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Date: Sun, 6 Nov 2022 18:39:04 -0500
From: Rich Felker <>
To: Dmitry Bogatov <>
Subject: Re: Behaviour of strverscmp(3)

On Sun, Nov 06, 2022 at 06:18:22PM -0500, Dmitry Bogatov wrote:
> Hello.
> While trying to building gsasl statically with musl library as part of
> Nixpkgs distribution, I noticed that test built from tests/version.c
> fails when built with musl library. After a bit of troubleshooting, I
> can pinpoint the reason -- different behaviour of "strverscmp" from
> glibc and musl.
> Example code:
> #include <string.h>
> #include <stdio.h>
> int main()
> {
> 	int value = strverscmp("UNKNOWN", "2.2.0");
> 	printf("%d\n", value);
> 	return 0;
> }
> Under glibc value "35" is printed (positive), under musl value "-1" is
> printed (negative). Not sure what is the correct solution for the
> issue, so I cross-post into two lists.
> For now I plan to patch-out this particular test. Thank you.

It looks like we're neglecting to honor the exception case to "longer
digit sequence is greater" when one of the sequences is degenerate (no


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