https://sourceware.org/bugzilla/show_bug.cgi?id=25611
Bug ID: 25611
Summary: [DWARF-5] support for checksums in .file directives
Product: binutils
Version: 2.35 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: ndesaulniers at google dot com
Target Milestone: ---
I was playing around trying to enable -gdwarf-5 in the Linux kernel, and hit an
issue where it looks like clang is emitting .file directives like:
.file 1 "/home/nick/linux/init/do_mounts.c" md5
0x62e8a195aa9d4d8b466f84b7775ea4cd
with GAS producing errors like:
do_mounts.s:19: Error: junk at end of line, first unrecognized character is `m'
A quick grep through the DWARF-5 spec [0] doesn't mention anything about
assembly directives. The docs on .file directives also doesn't mention this.
[1]
I assume this is maybe an extension that Clang implemented? IIUC, it's used by
debuggers to tell when/if a file has been modified.
Is this something that can be implemented in GNU as? I'm happy to also pursue a
command line flag in Clang to disable the emission of these checksums.
See also [2].
[0] http://www.dwarfstd.org/doc/DWARF5.pdf
[1] https://sourceware.org/binutils/docs/as/File.html#File
[2] https://bugs.llvm.org/show_bug.cgi?id=45040
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