CMAKE_<LANG>_LINKER_LAUNCHER

Added in version 3.21.

Default value for <LANG>_LINKER_LAUNCHER target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is one of:

C
CXX
CUDA

Added in version 4.1.
OBJC
OBJCXX
Fortran

Added in version 4.1.
HIP

Added in version 4.1.

This variable is initialized to the CMAKE_<LANG>_LINKER_LAUNCHER environment variable if it is set.

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https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_LINKER_LAUNCHER.html