Date: Tue, 30 Mar 2021 12:30:52 +1300 From: Chris Packham <judge.packham@...il.com> To: linux-kernel@...r.kernel.org, musl@...ts.openwall.com, carlos@...hat.com, davem@...emloft.net Subject: Linux include/uapi/linux/libc-compat.h and Musl include/netinet/in.h incompatibility for __UAPI_DEF_IN6_ADDR_ALT 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. I've identified an egregious hack that I think should make things work (CFLAGS+=-D__USE_MISC) but I wanted to know if there was a nicer way to make this work. Regards, Chris
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