Please open a issue at https://gitlab.isc.org/
> On 19 Jul 2021, at 07:19, Ed W wrote:
>
> Hi, I'm building a gentoo based system on arm v7 32bit, using musl as my
> libc. I am hitting a compile error, that I have determined happens on 9.16.9
> onwards, yet I can build fine with 9.16.8 and earlier
>
>
>
> The specific error snippet I see is:
>
> armv7a-unknown-linux-musleabihf-gcc -O2 -pipe -march=armv7-a -mfpu=neon-vfpv4
> -mfloat-abi=hard -mno-unaligned-access -DDIG_SIGCHASE -pthread -fPIC -Wl,-O1
> -Wl,--as-needed -L/usr/lib -Wl,--export-dynamic -o sample-async \
> sample-async.o ../dns/libdns.a ../isccfg/libisccfg.a ../isc/libisc.a
> -lcrypto -luv -ldl
> /usr/lib/gcc/armv7a-unknown-linux-musleabihf/10.3.0/../../../../armv7a-unknown-linux-musleabihf/bin/ld:
> ../isc/libisc.a(backtrace.o): in function `btcallback':
> backtrace.c:(.text+0x50): undefined reference to `_Unwind_GetIP'
> armv7a-unknown-linux-musleabihf-gcc -O2 -pipe -march=armv7-a -mfpu=neon-vfpv4
> -mfloat-abi=hard -mno-unaligned-access -DDIG_SIGCHASE -pthread -fPIC -Wl,-O1
> -Wl,--as-needed -L/usr/lib -Wl,--export-dynamic -o resolve \
> resolve.o ../irs/libirs.a ../dns/libdns.a ../isccfg/libisccfg.a
> ../isc/libisc.a -lcrypto -luv -ldl
> collect2: error: ld returned 1 exit status
> make[1]: *** [Makefile:494: sample-gai] Error 1
> make[1]: *** Waiting for unfinished jobs
> /usr/lib/gcc/armv7a-unknown-linux-musleabihf/10.3.0/../../../../armv7a-unknown-linux-musleabihf/bin/ld:
> ../isc/libisc.a(backtrace.o): in function `btcallback':
> backtrace.c:(.text+0x50): undefined reference to `_Unwind_GetIP'
> collect2: error: ld returned 1 exit status
> make[1]: *** [Makefile:502: sample-request] Error 1
> /usr/lib/gcc/armv7a-unknown-linux-musleabihf/10.3.0/../../../../armv7a-unknown-linux-musleabihf/bin/ld:
> ../isc/libisc.a(backtrace.o): in function `btcallback':
> backtrace.c:(.text+0x50): undefined reference to `_Unwind_GetIP'
> collect2: error: ld returned 1 exit status
> make[1]: *** [Makefile:490: sample-async] Error 1
> /usr/lib/gcc/armv7a-unknown-linux-musleabihf/10.3.0/../../../../armv7a-unknown-linux-musleabihf/bin/ld:
> ../isc/libisc.a(backtrace.o): in function `btcallback':
> backtrace.c:(.text+0x50): undefined reference to `_Unwind_GetIP'
> collect2: error: ld returned 1 exit status
> make[1]: *** [Makefile:486: resolve] Error 1
>
>
>
> I think this is related to this change here:
>
> ---
> /var/tmp/portage/net-dns/bind-tools-9.16.9/work/bind-9.16.9/lib/isc/backtrace.c
> 2020-11-16 14:44:37.0 +
> +++
> /var/tmp/portage/net-dns/bind-tools-9.16.8/work/bind-9.16.8/lib/isc/backtrace.c
> 2020-10-13 08:41:40.0 +
> @@ -40,7 +40,7 @@
> */
> #ifdef HAVE_LIBCTRACE
> #define BACKTRACE_LIBC
> -#elif defined(HAVE_UNWIND_BACKTRACE)
> +#elif defined(__GNUC__) && (defined(__x86_64__) || defined(__ia64__))
> #define BACKTRACE_GCC
> #elif defined(WIN32)
> #define BACKTRACE_WIN32
>
>
>
> If I revert this change then my compile succeeds (although it may not be
> correct?)
>
>
>
> I'm not really skilled enough to understand the details of gcc backtrace
> implementation on arm. I'm using gcc 10.3.0 to compile this, and I can see
> that I have a header:
>
> /usr/lib/gcc/armv7a-unknown-linux-musleabihf/10.3.0/include/unwind.h
>
> So I'm assuming that I have gcc compiled with some kind of unwind
> implementation?
>
> I use a very similar profile to compile near identical code base for both
> amd64 and x86 architectures and both of those have no issues compiling latest
> bind-tools (and previous). Also, near as I can see I have my gcc configured
> identically across all three systems...
>
>
>
> Now I *can* compile bind-tools ok if I install the libunwind library,
> however, that then breaks (re)compiling my gcc compiler, so I'm really
> thinking that's the wrong route to go down?
>
> Temporarily I'm reverting the above change locally, but I wonder if you could
> either guide me to a correct solution, or if someone more knowledgeable can
> revert or write some correct #if test for this situation please?
>
>
>
> I'm sure I have failed to provide enough details at this stage. Please be
> gentle...
>
> Thanks
>
> Ed W
>
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