Setting CXX flags from extra_script.py doesn't work

I followed the split C/C++ build flags instructions in order to use the -fpermissive flag when compiling .cpp files (-fpermissive is not valid for C).

I created a extra_script.py file containing env.Append(CXXFLAGS=["-fpermissive"]) and added extra_scripts = extra_script.py to platformio.ini. However, the flag is not used when building .cpp files (I have a src folder with only main.cpp).

I did not test whether this issue is specifically related the espressif32 platform but most likely this is due to the ESP-IDF CMake build system of this platform.

[valeros]

Hi @KKoovalsky ! Looks like you’re having a problem with native platform. Please open an issue in this repository https://github.com/platformio/platform-native/issues Thanks!

[KKoovalsky]

It actually doesn’t work. With:

env.Append(
    CXXFLAGS=[
        '-Wall',
        '-Wextra',
        '-std=gnu++17',
        '-Wno-register'
    ]
)

1. Tried:

[env]
extra_scripts = pre:extra_script.py

1. Tried:

[env:native]
extra_scripts = pre:extra_script.py

Both doesn’t work, but when I change CXXFLAGS to CPPFLAGS the flags are used BUT, both for g++ and gcc.

See the attached logs:

cppflags_defined.log cxxflags_defined.log