CMAKE 没有为内部共享库制定目标的规则

Question

我写了一个 cmake 文件，它构建了两个共享库 vector3.c 和 matrix4.c matrix4 取决于 vector3，如果我运行我的 cmake 项目并且只构建它构建的 vector3 共享库就好了，当我添加 matrix4 共享库时我得到一个 cmake 错误。没有制定目标的规则。

文件夹结构

core_math
 ------CMakeLists.txt
-common/
 ------common_structs.h
-matrix4/
 ------CMakeLists.txt
 ------matrix4/src/matrix4_scalar.c
 ------matrix4/headers/matrix4_scalar.h
-vector3/
-------CMakeLists.txt
-------vector3/src/vector3_scalar.c
-------vector3/headers/vector3_scalar.h

core_math/CMakeLists.txt

PROJECT(core_math)
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)

ADD_SUBDIRECTORY(vector3_scalar)
ADD_SUBDIRECTORY(matrix4_scalar)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY $(CMAKE_BINARY_DIR)/static_lib)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY $(CMAKE_BINARY_DIR)/shared_lib)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY $(CMAKE_BINARY_DIR)/bin)

SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake_modules)

core_math/vector3/CMakeLists.txt

PROJECT(vector3_scalar)
SET(CMAKE_MACOSX_RPATH 1)

INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/../common)

SET(HEADER_FILES ${CMAKE_CURRENT_SOURCE_DIR}/../common/common_structs.h) 
SET(SRC_FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/vector3_scalar.c ${HEADER_FILES})

ADD_LIBRARY(vector3_scalar SHARED ${SRC_FILES})

core_math/matrix4_scalar/CMakeLists.txt

PROJECT(matrix4_scalar)
SET(CMAKE_MACOSX_RPATH 1)

INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/../common 
    ${CMAKE_CURRENT_SOURCE_DIR}/../vector3_scalar)


SET(HEADER_FILES ${CMAKE_CURRENT_SOURCE_DIR}/../common/common_structs.h
    ${CMAKE_CURRENT_SOURCE_DIR}/../vector3_scalar/headers/vector3_scalar.h
    ${CMAKE_CURRENT_SOURCE_DIR}/headers/matrix4_scalar.h)
SET(SRC_FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/matrix4_scalar.c ${HEADER_FILES})

ADD_LIBRARY(matrix4_scalar SHARED ${SRC_FILES})

TARGET_LINK_LIBRARIES(matrix4_scalar vector3_scalar)

构建错误

-- Build files have been written to: /Users/blubee/MATH/project/build
Scanning dependencies of target vector3_scalar
[ 25%] Building C object source/core_math/vector3_scalar/CMakeFiles/vector3_scalar.dir/sr
c/vector3_scalar.c.o
[ 50%] Linking C shared library $(CMAKE_BINARY_DIR)/lib/libvector3_scalar.dylib
[ 50%] Built target vector3_scalar
Scanning dependencies of target matrix4_scalar
[ 75%] Building C object source/core_math/matrix4_scalar/CMakeFiles/matrix4_scalar.dir/sr
c/matrix4_scalar.c.o
make[2]: *** No rule to make target `source/core_math/vector3_scalar//Users/blubee/MATH/pr
oject/build/lib/libvector3_scalar.dylib', needed by `source/core_math/matrix4_scalar//Use
rs/blubee/MATH/project/build/lib/libmatrix4_scalar.dylib'.  Stop.
make[1]: *** [source/core_math/matrix4_scalar/CMakeFiles/matrix4_scalar.dir/all] Error 2
make: *** [all] Error 2

如果我从 matrix4_scalar cmakelists.txt 文件中删除 target_link_libraries，则会出现未定义符号错误。

Undefined symbols for architecture x86_64:
  "_vec3_deg2rad", referenced from:
      _mat4_rotate in matrix4_scalar.c.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [source/core_math/matrix4_scalar//Users/blubee/MATH/project/build/lib/libmatr
ix4_scalar.dylib] Error 1
make[1]: *** [source/core_math/matrix4_scalar/CMakeFiles/matrix4_scalar.dir/all] Error 2
make: *** [all] Error 2

Answer 1

我已经对您的代码进行了一些测试，可以重现该问题。

这与在 SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY ...) 命令中使用 $(...) 括号对变量取消引用有关。我已将 $(CMAKE_BINARY_DIR) 更改为 ${CMAKE_BINARY_DIR} 并且一切正常：

> cmake --build .
-- Configuring done
-- Generating done
-- Build files have been written to: build
Scanning dependencies of target vector3_scalar
[ 25%] Building C object vector3_scalar/CMakeFiles/vector3_scalar.dir/src/vector3_scalar.c.o
[ 50%] Linking C shared library ../shared_lib/libvector3_scalar.dylib
[ 50%] Built target vector3_scalar
Scanning dependencies of target matrix4_scalar
[ 75%] Building C object matrix4_scalar/CMakeFiles/matrix4_scalar.dir/src/matrix4_scalar.c.o
[100%] Linking C shared library ../shared_lib/libmatrix4_scalar.dylib
[100%] Built target matrix4_scalar

参考资料

[CMake] Trouble setting LIBRARY_OUTPUT_DIRECTORY
Custom Directory for CMake Library Output

CMAKE 没有为内部共享库制定目标的规则

CMAKE no rule to make target for internal shared library

c

cmake

shared-libraries

libraries