On Apr 23, 2005, at 5:42 PM, Matt Thomas wrote:
Running the libstdc++ testsuite on NetBSD/sparc or NetBSD/sparc64 results in most tests failing like:
<command line>:1: fatal error: had to relocate PCH compilation terminated. compiler exited with status 1
This is due to a misassumption in ggc-common.c:654 (mmap_gt_pch_use_address):
This version assumes that the kernel honors the START operand of mmap
even without MAP_FIXED if START through START+SIZE are not currently
mapped with something.
That is not true for NetBSD. Due to MMU idiosyncracies, some architecures
(like sparc and sparc64) will align mmap requests that don't have MAP_FIXED
set for architecture specific reasons).
Is there a reason why MAP_FIXED isn't used even though it probably should be?
I can't speak directly to your question, but you might try the version in config/host-darwin.[ch]. This implementation statically allocates a 1G array in the bss, unmaps it, and maps the PCH there. As the commentary indicates, it looks kludgy, but it does seem to make PCH more reliable.
I'm not absolutely clear on the details anymore, but I think you need host-darwin.c in your link, and host-darwin.h must be #included wherever you initialize your host langhooks.
(You could also try MAP_FIXED yourself; that's certainly easier than my suggestion above. :-)
stuart hastings Apple Computer
