Many thanks to all and for all the links - that's cleared the air a bit! embecosm: based on GCC-4.4.7
I'll add yet another AVR32 toolchain builder for those interested: https://gitlab.com/martinwguy/ct-ng-avr32 based on avr32-gnu-toolchain 4.3.2 (which seems to have disappeared from their releases!) forward-ported from gcc-4.4.3 binutils-1.18 newlib-1.16.0 to gcc-4.4.7 binutils.1.22 newlib-1.20.0 with some other patches to correct GCC pr's (from Debian and elsewhere) to fix incorrect code generation and for smaller code size, to fix dlmalloc in newlib which corrupts memory when using more than one region of RAM, and more hacks for smaller code size when using -Os It's based on crosstool-ng, so contains patches to mainline sources, not a modified gcc. Thanks for the pointer to RedHat, the only more recent version of gcc (4.8.5 over 4.4.7). If that will solve my company's problems I'll look at incorporating it, but I suspect it only produces better code, not language features. Blessings M
