Pgexodus handbuilding instructions

Note that all routines are marked for "C linkage" in order to work with the postgres library "pq". For convenience they are all compiled under C++ since callexodus requires boost which is c++. The .c routines could equally well be compiled with the plain c compiler. The link stage must be done in c++ style in order to link to the c++ runtime library "rt".

cd ~/exodus/trunk/exodus/pgexodus/src

g++ -fpic -c *.c *.cpp -I`pg_config --includedir` -I`pg_config --includedir-server`
g++ -shared -o pgexodus.so *.o -lrt -lpq

Check the build as follows:

ld pgexodus.so

Should give something like the following. These 8 references to the postgres library all seem to be resolved at runtime.

pgexodus.so: undefined reference to `Float8GetDatum'
pgexodus.so: undefined reference to `pg_atoi'
pgexodus.so: undefined reference to `CurrentMemoryContext'
pgexodus.so: undefined reference to `pg_detoast_datum'
pgexodus.so: undefined reference to `pfree'
pgexodus.so: undefined reference to `elog_start'
pgexodus.so: undefined reference to `MemoryContextAlloc'
pgexodus.so: undefined reference to `elog_finish'

Also check the following

ldd -u pgexodus.so

Should give something like:

./pgexodus.so: error: symbol lookup error: undefined symbol: CurrentMemoryContext (continued)
undefined symbol: CurrentMemoryContext  (./pgexodus.so)
Unused direct dependencies:

        /lib/librt.so.1
        /usr/lib/libpq.so.5
        /lib/libm.so.6
        /lib/libgcc_s.so.1