Date: Wed, 27 May 2020 11:57:35 -0400 From: Rich Felker <dalias@...c.org> To: Alexander Scherbatiy <alexander.scherbatiy@...l-sw.com> Cc: musl@...ts.openwall.com Subject: Re: musl libc version On Wed, May 27, 2020 at 06:44:38PM +0300, Alexander Scherbatiy wrote: > Hello, > > Using glibc it is possible to get GNU C library version using > confstr() function and _CS_GNU_LIBC_VERSION constant. > > In musl the confstr() returns EINVAL for _CS_GNU_LIBC_VERSION. > Is there a way to get libc version in musl? Can you describe what you're trying to achieve with a version number? musl specifically doesn't publish version numbers via macros or runtime interfaces because they're a poor proxy for checking for the particular feature/property/whatever you care about. For instance, distros may backport the thing you want to an older version, and even if not, you end up hard-coding knowledge about particular libcs that quickly bitrots rather than making something robust and future-proof. With that said, ability to test for some things is presently inadequate, and there's a proposal I've made (based on previous discussions with others) on libc-coord to improve this in a cross-libc manner: https://www.openwall.com/lists/libc-coord/2020/04/22/1 If you have input into what kinds of things you need to be able to test for it would be very helpful. Rich
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