Date: Wed, 27 May 2020 19:31:38 +0300 From: Alexander Scherbatiy <alexander.scherbatiy@...l-sw.com> To: Rich Felker <dalias@...c.org> Cc: musl@...ts.openwall.com Subject: Re: musl libc version On 27.05.2020 18:57, Rich Felker wrote: > 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? It is used mostly for logging purposes. For example the JVM crash dump  prints libc version as "unknown unknown". This is because the confstr is used in os_linux.cpp  It would be nice to know from a crash dump was JDK linked with glibc or musl in Alpine Linux and which version of musl has been used.  https://bugs.openjdk.java.net/secure/attachment/87289/hs_err_pid5502.log  https://hg.openjdk.java.net/portola/portola/file/7ff60204a181/src/hotspot/os/linux/os_linux.cpp#l607 Thanks, Alexander. > 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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