C++ 具有重复编译标志的CMake生成器表达式

我正在尝试使用创建依赖于编译器的配置。此配置的一部分是使用include目录列表设置编译器标志，类似于。然而，由于某种原因，在这种情况下，表达式对我来说并不合适。以下是简化的示例：

cmake_minimum_required(VERSION 3.6)
project(NinjaPlayground)

add_executable(NinjaPlayground main.cpp)
list(APPEND LIB_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/libraryOne/include")
list(APPEND LIB_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/librartTwo/include")

target_compile_options(NinjaPlayground PRIVATE
                        $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-isystem $<JOIN:${LIB_INCLUDE_DIRS}, -isystem >>
                        $<$<CXX_COMPILER_ID:MSVC>:-experimental:external -external:w -external:I $<JOIN:${LIB_INCLUDE_DIRS}, -external:I >>)

cmake_最低要求（3.6版）
项目（场地）
添加可执行文件（NinjaPlayground main.cpp）
列表（附加LIB_INCLUDE_DIRS“${CMAKE_CURRENT_SOURCE_DIR}/libraryOne/INCLUDE”）
列表（追加LIB_INCLUDE_DIRS“${CMAKE_CURRENT_SOURCE_DIR}/libarttwo/INCLUDE”）
目标编译选项（Ninjapplayland专用
$
$)

如果在UNIX系统中构建，此配置生成的命令如下所示：

/usr/bin/c++ -isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include /home/the-dreams-wind/Documents/Ninja/librartTwo/include -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp

/usr/bin/c++ -isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include -isystem /home/the-dreams-wind/Documents/Ninja/librartTwo/include -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp

target_compile_options(NinjaPlayground PRIVATE
                        "$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:SHELL:-isystem$<JOIN:${LIB_INCLUDE_DIRS}, -isystem>>"
                        "$<$<CXX_COMPILER_ID:MSVC>:SHELL:-experimental:external -external:w -external:I$<JOIN:${LIB_INCLUDE_DIRS}, -external:I>>")

/usr/bin/c++-isystem/home/thedreams wind/Documents/Ninja/libraryOne/include/home/thedreams wind/Documents/Ninja/librartTwo/include-MD-MT-CMakeFiles/ninjaprayground.dir/main.cpp.o-MF-CMakeFiles/ninjaprayground.dir/o.d-o/CMakeFiles/ninjaprayground.dir.dir/main.cpp
如您所见，列表已展开，但联接表达式忽略了它。我还试图引用以下论点：

target_compile_options(NinjaPlayground PRIVATE
                        "$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-isystem $<JOIN:${LIB_INCLUDE_DIRS}, -isystem >>"
                        "$<$<CXX_COMPILER_ID:MSVC>:-experimental:external -external:w -external:I $<JOIN:${LIB_INCLUDE_DIRS}, -external:I >>")

target\u compile\u选项（Ninjapplayland专用）
"$"
"$")

它正确连接字符串，但在参数列表中保留引号：

/usr/bin/c++ "-isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include -isystem /home/the-dreams-wind/Documents/Ninja/librartTwo/include" -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp
/usr/bin/c++“-isystem/home/thedreams wind/Documents/Ninja/libraryOne/include-isystem/home/thedreams wind/Documents/Ninja/librartTwo/include”-MD-MT-CMakeFiles/NinjaPlayground.dir/main.cpp.o-MF-CMakeFiles/NinjaPlayground.dir.dir/NinjaPlayground.o.d-o-o-o-o-o-c./main.cpp
MSVC也会出现同样的问题。我只是想说清楚，我期待的结果应该是这样的：

/usr/bin/c++ -isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include /home/the-dreams-wind/Documents/Ninja/librartTwo/include -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp
/usr/bin/c++ -isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include -isystem /home/the-dreams-wind/Documents/Ninja/librartTwo/include -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp
target_compile_options(NinjaPlayground PRIVATE
                        "$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:SHELL:-isystem$<JOIN:${LIB_INCLUDE_DIRS}, -isystem>>"
                        "$<$<CXX_COMPILER_ID:MSVC>:SHELL:-experimental:external -external:w -external:I$<JOIN:${LIB_INCLUDE_DIRS}, -external:I>>")

/usr/bin/c++-isystem/home/the dreams wind/Documents/Ninja/libraryOne/include-isystem/home/the dreams wind/Documents/Ninja/librartTwo/include-MD-MT-CMakeFiles/ninjapplayground.dir/main.cpp.o-MF-CMakeFiles/ninjapplayground.dir/main.cpp.dir/main/main.cpp
我知道我可以在列表上循环并逐个添加选项，但是我想知道我在这里缺少了什么？
在使用它一段时间后，问题最终归结为空间和参数重复数据消除。可以通过删除选项（例如，
-systemi
）及其参数（路径）之间的空格来部分地处理它。但是，有些标志无法避免重复（如
-Xclang
选项）。以抑制重复数据消除。它保留空格，正确解析参数，可以这样使用：

/usr/bin/c++ -isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include /home/the-dreams-wind/Documents/Ninja/librartTwo/include -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp
/usr/bin/c++ -isystem /home/the-dreams-wind/Documents/Ninja/libraryOne/include -isystem /home/the-dreams-wind/Documents/Ninja/librartTwo/include -MD -MT CMakeFiles/NinjaPlayground.dir/main.cpp.o -MF CMakeFiles/NinjaPlayground.dir/main.cpp.o.d -o CMakeFiles/NinjaPlayground.dir/main.cpp.o -c ../main.cpp
target_compile_options(NinjaPlayground PRIVATE
                        "$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:SHELL:-isystem$<JOIN:${LIB_INCLUDE_DIRS}, -isystem>>"
                        "$<$<CXX_COMPILER_ID:MSVC>:SHELL:-experimental:external -external:w -external:I$<JOIN:${LIB_INCLUDE_DIRS}, -external:I>>")

target\u compile\u选项（Ninjapplayland专用）
"$"
"$")
根据我最近使用
$
进行的测试，它不适用于显式列表或变量中的列表。这是因为列表“破坏”了正则表达式本身。
$
的用法是处理属性：
-I$
。对于常规列表，请使用命令流。