[Bug 245511] lang/gcc9: build with base GCC on powerpc64 elfv1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245511

--- Comment #12 from Gerald Pfeifer <gerald at FreeBSD.org> ---
(In reply to Piotr Kubaj from comment #9)

Thank you for those tests, Piotr.  The results look concerning indeed,
I wonder what the quality of the produced compiler is. :-(

Just to make sure, what were the last lines coming from gmake, that is
those looking like

   gmake[3]: *** [mode-switching.o] Error 1
   gmake[3]: Leaving directory `/files/pfeifer/OBJ-0131-2308/gcc'
   gmake[2]: *** [all-stage2-gcc] Error 2
   gmake[2]: Leaving directory `/files/pfeifer/OBJ-0131-2308'
   gmake[1]: *** [stage2-bubble] Error 2
   gmake[1]: Leaving directory `/files/pfeifer/OBJ-0131-2308'

where I am mostly interested in those with the "***"?


I am wondering whether this misses where the actual issue happens, since
the docs say the following:

   If you wish to use non-default GCC flags when compiling the stage2
   and stage3 compilers, set @code{BOOT_CFLAGS} on the command line when
   doing @samp{make}.

And they also say:

   Again, if the native compiler miscompiles the stage1 compiler, you may
   need to work around this by avoiding non-working parts of the stage1
   compiler.  Use @code{STAGE1_TFLAGS} to this end.

So I am wondering whether you should not have tried setting STAGE1_TFLAGS
in the first place, to avoid a broken stage1 compiler as opposed to trying
to be gentle to a broken stage1 compiler by only invoking it with -O0.

Do you see what I mean?

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