patch -d gcc-4.7.3 -p1 < /home/dan/dreamcast/kallistios/utils/dc-chain/patches/gcc-4.7.3-kos.diff
patching file gcc/configure
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file gcc/configure.rej
patching file libgcc/config/sh/crt1.S
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file libgcc/config/sh/crt1.S.rej
The next patch would create the file libgcc/config/sh/fake-kos.S,
which already exists!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored
The next patch would create the file libgcc/config/sh/gthr-kos.h,
which already exists!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored
patching file libgcc/config/sh/t-sh
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file libgcc/config/sh/t-sh.rej
patching file libgcc/configure
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file libgcc/configure.rej
patching file gcc/cp/cfns.h
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
2 out of 2 hunks ignored -- saving rejects to file gcc/cp/cfns.h.rej
Makefile:108: recipe for target '/home/dan/dreamcast/kallistios/utils/dc-chain/patches/gcc-4.7.3-kos.diff' failed