ERROR: already selected `xxxx' processor

Wed Jul 5 16:00:00 GMT 2006

Hi all,

one month ago we built a m68k-elf - toolchain ourselfes (binutils 2.16.1 / gcc 4.1.1).

Whilst the gcc doesn't support our used cpu MCF5213 100%, we use the compilerswitch -m5200 to generate generic code for a MCF52xx.
We also need to use inline assembly for the MCF5213 stuff (movec ..., %rambar). So we have to apply a second compiler switch to be passed to gas -Wa,-m5213 (-Wa,-mcpu=5213 for binutils 2.17).

This is ok for binutils 2.16.1 but not for 2.17.

As the compiler passes two "cpu" selections to gas, one indirectly generated by gcc's -m5200 and one direktly passed by -Wa,-mcpu=5213, gas is "confused".
File gas/config/tc-m68k.c checks this and produces an error, because of two different selected cpu's.

My suggestion is:
If gas is invoked with -mcpu=xxx, this should override the former settings. Additional a warning will be produced.

My included patch would produce this behavior.
Please could you check if I done everything right and if it is worth to be applied to gas.

Thomas Fleischmann
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