Support picolib #357
Support picolib #357
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bradjc
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Needs a formatting pass? Having a hard time parsing the CI output. It's very exciting to see picolibc support, though it'll be interesting if this build also alleviates the malloc concerns of #305 (comment). |
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The problem with this is that picolibc seems to want core functions without underscores: int fstat(int fd, struct stat *st) { return _fstat(fd, st); }
int isatty(int fd) { return _isatty(fd); }
int read(int fd, void *buf, uint32_t count) { return _read(fd, buf, count); }
int write(int fd, const void *buf, uint32_t count) { return _write(fd, buf, count); }
int lseek(int fd, uint32_t offset, int whence) { return _lseek(fd, offset, whence); }
int close(int fd) { return _close(fd); }
caddr_t sbrk(int incr) { return _sbrk(incr); }whereas newlib wants the versions with the underscore. My attempt to include both causes some apps to fail to compile. In any case, we probably don't want both. I have no idea why picolib deviates here, or if there is a way to request the _ versions. It's worth considering the picolibc flags I am using: I don't know what In any case, I've looked over the picolibc build options a couple times and I can't figure out what would have an impact on _ system names versus not. |
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AFAICT, the presence/absence of the leading underscore is some unimportant fight among various library/tool vendors: https://stackoverflow.com/questions/36438732/close-vs-close-read-vs-read-write-vs-write-what-is-difference — neither is [in]correct. Best (sigh) solution here is probably to |
oh gross
I think we can add this in a reasonable way |
bradjc
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Hurrah this passes CI! |
bradjc
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Rebase and updated. |
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Doesn't work on a fresh checkout currently. Had enough time to debug quickly but not push fix sorry. Need to add |
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Does something like d4cb0c3 work? |
bradjc
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Some functions differ between newlib and picolib. Those are now in tock_sys.c.
Switch to TOCK_LIBC variables rather than assuming newlib
Co-authored-by: Pat Pannuto <pat.pannuto@gmail.com>
The newlib and picolib targets can't match both rules.
bradjc
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Beyond the CI error, I don't think the rules are right either. Without debugging deeply, on a fresh checkout it will try to fetch picolib twice: which ultimately causes the build to hang because of this question. full output[-bash] Fri 14 Jun 12:36 [[make-precompiled-picolib] /tmp/libtock-c/examples/blink] |
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Ah, I looked at d4cb0c3 now. Short answer, no. That's actually what I tried the first time for newlib/libc++, and how I eventually ended up with the extra directory. The easy answer is to just embrace the subdirectory like I originally had. It's what |
This uses the new precompiled newlib system to create a compiled picolib for libtock-c.
Hopefully this sweetens the deal for #353.