how to make binary fittable with alpine distribution?

[Davidrjx]

how to build binary from source code, fittable with alpine distribution?

[jelu]

Someone has to patch it to work with musl.

[Davidrjx]

now i have switched to glibc without attempt to patch it

[poopsicles]

note to whomever decides to patch it to work with musl: strerror_r returns int on non-glibc, but the logic used to detect that doesn't work rn, so building on musl would fail with gcc 14:

dnsperf/src/strerror.c

Lines 29 to 36 in 3c452d4

	#if ((_POSIX_C_SOURCE >= 200112L) && !_GNU_SOURCE) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
	if (strerror_r(errnum, str, len)) {
	(void)snprintf(str, len, "Error %d", errnum);
	}
	return str;
	#else
	return strerror_r(errnum, str, len);
	#endif

$ ...configure, make, musl-gcc, etc.
> strerror.c: In function 'perf_strerror_r':
> strerror.c:35:12: error: returning 'int' from a function with return type 'const char *' makes pointer from integer without a cast [8;;https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Warning-Options.html#index-Wint-conversion-Wint-conversion8;;]
>    35 |     return strerror_r(errnum, str, len);
>       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

alpine just removed the check, because fiddling with ifdefs is a pain...but if you wanted to do things "right", i think you'd switch it to use __gnu_linux__ instead (that shows up for musl on NixOS)...

...and add detection of _POSIX_C_SOURCE to configure.ac (something like this maybe?) so it gets emitted...but this says _POSIX_C_SOURCE shouldn't be used with autoconf, and this talks about it but gives a c++ solution...maybe it'd be easier to refactor to strerror_l because strerror_r's deprecated anyways due to these portability problems? (not sure if that's available everywhere tho..)

(maybe just using the POSIX behaviour by default, then not doing it if __gnu_linux__ or _GNU_SOURCE is present is best?)