[Bug jit/64810] jit not working on armv7hl ("ld: error: /tmp/libgccjit-ZGemdr/fake.so uses VFP register arguments, /tmp/ccJFCBsE.o does not")

["dmalcolm at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64810

--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Both the compiler and libgccjit were configured with:
> --with-tune=cortex-a8 --with-arch=armv7-a --with-float=hard
> --with-fpu=vfpv3-d16 --with-abi=aapcs-linux
> on the configure command line.  Perhaps some of these options are set for
> driver only (libgccjit presumably doesn't use any driver) and need to be
> passed explicitly to the compiler?

libgccjit *does* use the driver; the library runs toplev.c to generate a .s
file, then invokes the driver to turn it into a .so file.  It looks like
there's some kind of mismatch between these two things.

It looks like I'm going to need to get onto armvhl hw (or qemu) to investigate
further.

Jakub: BTW, the jit testsuite does extra-verbose logging, beyond jit.log; in
particular the arguments for both of the invocations above are logged to:
  gcc/testsuite/jit/*.log.txt
so if it's easy to hack up the specfile to stick these in the uuencoded logs,
that might be beneficial.