I have Boost installed on my system as a shared library, so I don't
understand why libtool/gcc won't link to it.
Hmm okay, I think I've just discovered why - it seems my local installation of
Boost was compiled without the -fPIC flag, as I have problems even with
trivial compiles, without using automake/libtool:
$ g++ -fPIC -c -o main.o main.cpp -I/usr/include/boost-1_37/ && g++ -fPIC -o
test.so main.o -shared -lboost_system-mt-1_37 -lboost_filesystem-mt-1_37
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib64/libboost_system-mt-1_37.a(error_code.o):
relocation R_X86_64_32S against `a local symbol' can not be used when making a
shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib64/libboost_system-mt-1_37.a:
could not read symbols: Bad value
collect2: ld returned 1 exit status
I think it must have been the way Boost was compiled, because I get the same
error even when I don't link to any libraries:
$ g++ -c -o main.o main.cpp -I/usr/include/boost-1_37/ && g++ -o test.so
main.o -shared
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld:
main.o: relocation R_X86_64_32 against `a local symbol' can not be used when
making a shared object; recompile with -fPIC
main.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
But if I add -fPIC in that case, it works:
$ g++ -fPIC -c -o main.o main.cpp -I/usr/include/boost-1_37/ && g++ -o test.so
main.o -shared
Given that I've used -fPIC in the first command above, it would seem that my
local installation of Boost was compiled without -fPIC, so it looks like all I
need to do is figure out how to do that and everything should work...
Thanks for all your help!
Cheers,
Adam.
