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Ayke van Laethem
eca9120e21
AVR is especially sensitive to false positives in the GC for a few
reasons:
* Pointer values are only two bytes, instead of four on most other
microcontrollers.
* Pointers are not aligned, so any two-byte value in an object coud be
a pointer.
* Memory typically starts at a low address, which makes it much more
likely to clash with a regular integer value (which tend to be small
values).
Therefore, use the precise GC (instead of the conservative GC) by
default. This increases binary size by around 350 bytes, but I think
it's a good tradeoff in most cases: it avoids some runtime errors and
generally RAM tends to be a lot more scarce than flash on AVR chips. If
this is too much, `-gc=conservative` or `-gc=leaking` can be used
instead.
25 lines
450 B
JSON
25 lines
450 B
JSON
{
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"llvm-target": "avr",
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"build-tags": ["avr", "baremetal", "linux", "arm"],
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"goos": "linux",
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"goarch": "arm",
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"gc": "precise",
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"linker": "ld.lld",
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"scheduler": "none",
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"rtlib": "compiler-rt",
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"libc": "picolibc",
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"default-stack-size": 256,
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"cflags": [
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"-Werror"
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],
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"ldflags": [
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"-T", "targets/avr.ld",
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"--gc-sections"
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],
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"extra-files": [
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"src/internal/task/task_stack_avr.S",
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"src/runtime/asm_avr.S"
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],
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"gdb": ["avr-gdb"]
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}
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