[bug]preprocessor_definitions.Release["XXX"] = None generate not corrext

[peterpuppy]

Environment details

• Operating System+version:windows11
• Compiler+version: vc142
• Conan version: 2.1
• Python version:3.8
  tc.preprocessor_definitions[f"PROFILE"] = None

Steps to reproduce

in conanfile.py

tc.preprocessor_definitions[f"PROFILE"] = None

conan install in toolchain file

# Preprocessor definitions per configuration
set(CONAN_DEF_ReleaseRelease "None")
add_compile_definitions(Release=$<IF:$<CONFIG:Release>,${CONAN_DEF_ReleaseRelease},"">)

Logs

No response

[memsharded]

Hi @peterpuppy

Thanks for your report.

We have a test in our suite that tests this in

conan/conans/test/functional/toolchains/cmake/test_cmake_toolchain.py

Line 341 in 2cf7c32

tc.preprocessor_definitions["NOVALUE_DEF"] = None

It seems it is generating the correct toolchain.cmake code:

add_compile_definitions("NOVALUE_DEF")

And the C++ code is correctly using it:

#ifdef NOVALUE_DEF
            printf("NO VALUE!!!!");
#endif

So I'd say this is working fine.

[memsharded]

It seems that the issue could be related to using tc.preprocessor_definitions.release[f"PROFILE"] = None, with using the .<config>. I have doing some improvements in #15756 that would fix this issue, and it will be included in next 2.2 release

[peterpuppy]

yes it's.

tc.preprocessor_definitions.release[f"PROFILE"] = None

my mistake