I'm sorry for hijacking this topic guys. :p I am getting somewhere though. GDC changeset 475, using GCC 4.5.0 with applied TDM-GCC 4.5.0 patches, with built gmp, mpc and mpftr. The Windows build documentation needs an update (I'll fix it myself given the chance).
I've gotten build errors after: make STAGE1_CFLAGS="-g3 -O0" 2>&1 | tee build.log this time its Phobos: ../../../../gcc-4.5.0/libphobos/rt/fpmath.d ../../../../gcc-4.5.0/libphobos/rt/fpmath.d: In function 'signbit': ../../../../gcc-4.5.0/libphobos/rt/fpmath.d:1:0: internal compiler error: in build_ref_for_offset_1, at tree-sra.c:1405 Please submit a full bug report, with preprocessed source if appropriate. See <http://bitbucket.org/goshawk/gdc/issues> for instructions. make[3]: *** [rt/fpmath.o] Error 1 make[3]: Leaving directory `/gdc/dev/build/gcc/i686-pc-mingw32/libphobos' make[2]: *** [all] Error 2 make[2]: Leaving directory `/gdc/dev/build/gcc/i686-pc-mingw32/libphobos' make[1]: *** [all-target-libphobos] Error 2 make[1]: Leaving directory `/gdc/dev/build/gcc' make: *** [all] Error 2 I guess I should file a bug report with the full log.