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CMake附加来自不同CmakeList的对象。txt到一个库中

unix-ar linker cmake build

4

Rakib · 技术社区 · 6 年前

我想从多个子目录中的对象创建一个库,每个子目录都包含自己的CmakeList。txt和对象库技巧,使多个目标具有不同的编译选项。

以下是文件:

project_dir
|--- subdir1
|    |--- src1.c
|    |--- CMakeLists.txt
|--- subdir2
|    |--- src2.c
|    |--- CMakeLists.txt
|--- CMakeLists.txt

所有CMakeLists的内容。txt文件

// project_dir/CMakeLists.txt
// what to put here? to make one single library (mainLib)


// project_dir/subdir1/CMakeLists.txt
add_library(lib11 OBJECT src1.c)
set_target_properties(lib11 PROPERTIES COMPILE_FLAGS "some-flags11")

add_library(lib12 OBJECT src1.c)
set_target_properties(lib12 PROPERTIES COMPILE_FLAGS "some-flags12")
// here I would like to add lib11:objects and lib12:objects to mainLib
// how should it be done?

// project_dir/subdir2/CMakeLists.txt
// *** similar to subdir1 but with src2.c that creates lib21 and lib22
// here I would like to add lib21:objects and lib22:objects to mainLib
// how should it be done?

是否可以在平台上独立完成?谢谢

编辑: 基于 CMake: how create a single shared library from all static libraries of subprojects? ,我可以将cmake文件更改为以下内容,但仍然无法解决我的问题。

// project_dir/subdir1/CMakeLists.txt
add_library(lib11 OBJECT src1.c)
set_target_properties(lib11 PROPERTIES COMPILE_FLAGS "some-flags11")

add_library(lib12 OBJECT src1.c)
set_target_properties(lib12 PROPERTIES COMPILE_FLAGS "some-flags12")

add_library(lib1 STATIC $<TARGET_OBJECTS:lib11> $<TARGET_OBJECTS:lib12>)

// Above add_library cannot be OBJECT which would fix my problem.
// how to append the lib1 (lib11 and lib12) to mainLib?

编辑: 更新我的帖子,尝试按照答案中的建议链接接口库。

add_library(lib11 OBJECT test1/sub1/src1.c)
set_target_properties(lib11 PROPERTIES COMPILE_FLAGS "-DF1")

add_library(lib12 OBJECT test1/sub1/src1.c)
set_target_properties(lib12 PROPERTIES COMPILE_FLAGS "-DF2")

add_library(lib1 INTERFACE)
target_sources(lib1 INTERFACE $<TARGET_OBJECTS:lib11>)
target_sources(lib1 INTERFACE $<TARGET_OBJECTS:lib12>)

add_library(lib21 OBJECT test1/sub2/src2.c)
set_target_properties(lib21 PROPERTIES COMPILE_FLAGS "-DF1")

add_library(lib22 OBJECT test1/sub2/src2.c)
set_target_properties(lib22 PROPERTIES COMPILE_FLAGS "-DF2")

add_library(lib2 INTERFACE)
target_sources(lib2 INTERFACE $<TARGET_OBJECTS:lib21>)
target_sources(lib2 INTERFACE $<TARGET_OBJECTS:lib22>)

add_library(PARENT INTERFACE)

target_link_libraries(PARENT INTERFACE lib1)
target_link_libraries(PARENT INTERFACE lib2)

add_library(CORE OBJECT src.c)
add_library(GPARENT STATIC $<TARGET_OBJECTS:CORE>)

target_link_libraries(GPARENT INTERFACE PARENT)

2 回复 | 直到 6 年前

1

8

Tsyvarev 4 年前

几个对象库可以合并到一个接口图书馆:

# Create lib1 OBJECT library with some sources, compile flags and so.
add_library(lib1 OBJECT ...)

# Create lib2 OBJECT library with some sources, compile flags and so.
add_library(lib2 OBJECT ...)

# Create INTERFACE library..
add_library(libs INTERFACE)
# .. which combines OBJECT libraries
target_sources(libs INTERFACE $<TARGET_OBJECTS:lib1> $<TARGET_OBJECTS:lib2>)

生成的库可用于标准 target_link_libraries :

add_library(mainLib <some-source>)
target_link_libraries(mainLib libs)

可以组合接口图书馆进一步:

# Create libs_another INTERFACE library like 'libs' one
add_library(libs_another INTERFACE)
..

# Combine 'libs' and 'libs_another' together
add_library(upper_level_libs INTERFACE)
target_link_libraries(upper_level_libs INTERFACE libs libs_another)

结果库的“链”可以是任意长度。

虽然这种组合对象库的方式看起来很粗糙,但实际上 CMake documentation :

虽然在调用 target_link_libraries() 命令,可以使用 接口库 谁的 INTERFACE\u源 目标属性设置为名称 $<TARGET_OBJECTS:objlib> 。

2

0

Wiki Wang 5 年前

我只是使用 set 具有 PARENT_SCOPE 。

根CMakeLists。txt文件:

set(OBJECTS)

add_subdirectory(lib1)
add_subdirectory(lib2)

add_library(lib STATIC ${OBJECTS})

CMakeLists。子目录中的txt:

add_subdirectory(lib11)

add_library(${PROJECT_NAME} OBJECT src1.c)
list(APPEND OBJECTS $<TARGET_OBJECTS:${PROJECT_NAME}>)
set(OBJECTS ${OBJECTS} PARENT_SCOPE)