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platformio / platform-native

Native: development platform for PlatformIO
https://registry.platformio.org/platforms/platformio/native
Apache License 2.0
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Different compiler #8

Closed dzarda closed 2 years ago

dzarda commented 3 years ago

I'd like to invoke emcc/em++ (Emscripten) instead of GCC during native compilation. I cannot figure out how to do that.

One possible solution should be to have an argument forwarding script named gcc and prepend PATH with it. This would call emcc. What would be a cleaner solution?

ivankravets commented 3 years ago

Please use PRE script and override CC, CXX, .... See

dzarda commented 3 years ago

@ivankravets Thank you but I'm unable to replace the compiler as env.Replace(CC="emcc") doesn't seem to change anything:

pre_use_emcc.py:

Import("env")

print("Replacing")
env.Replace(AR="emar")
env.Replace(CC="emcc")
env.Replace(CXX="em++")

platformio.ini:

[env:emcc]
extra_scripts = pre:../scripts/pre_use_emcc.py # found successfully
platform = native # ststm32 doesn't replace compiler either
...
dzarda commented 3 years ago 
> pio run -vv
Processing emcc (extra_scripts: pre:../scripts/pre_use_emcc.py; platform: native; build_flags: -std=c++17, -Iinclude, -I../include, -I../lib/u8g2_font_render; src_filter: +<virtualpen.cpp>, +<../../src/statemachine.cpp>, +<../../src/graphics.cpp>, +<../../src/u8g2_font_7x13_tf.c>, +<../../src/u8g2_font_5x8_tf.c>, +<../../lib/u8g2_font_render/u8g2_font_render.c>; lib_extra_dirs: ../lib; lib_deps: u8g2_font_render)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Replacing
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 4 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <u8g2_font_render> (C:\Users\Dzarda\Documents\src\pen\lib\u8g2_font_render)
Building in release mode
gcc -o .pio\build\lib\u8g2_font_render\u8g2_font_render.o -c -DPLATFORMIO=50203 -Isrc -IC:\Users\Dzarda\.platformio\platforms\native\builder\include -IC:\Users\Dzarda\Documents\src\pen\include -IC:\Users\Dzarda\Documents\src\pen\lib\u8g2_font_render C:\Users\Dzarda\Documents\src\pen\lib\u8g2_font_render\u8g2_font_render.c
'gcc' is not recognized as an internal or external command,
operable program or batch file.
g++ -o .pio\build\src\graphics.o -c -std=c++17 -DPLATFORMIO=50203 -Isrc -IC:\Users\Dzarda\.platformio\platforms\native\builder\include -IC:\Users\Dzarda\Documents\src\pen\include -IC:\Users\Dzarda\Documents\src\pen\lib\u8g2_font_render C:\Users\Dzarda\Documents\src\pen\src\graphics.cpp
'g++' is not recognized as an internal or external command,
operable program or batch file.
dzarda commented 3 years ago

Added prints:

print(env.get("CC"))
env.Replace(CC="emcc")
print(env.get("CC"))

leads to...

cc
emcc
dzarda commented 3 years ago

If I use POST then this is printed (also tries compiling with gcc instead)

gcc
emcc

gcc -o .pio\build\lib\u8g2_font_render\u8g2_font_render.o -c -DPLATFORMIO=50203 -Isrc -IC:\Users\Dzarda\.platformio\platforms\native\builder\include -IC:\Users\Dzarda\Documents\src\pen\include -IC:\Users\Dzarda\Documents\src\pen\lib\u8g2_font_render C:\Users\Dzarda\Documents\src\pen\lib\u8g2_font_render\u8g2_font_render.c
'gcc' is not recognized as an internal or external command,
dzarda commented 3 years ago

Note that same behaviour is seen with platform = ststm32

ivankravets commented 2 years ago

Please use POST script, not PRE. See https://github.com/platformio/platform-native/blob/develop/builder/main.py#L23