cmake_minimum_required(VERSION 3.15) project(PchMultilanguage C CXX) add_executable(foobar foo.c main.cpp ) target_include_directories(foobar PUBLIC include) target_precompile_headers(foobar PRIVATE "$<$<COMPILE_LANGUAGE:C>:<stddef.h$<ANGLE-R>>" "$<$<COMPILE_LANGUAGE:CXX>:<cstddef$<ANGLE-R>>" )