Date: Tue, 30 Mar 2021 02:54:52 +0300 From: "Dmitry V. Levin" <ldv@...linux.org> To: Chris Packham <judge.packham@...il.com> Cc: linux-api@...r.kernel.org, linux-kernel@...r.kernel.org, musl@...ts.openwall.com, carlos@...hat.com, davem@...emloft.net Subject: Re: Linux include/uapi/linux/libc-compat.h and Musl include/netinet/in.h incompatibility for __UAPI_DEF_IN6_ADDR_ALT Hi, On Tue, Mar 30, 2021 at 12:30:52PM +1300, Chris Packham wrote: > Hi, > > I've come over from https://github.com/strace/strace/issues/177 > there's a bit of context there. > > Crosstool-ng has hit a problem when building a recent enough version > of strace in a configuration that uses musl libc. > > The error is > > [ALL ] In file included from > /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/bundled/linux/include/uapi/linux/in6.h:26, > [ALL ] from > /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/bundled/linux/include/uapi/linux/if_bridge.h:19, > [ALL ] from > /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/src/rtnl_mdb.c:16: > [ERROR] /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/bundled/linux/include/uapi/linux/libc-compat.h:109: > error: "__UAPI_DEF_IN6_ADDR_ALT" redefined [-Werror] > [ALL ] 109 | #define __UAPI_DEF_IN6_ADDR_ALT 1 > [ALL ] | > [ALL ] In file included from > /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/src/rtnl_mdb.c:15: > [ALL ] /home/x-tool/x-tools/arm-unknown-linux-musleabi/arm-unknown-linux-musleabi/sysroot/usr/include/netinet/in.h:401: > note: this is the location of the previous definition > [ALL ] 401 | #define __UAPI_DEF_IN6_ADDR_ALT 0 > [ALL ] | > [ALL ] cc1: all warnings being treated as errors > [ERROR] make: *** [Makefile:6660: libstrace_a-rtnl_mdb.o] Error 1 > [ALL ] make: Leaving directory > '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace/src' > [ERROR] make: *** [Makefile:2404: all] Error 2 > [ALL ] rm ioctlsort0.o ioctls_all0.h ioctlsort0 > [ALL ] make: Leaving directory > '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace/src' > [ERROR] make: *** [Makefile:601: all-recursive] Error 1 > [ALL ] make: Leaving directory > '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace' > [ERROR] make: *** [Makefile:506: all] Error 2 > [ALL ] make: Leaving directory > '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace' > > It appears that the bundled uapi headers definition of > __UAPI_DEF_IN6_ADDR_ALT conflicts with the musl libc definition. It > looks like libc-compat.h tries to co-exists with GNU libc but this > isn't working for musl. This essentially means that such basic things as #include <netinet/in.h> #include <linux/in6.h> are broken in your setup. -- ldv
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