CMAKE_TRY_COMPILE_TARGET_TYPE

Type of target generated for try_compile() calls using the source file signature. Valid values are:

EXECUTABLE
Use add_executable() to name the source file in the generated project. This is the default if no value is given.
STATIC_LIBRARY
Use add_library() with the STATIC option to name the source file in the generated project. This avoids running the linker and is intended for use with cross-compiling toolchains that cannot link without custom flags or linker scripts.

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https://cmake.org/cmake/help/v3.6/variable/CMAKE_TRY_COMPILE_TARGET_TYPE.html