My SPARC, MIPS and ARM platforms are still running, but based on previous testing of nightly v1.7 tarballs I don't expect to find any issues there.
I can report SUCCESS for Linux/gcc on ARM (v5 and v7) and on MIPS (32 and 64 bit).
For Solaris-10 with the Solaris Studio 12.3 compilers on SPARC I have encountered a link failure when configured with "--enable-static --enable-shared" (fine w/o "--enable-static"). I have not yet tried this configuration with gcc. I have started builds of 1.7.3 to determine if this is a regression or not before investing more deeply. I hope to be able to report more tonight.