[dm-crypt] Re: cryptsetup 2.4.0 does not compile on musl libc anymore

[Milan Broz <gmazyland@gmail.com>]

On 8/18/21 7:56 PM, Sören Tempel wrote:
> Hello,
> 
> I just wanted to let you know that cryptsetup 2.4.0, contrary to 2.3.0,
> no longer compiles with musl libc, e.g. as used on Alpine Linux, by
> default. This is due to the fact that the external tokens code uses
> dlvsym(3) which is a GNU extension not supported by musl. However, even
> if support for external tokens is disabled (--disable-external-tokens)
> `tests/all-symbols-test.c` fails to compile as it also requires dlvsym
> and is not compiled conditionally.

Hi,

Please create an issue in upstream project
https://gitlab.com/cryptsetup/cryptsetup/-/issues/new

The dlvsym() is crucial to the LUKS2 external token extension, so perhaps
the only solution would be to compile without external tokens for these
constrained libc systems.

And please, report this sooner - we released release-candidates exactly
to find such problems.
But people still do the same - waiting for final release, then complain
that something is broken. We cannot fix things that we do not know about.

If we can somehow automate build with non-glibc systems, I can add this
to CI later.

Thanks,
Milan
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