disable precompiled header for a single file

Question

I am working on a project with many .cpp files on vs2013, and using a precompiled header for them. I am using CMake to build my project.

But I have one .c file (let's call it xyz.c) for which I want to disable precompiled header.

I tried several methods, but if I enable precompiled headers to all .cpp file, it automatically turns on for the .c file as well. This is what I tried:

set_source_files_properties (xyz.c
  PROPERTIES COMPILE_FLAGS /Y-xyz.c )

Assuming that /Yu is on for all files, I just try to turn off this option for xyz.c.

If any one knows any method, please let me know.

Answer 1

Starting from cmake 3.16 setting /Y- compiler option will not work. Correct way to disable precompiled headers for individual file is like this:

set_source_files_properties(non-pch.cpp PROPERTIES SKIP_PRECOMPILE_HEADERS ON)

Documentation: https://cmake.org/cmake/help/v3.16/prop_sf/SKIP_PRECOMPILE_HEADERS.html

(Not so useful anyway)

Answer 2

/Y- doesn't take arguments. Try:

set_source_files_properties(xyz.c
  PROPERTIES COMPILE_FLAGS /Y-)

Alternatively, instead of using /Yu on all files and disable it only for your .c file, you can use the opposite approach and only use /Yu for the .cpp files. Given your .cpp files are listed in a variable SOURCES and my_pch.h is your precompiled header:

set_source_files_properties(${SOURCES}
  PROPERTIES COMPILE_FLAGS /Yumy_pch.h)