[Bug]: colibri does not build agains musl libc

[chouettevan]

Commit or version

fd93c41

Environment

tested on Alpine Linux 3.23.2 in a container with 30 threads on a dual Xeon E5-2680 v2 server. 200 GB RAM

Reproduction steps

cd  colibri/c
./setup.sh

Expected behavior

The program compiles successfully

Actual behavior and logs

🐦 colibrì — setup
  gcc: 15.2.0 · 30 core
  OpenMP: ok
  building (ARCH=native)…
colibri.c: In function 'rss_guard':
colibri.c:8374:5: error: implicit declaration of function 'malloc_trim' [-Wimplicit-function-declaration]
 8374 |     malloc_trim(1024);
      |     ^~~~~~~~~~~
make: *** [Makefile:727: colibri] Error 1

[JustVugg]

Fixed on dev by #1435 (merged). malloc_trim is a glibc extension and the guard was on __linux__; it is now on __GLIBC__, together with the <malloc.h> include.

Two things I checked beyond the patch itself. It is the whole of the musl problem rather than the first of ten: malloc_trim is the only glibc-only symbol in the engine sources, out of the usual suspects (mallinfo, malloc_usable_size, backtrace, qsort_r, strerror_r, fopencookie, gnu_get_libc_version). And on glibc nothing changed: the built binary still carries malloc_trim@GLIBC_2.2.5, so the RAM guard did not quietly lose its trim on the platform that has it.

What CI could not do is compile against musl at all, which is why this reached you instead of a red check. #1436 adds an Alpine leg for exactly that.

If ./setup.sh still fails for you on 3.23 after pulling dev, reopen with the new error and I will take it from there. Thank you for the report: the exact compiler message and the environment made it a ten-minute fix.