RE: MSPM0 project with VS Code, CMake and GCC - part 6: empty "template" project

Jan Cumps — Sat, 12 Sep 2026 17:16:13 GMT

A bit of AI help.

The SDK uses a construct that throws a lot of warnings in GCC 15. Because I'm not changing the SDK source, I tried to suppress it with:

target_compile_options(${CMAKE_PROJECT_NAME} PRIVATE -Wno-volatile)

I got 1 remaining warning: command-line option '-Wno-volatile' is valid for C++/ObjC++ but not for C

Here's Google's AI reply. It solved it.

Question: command-line option '-Wno-volatile' is valid for C++/ObjC++ but not for C

Answer:

This warning or error occurs because the compiler flag -Wno-volatile is being passed to the C compiler (like gcc), but this specific flag only exists for the C++ compiler (like g++).

This usually happens when the flag is added to a global variable (such as CFLAGS or a shared build_flags configuration), forcing it onto all source files regardless of language.

How to Fix It

You need to ensure this flag is only passed to C++ compilations. Here is how to fix it depending on your build tool:

1. In CMake

Instead of using a global compiler definition, restrict the flag using a language-specific generator expression with target_compile_options:

cmake

target_compile_options(your_target_name PRIVATE
    $<$<COMPILE_LANGUAGE:CXX>:-Wno-volatile>
)