8000 cannot open source file "alloca.h" when trying to write a C module for MicroPython · Issue #17271 · micropython/micropython · GitHub
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cannot open source file "alloca.h" when trying to write a C module for MicroPython #17271

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marrowbuster opened this issue May 9, 2025 · 1 comment
Open

cannot open source file "alloca.h" when trying to write a C module for MicroPython #17271

marrowbuster opened this issue May 9, 2025 · 1 comment
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@marrowbuster
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Port, board and/or hardware

rp2 port, Waveshare RP2040-PiZero

MicroPython version

MicroPython v1.25.0 on 2025-04-15; Raspberry Pi Pico with RP2040

Reproduction

Was working on a C module file for MicroPython and included this repo as a submodule but when it got time to #includeing the necessary header files, I got the above error. Apparently it's because alloca.h is only present on Linux and I'm using VSCode on Windows with the MicroPico extension. How shall I remedy this?

Expected behaviour

No response

Observed behaviour

Hovering over the #include "py/runtime.h" file leads to the error cannot open source file "alloca.h" being shown.

Additional Information

No, I've provided everything above.

Code of Conduct

Yes, I agree
marrowbuster added a commit to marrowbuster/micropython-epaper that referenced this issue May 9, 2025
@marrowbuster
forget the spidev reimplementation, please reference micropython/micr…
f3214ce 
…opython#17271 to know why. merging this branch into main now.
@agatti
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agatti commented May 10, 2025 •
edited
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To build examples/natmod/re on Picolibc for RV32 I had to add this:

#if defined __has_builtin
#if __has_builtin(__builtin_alloca)
#define alloca __builtin_alloca
#endif
#endif

#if !defined(alloca)
#if defined(_PICOLIBC__) && !defined(HAVE_BUILTIN_ALLOCA)
#define alloca(n) m_malloc(n)
#else
#include <alloca.h>
#endif
#endif

Maybe this can be adapted to your situation (as in, without the defined(_PICOLIBC__) && … bit in there)?

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@agatti @marrowbuster
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