[CMake] Building on Windows, with NMake, without Unicode Support

[Stewart, Robert]

I can't figure out how to get CMake to build my code with setting -D_UNICODE and -DUNICODE.  I don't want those manifest constants set, but they appear in the generated DependInfo.cmake files when generating code for NMake Makefiles:

SET(CMAKE_CXX_COMPILER_ID "MSVC")

# Preprocessor definitions for this target.
SET(CMAKE_TARGET_DEFINITIONS
  "NT"
  "_UNICODE"
  "UNICODE"
  "_CRT_SECURE_NO_WARNINGS"
  "_SCL_SECURE_NO_WARNINGS"
  "NOMINMAX"
  "NT"
  "WIN32_LEAN_AND_MEAN"
  )

The definitions following those for Unicode are from this command in my CMakeLists.txt:

add_definitions(
   /D_CRT_SECURE_NO_WARNINGS
   /D_SCL_SECURE_NO_WARNINGS
   /DNOMINMAX
   /DNT
   /DWIN32_LEAN_AND_MEAN)

I've tried every which way I can think of to remove those definitions, but nothing has worked:

 - get_target_property() finds nothing for COMPILE_DEFINITIONS or DEFINITIONS.

 - add_definitions(/U_UNICODE /UUNICODE) doesn't work because those precede the -D_UNICODE -DUNICODE arguments generated by the above. (CMake "helpfully" sorts the flags, it seems.  That's a bug, if you ask me.  Order dependent flags, at least, should appear in the order the user gives them.)

 - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /U_UNICODE /UUNICODE") doesn't work.  (I could probably force an update to the cache, but then that would apply globally and not to the current project.

How can I convince CMake to remove those definitions from my builds?


_____
Rob Stewart
Software Engineer
Dev Tools & Components
Susquehanna International Group, LLP



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