Bug 1466373 - Type-pun warnings in compiler-rt build
Summary: Type-pun warnings in compiler-rt build
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: dotNET
Classification: Red Hat
Component: rh-dotnet20
Version: 2.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ga
: 2.0
Assignee: Omair Majid
QA Contact: jiri vanek
Les Williams
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-06-29 13:43 UTC by Omair Majid
Modified: 2017-07-25 20:40 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2017-07-25 20:40:13 UTC
Target Upstream Version:
Embargoed:

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Description Omair Majid 2017-06-29 13:43:32 UTC 
type-punning build warnings in compiler-rt pointed out by errata tool:

Type pun (strict-aliasing) warning seen in x86_64 build log:
   1290  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc: In function '__sanitizer::u16 __sanitizer_unaligned_load16(const uu16*)':
   1291  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc:586:32: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   1294  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc: In function '__sanitizer::u32 __sanitizer_unaligned_load32(const uu32*)':
   1295  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc:592:32: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   1298  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc: In function 'void __sanitizer_unaligned_store16(__sanitizer::uu16*, __sanitizer::u16)':
   1299  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc:604:39: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   1302  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc: In function 'void __sanitizer_unaligned_store32(__sanitizer::uu32*, __sanitizer::u32)':
   1303  /builddir/build/BUILD/compiler-rt-3.9.1.src/lib/msan/msan.cc:612:39: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
Comment 1 Omair Majid 2017-07-25 20:33:13 UTC 
I dont think this is a real problem in our case.

1. This affects the memory sanitizer. We dont need it and do not
really care about it.

2. The issue also exists in latest Fedora builds (compiler-rt 4.x),
which use a newer gcc. Even that doesn't seem to cause any oversable
issues.
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