对于make project，下面的最小示例将允许我成功地为特定目标修改OSX_DEPLOYMENT_TARGET：

set(CMAKE_OSX_DEPLOYMENT_TARGET
    "11.0"
    CACHE STRING "osx deployment target")

# the osx deployment target of mylib is 11.0
add_subdirectory(mylib)

# but one of the external library the test links to is built with 12.0, so I want the test to be compiled with 12.0
find_package(external)

set_property(
  TARGET external
  APPEND
  PROPERTY INTERFACE_COMPILE_OPTIONS -mmacosx-version-min=12.0
  PROPERTY INTERFACE_LINK_OPTIONS -mmacosx-version-min=12.0)

add_executable(mytest main.cpp)

target_link_libraries(mytest PUBLIC mylibs external)

然而，对于xcode项目，OSX_DEPLOYMENT_TARGET是由-target x86_64-apple-macos12.0和-target arm64-apple-macos12.0控制的。mytest是x86_64和arm64的通用二进制文件，我很难弄清楚如何在cmake中将-target x86_64-apple-macos12.0传递给x86_64切片和将-target arm64-apple-macos12.0传递给arm64切片。

set_property(
  TARGET external
  APPEND
  PROPERTY
    INTERFACE_COMPILE_OPTIONS
    -target
    $<$<STREQUAL:$<TARGET_PROPERTY:OSX_ARCHITECTURES>,x86_64:x86_64-apple-macos12.0>>
    $<$<STREQUAL:$<TARGET_PROPERTY:OSX_ARCHITECTURES>,arm64:arm64-apple-macos12.0>>
  PROPERTY
    INTERFACE_LINK_OPTIONS
    -target
    $<$<STREQUAL:$<TARGET_PROPERTY:OSX_ARCHITECTURES>,x86_64:x86_64-apple-macos12.0>>
    $<$<STREQUAL:$<TARGET_PROPERTY:OSX_ARCHITECTURES>,arm64:arm64-apple-macos12.0>>
)

但不幸的是，这并不起作用。一个更普遍的问题是，当编译不同的archs时，我如何传入不同的编译标志？