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List:       busybox
Subject:    Re: [PATCH] tar: Fix build error when CONFIG_UNCOMPRESS is not selected
From:       Abdoulaye Walsimou GAYE <awg () embtoolkit ! org>
Date:       2013-01-28 21:50:13
Message-ID: 5106F295.5050708 () embtoolkit ! org
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On 01/28/2013 08:48 AM, Denys Vlasenko wrote:
> Hello,
> See attached .config file and see below the build link error,
> 
> /home/walsimou/embtoolkit.git/build/packages_build-mipsel-linux-mips32/busybox-1.20.2/archival/tar.c:1065: \
>                 undefined reference to `unpack_Z_stream'
> /home/walsimou/embtoolkit.git/build/packages_build-mipsel-linux-mips32/busybox-1.20.2/archival/tar.c:1065: \
>                 undefined reference to `unpack_Z_stream'
> /home/walsimou/embtoolkit.git/tools-mipsel-linux-mips32/bin/mipsisa32el-unknown-linux-uclibc-ld: \
>                 busybox_unstripped: hidden symbol `unpack_Z_stream' isn't defined
> /home/walsimou/embtoolkit.git/tools-mipsel-linux-mips32/bin/mipsisa32el-unknown-linux-uclibc-ld: \
>                 final link failed: Bad value
> mipsisa32el-unknown-linux-uclibc-clang: error: linker command failed with exit code \
> 1 (use -v to see invocation) 
> I was able to build busybox-1.20.2 with this .config
> without errors.
> 
> Looks like your compiler did not optimize this out:
> 
> if (opt & OPT_COMPRESS)
> USE_FOR_MMU(xformer = unpack_Z_stream;)
> USE_FOR_NOMMU(xformer_prog = "uncompress";)
> 
> 
> even though OPT_COMPRESS is a constant zero.

Hello,
You're absolutely right, I was compiling with -O0 and llvm at this optimization level
seems to disable dead code elimination . The same .config even with -O1 links without \
error. Huummm well, sorry for the noise!

Thanks,
AWG
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