CMake：如何在目标之间重用源文件定义而不重复？

Question

在我的 CMake 项目中，我有 2 个共享相同源代码文件的目标（静态库和共享库），如下所示：

add_library("${PROJECT_NAME}" STATIC
    "${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.h"
    "${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.cpp"
    "${PROJECT_SOURCE_DIR}/include/calculator/core/Calculator.h"
    "${PROJECT_SOURCE_DIR}/src/calculator/core/Calculator.cpp"
)
add_library("${PROJECT_NAME}-shared" SHARED
    "${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.h"
    "${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.cpp"
    "${PROJECT_SOURCE_DIR}/include/calculator/core/Calculator.h"
    "${PROJECT_SOURCE_DIR}/src/calculator/core/Calculator.cpp"
)

显然，这里存在一个问题：源定义是重复的。它很难维护并且也容易出错。

为了避免这种情况，我想创建一个 CMake 列表变量，以便源定义可以在两个目标中重用。

我已经尝试过这个但它不起作用：

set(CALCULATOR_CORE_SOURCES_LIST
    "${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.h"
    "${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.cpp"
    "${PROJECT_SOURCE_DIR}/include/calculator/core/Calculator.h"
    "${PROJECT_SOURCE_DIR}/src/calculator/core/Calculator.cpp"
)
string(REPLACE ";" " " CALCULATOR_CORE_SOURCES "${CALCULATOR_CORE_SOURCES_LIST}")

add_library("${PROJECT_NAME}" STATIC ${CALCULATOR_CORE_SOURCES})
add_library("${PROJECT_NAME}-shared" SHARED ${CALCULATOR_CORE_SOURCES})

它失败并出现错误：Cannot find source file.

那么...如何在目标之间重用源文件定义而不进行这种重复？是否可以使用列表来做到这一点，或者是否有更好的方法来解决这个问题？

PS：我使用的是CMake 3.15

Answer 1

你的代码很接近；您可以简单地使用该CALCULATOR_CORE_SOURCES_LIST变量将源/标头组添加到两个add_library()调用中：

set(CALCULATOR_CORE_SOURCES_LIST
    ${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.h
    ${PROJECT_SOURCE_DIR}/src/calculator/core/ShuntingYard.cpp
    ${PROJECT_SOURCE_DIR}/include/calculator/core/Calculator.h
    ${PROJECT_SOURCE_DIR}/src/calculator/core/Calculator.cpp
)

add_library(${PROJECT_NAME} STATIC ${CALCULATOR_CORE_SOURCES_LIST})
add_library(${PROJECT_NAME}-shared SHARED ${CALCULATOR_CORE_SOURCES_LIST})

如果两个库的源组相同，则您只需定义列表一次。从文档来看，该set命令将执行以下操作：

多个参数将作为分号分隔的列表连接起来，形成要设置的实际变量值。

因此，这个列表可以传递给add_library()调用。您也不应该需要在每个文件周围加上引号 ( ")。