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Re: How to force linking to an archive?

From: Jeffrey Walton
Subject: Re: How to force linking to an archive?
Date: Thu, 21 Nov 2013 18:05:46 -0500

I think configuration and libtool are the problem here (I'm seeing the
problem on mulitple projects, with both Mac OS X and Linux).

For example, here's libpng:

/bin/sh ./libtool  --tag=CC   --mode=link /usr/local/bin/clang  -g3
-fsanitize=address -fsanitize=undefined -no-undefined -export-dynamic
-version-number 16:7:0   -export-symbols libpng.sym  -o
-rpath /usr/local/lib png.lo pngerror.lo pngget.lo pngmem.lo
pngpread.lo pngread.lo pngrio.lo pngrtran.lo pngrutil.lo pngset.lo
pngtrans.lo pngwio.lo pngwrite.lo pngwtran.lo pngwutil.lo    -lz
libtool: link: sed 's,^,_,' < libpng.sym > .libs/libpng16-symbols.expsym
libtool: link: /usr/local/bin/clang -dynamiclib  -o
.libs/libpng16.16.dylib  .libs/png.o .libs/pngerror.o .libs/pngget.o
.libs/pngmem.o .libs/pngpread.o .libs/pngread.o .libs/pngrio.o
.libs/pngrtran.o .libs/pngrutil.o .libs/pngset.o .libs/pngtrans.o
.libs/pngwio.o .libs/pngwrite.o .libs/pngwtran.o .libs/pngwutil.o
-lz    -install_name  /usr/local/lib/libpng16.16.dylib
-compatibility_version 24 -current_version 24.0 -Wl,-single_module
Undefined symbols for architecture x86_64:
  "___asan_handle_no_return", referenced from:
      _png_set_sig_bytes in png.o
      _png_data_freer in png.o
      _png_colorspace_set_chromaticities in png.o
      _png_colorspace_set_endpoints in png.o
      _png_icc_profile_error in png.o
      _png_compare_ICC_profile_with_sRGB in png.o
      _png_colorspace_set_rgb_coefficients in png.o

This is despite the fact that LDLIBS was exported with the proper
static libraries. I've tried using both static and dynamic libraries.
I even opened the resulting Makefile and added a LDLIBS=<...> line (it
was missing).

So this may be a bit off-topic since it looks like a collaboration
between autotools and libtools, but how do I configure libtool to use
a library for an autotools project?

Thanks in advance.

On Thu, Nov 21, 2013 at 9:26 AM, Jeffrey Walton <address@hidden> 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:
> $ 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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