link against libexpat.a of graph lib fails on 64 bit Linux

[michael.hufer@…]

Error from build:
---
bash> EXPAT_INCLUDE=/home/micha/external-builds/xgen-externals/install/Linux-x86_64/expat-2.0.1/include EXPAT_LIBPATH=/home/micha/external-builds/xgen-externals/install/Linux-x86_64/expat-2.0.1/lib make
./tools/jam/src/bin.linuxx86_64/bjam -sICU_PATH=/home/micha/external-builds/xgen-externals/install/Linux-x86_64/icu-3.8.1 --user-config=user-config.jam --without-python --without-mpi --without-test --without-wave
Building Boost.Regex with Unicode/ICU support enabled
Using ICU in /home/micha/external-builds/xgen-externals/install/Linux-x86_64/icu-3.8.1/include
...patience...
...patience...
...found 3188 targets...
...updating 1 target...
gcc.link.dll bin.v2/libs/graph/build/gcc-4.3/release/threading-multi/libboost_graph-gcc43-mt-1_35.so.1.35.0 /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld: /home/micha/external-builds/xgen-externals/install/Linux-x86_64/expat-2.0.1/lib/libexpat.a(xmlparse.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC
/home/micha/external-builds/xgen-externals/install/Linux-x86_64/expat-2.0.1/lib/libexpat.a: could not read symbols: Bad value
collect2: ld returned 1 exit status

"g++" -L"/home/micha/external-builds/xgen-externals/install/Linux-x86_64/expat-2.0.1/lib" -o "bin.v2/libs/graph/build/gcc-4.3/release/threading-multi/libboost_graph-gcc43-mt-1_35.so.1.35.0" -Wl,-h -Wl,libboost_graph-gcc43-mt-1_35.so.1.35.0 -shared -Wl,--start-group "bin.v2/libs/graph/build/gcc-4.3/release/threading-multi/read_graphviz_spirit.o" "bin.v2/libs/graph/build/gcc-4.3/release/threading-multi/graphml.o" -Wl,-Bstatic -lexpat -Wl,-Bdynamic -lrt -Wl,--end-group -Wl,--strip-all -pthread

...failed gcc.link.dll
bin.v2/libs/graph/build/gcc-4.3/release/threading-multi/libboost_graph-gcc43-mt-1_35.so.1.35.0...
...failed updating 1 target...
Not all Boost libraries built properly.
---
Build was with gcc 4.3 on OpenSuSE 11 (x86_64).
The link error occurres with both the (native) expat lib from openSUSE and the expat lib I build myself (the example above tries to link against the latter)

[Douglas Gregor]

We can't build a shared library against a static library that hasn't been compiled with -fPIC. It sounds like expat is being built incorrectly. Is there a shared-library version of expat (ibexpat.so)?

[michael.hufer@…]

Yes there is. But even if I rename the static libexpat.a the build system cannot link and complains that it does not find libexpat.a, instead of linking with the libexpat.so (which is in the same lib folder).

[Douglas Gregor]

I believe I've found the issue, but I can't test it myself at the moment. If you make this change to libs/graph/build/Jamfile.v2, it should link against the shared expat:

Index: Jamfile.v2 =================================================================== --- Jamfile.v2 (revision 47135) +++ Jamfile.v2 (working copy) @@ -26,7 +26,7 @@ if [ modules.peek : EXPAT_INCLUDE ] && [

optional_sources += graphml.cpp ; optional_reqs += <include>$(EXPAT_INCLUDE)

<library-path>$(EXPAT_LIBPATH)

• <find-static-library>expat

+ <find-shared-library>expat

;

} else

[Douglas Gregor]

(In [47719]) Link against shared expat. Fixes #2123

[Dave Abrahams]

Should this patch have used <find-library> instead? Please feel free to close if not.

[Douglas Gregor]

<find-library> doesn't seem to exist:

unknown feature "<find-library>"

[(none)]

Milestone Boost 1.35.1 deleted