With Gentoo LLVM-3.5 and Mesa-10.3 I cannot link libOpenCL.so.1.0.0 in Mesa-10.3.0-abi_x86_32.x86/src/gallium/targets/opencl with ld message
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/../../../../x86_64-pc-linux-gnu/bin/ld: .eh_frame_hdr table[5707] FDE at 0000000000c45b8c overlaps table[5708] FDE at 0000000000c45a88.

gcc -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.9.2-alpha20140918/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.9.2_alpha20140918/work/gcc-4.9-20140918/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.9.2-alpha20140918 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.2-alpha20140918 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.2-alpha20140918/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.2-alpha20140918/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/include/g++-v4 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.9.2-alpha20140918/python --enable-languages=c,c++,go,objc,obj-c++,fortran,ada --enable-obsolete --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.9.2_alpha20140918' --enable-libstdcxx-time --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --disable-altivec --disable-fixed-point --enable-targets=all --enable-libgomp --enable-lto --with-cloog --disable-isl-version-check
Thread model: posix
gcc version 4.9.2-alpha20140918 20140919 (prerelease) [gcc-4_9-branch revision 215375] (Gentoo 4.9.2_alpha20140918)

Binutils are today's GIT clone.
I saw bug report at https://bugs.launchpad.net/arb/+bug/1371636 stating this not happens with LLVM 3.4.

Link command:
gmake[3]: Entering directory '/var/tmp/portage/media-libs/mesa-10.3.0/work/Mesa-10.3.0-abi_x86_32.x86/src/gallium/targets/opencl'
/bin/sh ../../../../libtool  --tag=CXX   --mode=link x86_64-pc-linux-gnu-g++ -m32  -flto=4 -fuse-linker-plugin -O2 -pipe -march=core2 -mtune=core2 -mno-3dnow -mno-sse4.2 -mno-avx -mno-xop -mno-fma4 -mno-sse4a -Wall -fno-strict-aliasing -fno-builtin-memcmp  -L/usr/lib32  -no-undefined -version-number 1:0 -Wl,--gc-sections -Wl,--no-undefined -Wl,--version-script=../../../../src/gallium/targets/opencl/opencl.sym -Wl,-flto -fuse-linker-plugin -Wl,--as-needed -Wl,-O2 -Wl,--sort-common -Wl,--hash-style=gnu -O2 -pipe -march=core2 -mtune=core2 -mno-3dnow -mno-sse4.2 -mno-avx -mno-xop -mno-fma4 -mno-sse4a -o libOpenCL.la -rpath /usr/lib32  ../../../../src/gallium/auxiliary/pipe-loader/libpipe_loader_client.la ../../../../src/gallium/state_trackers/clover/libclover.la ../../../../src/gallium/auxiliary/libgallium.la ../../../../src/util/libmesautil.la ../../../../src/gallium/winsys/sw/null/libws_null.la ../../../../src/gallium/winsys/sw/dri/libswdri.la ../../../../src/gallium/winsys/sw/xlib/libws_xlib.la -lX11 -lXext -lXfixes -ldrm  -lxcb-dri2 -lxcb  -ldrm   -ldl -lclangCodeGen -lclangFrontendTool -lclangFrontend -lclangDriver -lclangSerialization -lclangCodeGen -lclangParse -lclangSema -lclangAnalysis -lclangAST -lclangEdit -lclangLex -lclangBasic -lLLVM-3.5.0
libtool: link: x86_64-pc-linux-gnu-g++ -m32  -fPIC -DPIC -shared -nostdlib /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/../../../../lib32/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/32/crtbeginS.o  -Wl,--whole-archive ../../../../src/gallium/auxiliary/pipe-loader/.libs/libpipe_loader_client.a ../../../../src/gallium/state_trackers/clover/.libs/libclover.a ../../../../src/gallium/auxiliary/.libs/libgallium.a ../../../../src/util/.libs/libmesautil.a ../../../../src/gallium/winsys/sw/null/.libs/libws_null.a ../../../../src/gallium/winsys/sw/dri/.libs/libswdri.a ../../../../src/gallium/winsys/sw/xlib/.libs/libws_xlib.a -Wl,--no-whole-archive  -L/usr/lib32 -Wl,--as-needed -lexpat -lX11 -lXext -lXfixes -lxcb-dri2 -lxcb -ldrm -ldl -lclangFrontendTool -lclangFrontend -lclangDriver -lclangSerialization -lclangCodeGen -lclangParse -lclangSema -lclangAnalysis -lclangAST -lclangEdit -lclangLex -lclangBasic -lLLVM-3.5.0 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/../../../../lib32 -L/lib/../lib32 -L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/../../../../x86_64-pc-linux-gnu/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/32/crtendS.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2-alpha20140918/../../../../lib32/crtn.o  -m32 -flto=4 -fuse-linker-plugin -O2 -march=core2 -mtune=core2 -mno-3dnow -mno-sse4.2 -mno-avx -mno-xop -mno-fma4 -mno-sse4a -Wl,--gc-sections -Wl,--no-undefined -Wl,--version-script=../../../../src/gallium/targets/opencl/opencl.sym -Wl,-flto -fuse-linker-plugin -Wl,-O2 -Wl,--sort-common -Wl,--hash-style=gnu -O2 -march=core2 -mtune=core2 -mno-3dnow -mno-sse4.2 -mno-avx -mno-xop -mno-fma4 -mno-sse4a   -Wl,-soname -Wl,libOpenCL.so.1 -o .libs/libOpenCL.so.1.0.0

What more information do you need please?