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Date:      Fri, 17 Apr 2020 20:20:04 +0000 (UTC)
From:      Conrad Meyer <cem@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r360054 - head/sys/conf
Message-ID:  <202004172020.03HKK4ex000862@repo.freebsd.org>

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Author: cem
Date: Fri Apr 17 20:20:03 2020
New Revision: 360054
URL: https://svnweb.freebsd.org/changeset/base/360054

Log:
  xen-locore: Silence DWARF2 section warning
  
  Silence the "DWARF2 can only represent one section per compilation unit"
  warning in amd64 GENERIC builds by disabling Clang's debuginfo generation for
  this assembler file (-g0).  The message is replaced by a warning from
  ctfconvert that there is no debuginfo to convert (future work).
  
  The file contains some metadata (several ELF notes) and some code.  The code
  does not appear to have anything that debuginfo would aid.
  
  I looked at the generated debuginfo (readelf -w xen-locore.o) prior to this
  change, and the metadata that would be disabled are things like associated
  between binary offset and code line number (not especially useful with a
  disassembler), and label metadata for the entry points (not especially useful
  as this is already in the symbol table).
  
  Reviewed by:	royger
  Differential Revision:	https://reviews.freebsd.org/D24384

Modified:
  head/sys/conf/files.amd64

Modified: head/sys/conf/files.amd64
==============================================================================
--- head/sys/conf/files.amd64	Fri Apr 17 19:14:05 2020	(r360053)
+++ head/sys/conf/files.amd64	Fri Apr 17 20:20:03 2020	(r360054)
@@ -112,7 +112,8 @@ amd64/amd64/in_cksum.c		optional	inet | inet6
 amd64/amd64/initcpu.c		standard
 amd64/amd64/io.c		optional	io
 amd64/amd64/locore.S		standard	no-obj
-amd64/amd64/xen-locore.S	optional	xenhvm
+amd64/amd64/xen-locore.S	optional	xenhvm \
+	compile-with "${NORMAL_S} -g0"
 amd64/amd64/machdep.c		standard
 amd64/amd64/mem.c		optional	mem
 amd64/amd64/minidump_machdep.c	standard



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