I have successfully build a multiarch gcc in a ppc64. To do so I made some changes to Andreas patch:
1) move powerpc64*-*-* before powerpc*-*-* in src/config-ml.in to make sure the correct option is executed. 2) use /lib32/ld.so.1 as the 32 bits linker 3) fix the "bispecs" target in t-linux64 (see previous email) to build: install the libc6 and libc6-dev powerpc packages in /lib32 and /usr/lib32. copy the files crt1.o, crti.o and crtn.o in /usr/lib32 to /usr/lib32/nof/ export WITHOUT_LANG=java dpkg-buildpackage Rafael
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