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493aae4b03
This dates back to the creation of top-level `libgcc` in
fa9585134f. I strongly suspect that this
does nothing.
Andrew Pinksi adds:
> So looking into this further, MACHMODE_H used part of LIBGCC_DEPS
> because of TM_H and r0-78222-gfa9585134f6f58 moved away from including
> tm.h from libgcc. It was copied over unused.
It is indeed used then.
(For background context, my overall goal here is hoping libgcc can depend on
fewer/no stuff that is generated by `gcc/Makefile`. This is me trying to
pluck some low-hanging fruit -- this is the only direct mention of
`insn-modes.h` in libgcc.)
libgcc/ChangeLog:
* Makefile.in: Delete dead `MACHMODE_H` variable
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