Want to use the precompiled header of other binary target

[mrk21]

For example, want to use the same precompiled header in order to compile many example codes quickly.

Cotire dose not support this function, so I implemented the command shown below by using cotire private commands:

# HACK: shared precompiled header
function(use_shared_pch target origin)
  # origin prefix header
  get_target_property(origin_prefix_header ${origin} COTIRE_CXX_PREFIX_HEADER)

  # make target pch flags
  cotire_make_pch_file_path(CXX ${CMAKE_CURRENT_SOURCE_DIR} ${origin} origin_pch_file)
  cotire_add_prefix_pch_inclusion_flags(
    CXX ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}
    ${origin_prefix_header} ${origin_pch_file}
    target_pch_flags
  )
  set_property(TARGET ${target} APPEND_STRING PROPERTY COMPILE_FLAGS ${target_pch_flags})
endfunction()

add_executable(example1 example1.cpp)
cotire(example1)

add_executable(example2 example2.cpp)
use_shared_pch(example2 example1)

add_executable(example3 example3.cpp)
use_shared_pch(example3 example1)

[MrSapps]

shared pch fails in msvc