Re: How to force linking to an archive?

[Christian Rössel]

Jeffrey,

On 11/21/2013 03:26 PM, Jeffrey Walton wrote:
> I'm trying to evaluate a third party library based on autotools. The
> evaluation includes some basic dynamic analysis using Clang 3.3 (the
> analysis is provided by the sanitzers).
>
> `make check` is failing due to missing symbols:
>
> libjpeg.a(jmemmgr.o): In function `do_sarray_io':
> /home/jwalton/Desktop/jpeg-6b/jmemmgr.c:695: undefined reference to
> `__ubsan_handle_type_mismatch'
> /home/jwalton/Desktop/jpeg-6b/jmemmgr.c:695: undefined reference to
> `__ubsan_handle_type_mismatch'
> /home/jwalton/Desktop/jpeg-6b/jmemmgr.c:696: undefined reference to
> `__ubsan_handle_type_mismatch'
> ...
>
> However, I'm including the required clang library through LDLIBS:
>
> export LDLIBS="/usr/local/lib/clang/lib/linux/3.3/libclang_rt.full-x86_64.a
> /usr/local/lib/clang/lib/linux/3.3/libclang_rt.ubsan-x86_64.a"
> export CC=/usr/local/bin/clang
> export CXX=/usr/local/bin/clang++
> export CFLAGS="-g3 -fsanitize=address -fsanitize=undefined"
> export CXXFLAGS="-g3 -fsanitize=address -fsanitize=undefined -fno-sanitize=vptr"
>
> The missing functions are part of the libs specified in LDLIBS:

it should be LIBS instead of LDLIBS, see the section 'Some influential 
environment variables' in the configure --help output. There is also no 
need to export variables as you can set them on the command line:
./configure [OPTION]... [VAR=VALUE]...

Hope that helps,
Christian

> $ nm --defined libclang_rt.ubsan-x86_64.a | grep -i __ubsan_handle_type_mismatch
> 0000000000000000 T __ubsan_handle_type_mismatch
> 0000000000000740 T __ubsan_handle_type_mismatch_abort
> ...
>
> How does one force the incusion of a library when using autotools?
>
> Thanks in advance.
>
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