On Fri, Jan 29, 2021 at 1:11 PM Jakub Jelinek [off-list ref] wrote:

On Fri, Jan 29, 2021 at 01:05:56PM -0800, Nick Desaulniers wrote:

quoted

quoted

Wasn't that fixed in GAS?
https://sourceware.org/bugzilla/show_bug.cgi?id=27195

$ make LLVM=1 -j72 defconfig
$ ./scripts/config -e DEBUG_INFO -e DEBUG_INFO_DWARF5
$ make LLVM=1 -j72
...
/tmp/init-d50d89.s: Assembler messages:
/tmp/init-d50d89.s:10: Error: file number less than one
/tmp/init-d50d89.s:11: Error: junk at end of line, first unrecognized
character is `m'

which is https://sourceware.org/bugzilla/show_bug.cgi?id=25611.

$ as --version | head -n1
GNU assembler (GNU Binutils for Debian) 2.35.1

Maybe GAS should not need to be told -gdwarf-5 to parse these?  Then
we would not need to pass -Wa,-gdwarf-5 via clang with
-no-integrated-as.

That is what sw#27195 is about, just try current binutils 2.35, 2.36 or
trunk branches.

Ok, yep, I can confirm.  I just built ToT binutils and I no longer
need to specify -Wa,-gdwarf-5 when building with clang with
-no-integrated-as.

I will update scripts/test_dwarf5_support.sh to check for that and
update the comments/documentation/commit messages to say binutils
2.35.2+, link to https://sourceware.org/bugzilla/show_bug.cgi?id=27195
instead, then drop hunk that was passing -Wa,-gdwarf-5.
-- 
Thanks,
~Nick Desaulniers