sorry about the checking in the patch to fix the compiler warning on m68k-linux wrt __clear_cache without consulting with you guys first. I was confused since FLUSH_DCACHE was using __clear_cache, which is an internal function from libgcc2. I didn't realize the code was linux specific, since it was the only definition of CLEAR_INSN_CACHE for m68k in gcc's current sources.
After looking through the gcc sources, I found that __clear_cache was only exported through libgcc2.h, which apparently doesn't get installed by gcc. So we were delegating to a function that may not necessarily be a part of the interface exported by gcc.
Instead, as we need (according to the old comment) to rely on the help of the OS for this anyway, I'd propose moving the cache-flushing handling on m68k to the os-dependant jit-md.h files, like it's done for m68k-netbsd now. So I'd propose doing the following:
* define FLUSH_DCACHE to '?' in the general case
* move current definition and clear-cache.h to config/m68k/linux, since it only works on linux anyway.
* Change AmigaOS definition of FLUSH_DCACHE to use CacheClearU from exec.library.[1] [2] [3]. since I'm not really familliar with AmigaOS programming (any more), I hope Tony can try that out.
* A-UX, NextStep : Support for A-UX and NextStep has been removed from gcc, so __clear_cache should be defined as CLEAR_INSN_CACHE was in gcc [4], [5]. On the other hand, NextStep doesn't have support for jit anyway, so that probably doesn't matter.
* OpenBSD: no idea. There seems to be no such thing as CLEAR_INSN_CACHE in the sources, and they don't have a m68k_sync_icache function like NetBSD has. We can leave it as __clear_cache there, which is what's there anyway.
* SunOS4: doesn't have a jit port either, so that doesn't matter much, I guess. I couldn't find the corresponding gcc m68k config files for it, unfortunately.
cheers, dalibor topic
[1] http://www.mways.co.uk/amiga/howtocode/text/generalguidelines.php
[2] http://amiga.nvg.org/amiga/reference/AmigaMail_Vol2_guide/node0083.html
[3] http://amiga.nvg.org/amiga/reference/AmigaMail_Vol2_guide/node0086.html
[4] http://savannah.gnu.org/cgi-bin/viewcvs/gcc/gcc/gcc/config/m68k/Attic/a-ux.h?rev=1.10&content-type=text/vnd.viewcvs-markup
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