gcn/mkoffload.cc: Fix SRAM_ECC and XNACK handling [PR111966]

Some more '-g' fixes as the .mkoffload.dbg.o debug file's has elf flags
which did not match those generated for the compilation, leading to linker
errors.  For .mkoffload.dbg.o, the elf flags are generated by mkoffload
itself - while for the other .o files, that's done by the compiler via
setting default and mainly via the ASM_SPEC.

This is a follow up to r14-8332-g13127dac106724 which fixed an issue
caused by the default arch.  In this patch, it is mainly for gfx1100
and gfx1030 which always failed.  It also affects gfx906 and possibly
gfx900 but only when using the -mxnack/-msram-ecc flags explicitly.

What happens on the compiler side is mainly determined by gcn-hsa.h's
and otherwise by some default setting. In particular for xnack and
sram_ecc, there is:

For gfx1100 and gfx1030, neither xnack nor sram_ecc is set (only
'+wavefrontsize64').

For fiji, gfx900, gfx906 and gfx908 there is always -mattr=-xnack and
for all but gfx908 also -msram-ecc=no - independent of what has been
passed to the compiler. However, on the elf flags, the result differs:
For fiji, due to the HSACOv3, it is always set to 0 via
copy_early_debug_info; for gfx900, gfx906 and gfx908, xnack is OFF.
For sram-ecc, it is 'unset' for gfx900, 'any' for gfx906 and for
gfx908 it is 'any' unless overridden.

For gfx90a, the -msram-ecc= and -mxnack= are passed on, or if not present,
...=any is passed on.  Note that this "any" is different from argument
nor present at elf flag level:
For XNACK: unset/unsupported is 0, any = 0x100, off = 0x200, on = 0x300.
For SRAMECC: unset/unsupported is 0, any = 0x400, off = 0x800, on = 0xc00.

The obstack_ptr_grow changes are more to avoid confusion than having an
actual effect as they would overwise be filtered out via the ASM_SPEC.

gcc/ChangeLog:

	PR other/111966
	* config/gcn/mkoffload.cc (SET_XNACK_UNSET, TEST_SRAM_ECC_UNSET): New.
	(SET_SRAM_ECC_UNSUPPORTED): Renamed to ...
	(SET_SRAM_ECC_UNSET): ... this.
	(copy_early_debug_info): Remove gfx900 special case, now handled as
	part of the generic handling.
	(main): Update SRAM_ECC and XNACK for the -march as done in gcn-hsa.h.

Signed-off-by: Tobias Burnus <tburnus@baylibre.com>

0 files changed, 0 insertions, 0 deletions