Re: compiling gpc on Mac OS 10.10.5 Yosemite

libgcc.a is not mentioned in build-gpc.command. I guessed:

# setenv GPC_MAKE_FLAGS 'CC="gcc -arch i386"' # TDS: setenv GPC_MAKE_FLAGS 'CC="gcc -arch i386 -gdwarf-2"'

but it failed as above.

Also just guessing; try instead adding --with-dwarf2 to setenv GPC_CONFIG_EXTRAS "--with-arch=pentium-m --with-tune=prescott" ie setenv GPC_CONFIG_EXTRAS "--with-arch=pentium-m --with-tune=prescott --with-dwarf2"