Tests/RunCMake/PrecompileHeaders/PchDebugGenex.cmake - third_party/github.com/Kitware/CMake - Git at Google

 enable_language(C)

 add_library(foo foo.c)
 target_include_directories(foo PUBLIC include)
 target_precompile_headers(foo PUBLIC
   "$<$<CONFIG:Debug>:${CMAKE_CURRENT_SOURCE_DIR}/include/foo.h>"
   <stdio.h>
 )
	enable_language(C)

	add_library(foo foo.c)
	target_include_directories(foo PUBLIC include)
	target_precompile_headers(foo PUBLIC
	"$<$<CONFIG:Debug>:${CMAKE_CURRENT_SOURCE_DIR}/include/foo.h>"
	<stdio.h>
	)