[PATCH] Diagnose pr54694

[Richard Henderson <rth at redhat dot com>]

IMO the test case is invalid, but as always an ICE is unacceptable.

I can imagine there are some legitimate uses for absconding with
the hard frame pointer, under -fomit-frame-pointer plus knowledge
that the code is simple enough.

Previously when we got into this situation, we'd silently smash the
hard frame pointer.  The user would find out the problem only through
testing.  But the dwarf2cfi pass has consistency checks that trigger.

This patch preserves the "simple enough" case while generating an
error early enough that the dwarf2cfi pass doesn't run.

Tested on i386 and ppc64.


r~

Attachment: d-54694
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