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[Bug gas/27221] New: Commit 058430b4a1ed7441dfc2e167bfdb9dc89ea9a209 int


From: natechancellor at gmail dot com
Subject: [Bug gas/27221] New: Commit 058430b4a1ed7441dfc2e167bfdb9dc89ea9a209 introduces warnings while assembling the Linux kernel
Date: Wed, 20 Jan 2021 21:58:59 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=27221

            Bug ID: 27221
           Summary: Commit 058430b4a1ed7441dfc2e167bfdb9dc89ea9a209
                    introduces warnings while assembling the Linux kernel
           Product: binutils
           Version: 2.37 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: natechancellor at gmail dot com
  Target Milestone: ---

When I build some Linux kernel targets with tip of tree binutils, I see a
series of warnings like:

Warning: dwarf line number information for ... ignored

It looks like this was introduced by 058430b4a1ed7441dfc2e167bfdb9dc89ea9a209
according to my bisect. This is quite noisy in my builds as I see it with a
variety of configurations and architectures. For example, with the attached
cache-v7.s from the arch/arm directory:

$ as-new -EL -mfloat-abi=soft -march=armv7-a -mfpu=vfp -mno-warn-deprecated
-gdwarf-2 -o /dev/null cache-v7.s
arch/arm/mm/cache-v7.S:84: Warning: dwarf line number information for
.alt.smp.init ignored
arch/arm/mm/cache-v7.S:100: Warning: dwarf line number information for
.alt.smp.init ignored                                                          
                                                                               
                                      arch/arm/mm/cache-v7.S:105: Warning:
dwarf line number information for .alt.smp.init ignored
arch/arm/mm/cache-v7.S:200: Warning: dwarf line number information for
.alt.smp.init ignored                                                          
                                                                               
                                      arch/arm/mm/cache-v7.S:218: Warning:
dwarf line number information for .alt.smp.init ignored
arch/arm/mm/cache-v7.S:310: Warning: dwarf line number information for
.alt.smp.init ignored

Is this intentional? If so, what is the fix?

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