_DIR}/include
PUBLIC ${GLM_INSTALL_DIR}/include
PUBLIC ${ASSIMP_INSTALL_DIR}/include
)
# Specify the order in which libs depend on each other, use the name of the ExternalProject, not the name of the
# library object you create and use with add_library
add_dependencies(${PROJECT_NAME} ${libGLFW} ${libGLAD} ${libGLM} ${libAssimp})
add_library(ZLIB_LIBRARY OBJECT IMPORTED) # zlib added via assimp, and I can't get CMAKE_DEBUG_POSTFIX value to overwrite (because it's set within zlibs cmake file when using MSVC) # so we have to do this check if($<CONFIG:Debug>) set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib) else() set_target_properties(ZLIB_LIBRARY PROPERTIES IMPORTED_OBJECTS ${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib) endif()
生成器表达式在 配置步骤 运行 之后计算，因此当 if() 语句看到它们时，它们只是文字字符串。基本上，CMake 配置步骤是 元编程 一种目标和生成器表达式的声明性语言，通过发电机。
您可以按如下方式设置库：
add_library(zlib OBJECT IMPORTED)
set_target_properties(
zlib
PROPERTIES
IMPORTED_OBJECTS_RELEASE "${ASSIMP_INSTALL_DIR}/lib/zlibstatic.lib"
IMPORTED_OBJECTS_DEBUG "${ASSIMP_INSTALL_DIR}/lib/zlibstaticd.lib"
)
CMake 在解析库路径时首先尝试 IMPORTED_OBJECTS_$<CONFIG>，然后再尝试 IMPORTED_OBJECTS。
综上所述，我想知道您为什么不只使用 find_package、vcpkg、Conan 或 add_subdirectory / FetchContent 来管理您的依赖项。 这似乎很痛苦，因为所有这些库（我认为）要么提供自己的 find_package 配置包，要么 CMake 为它们提供一个查找模块。