Dear GPC Users,
I just compiled GPC from sources on both 32-bit and 64-bit Linux machines. On both machines, I'm running Scientific Linux 6.4, a derivative of Red Had Linux 6.4. The local C compiler is 4.4.7 in both cases.
On the 32-bit machine, I can compile from Pascal to make objects, and link them with libgpc.a to make a shared library. But on the 64-bit machine I find that I must pass -fPIC to GPC to force it to compile position-independent code for the subsequent link. Even then, libgpc.a is position-dependent, so I can't link it into a shared library. So I edit the GPC build's Makefile:
CFLAGS = -g -O2 -fPIC
Now I build GPC again and re-install. The new libgpc.a is position-independent, and I can make my shared library.
Does anyone know why the default on 64-bit is position-dependent, while on 32-bit it is position-independent?
Is there an easier way to add a compiler option to the build process, other than editing the Makefile produced by the GCC_3.4.6 configure script? (For example, can I pass a compiler option into the configure script or into the makefile.)
Anyway: I have adapted my compiler GPC instructions below, and I'll be adding more Linux binary install files in the coming weeks.
http://alignment.hep.brandeis.edu/Software/Pascal/Index.html
Yours, Kevan