| From | Arnd Bergmann <> | Subject | Re: Re : [PATCH, RFC 09/22] crypto: lz4: don't build on ARM | Date | Fri, 3 May 2013 17:29:17 +0200 |
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On Friday 03 May 2013, Chanho Min wrote: > >It is not currently possible to build the LZ4 code on ARM, so let's > >remove that option in Kconfig for now. > > > >lib/built-in.o: In function `lz4_compress64kctx': > > lib/lz4/lz4_compress.c:339: undefined reference to `__ctzsi2' > >lib/built-in.o: In function `lz4_compressctx': > > lib/lz4/lz4_compress.c:157: undefined reference to `__ctzsi2' > >lib/built-in.o: In function `lz4hc_commonlength': > > lib/lz4/lz4hc_compress.c:102: undefined reference to `__ctzsi2' > > lib/lz4/lz4hc_compress.c:102: undefined reference to `__ctzsi2' > >lib/built-in.o: In function `lz4hc_insertandgetwidermatch': > > lib/lz4/lz4hc_compress.c:230: undefined reference to `__ctzsi2' > > Please, let me know the gcc version and tested defconfig. > I didn't have any problem to build with gcc 4.6.4 on armv7. > Some architecture need libgcc functions for __builtin_clz/ctz. > Porting them to lib is in progress: > http://marc.info/?l=linux-kernel&m=136748861811956&w=2 > But, It doesn't happen on ARM, PowerPC and x86.
I tested with gcc-4.8 and random configurations. I've tried it again now and can't reproduce it at the moment. I'll try building more random configurations until I have nailed down the problem.
Sorry about this, I should have been more careful about my original conclusion here.
Arnd
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