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Bug 64 - [constmerge] Constant merging pass merges constants with external linkage
Summary: [constmerge] Constant merging pass merges constants with external linkage
Status: RESOLVED FIXED
Alias: None
Product: libraries
Classification: Unclassified
Component: Interprocedural Optimizations (show other bugs)
Version: 1.0
Hardware: PC Linux
: P normal
Assignee: Chris Lattner
URL:
Keywords: compile-fail
Depends on:
Blocks:
 
Reported: 2003-10-28 23:53 PST by Chris Lattner
Modified: 2010-02-22 12:50 PST (History)
1 user (show)

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Description Chris Lattner 2003-10-28 23:53:00 PST 
The constant merging pass has no qualms about merging constants with external
linkage, which causes link errors later.  It should only merge constants away
that have internal linkage.

This is tested as:
test/Regression/Transforms/ConstantMerge/2003-10-28-MergeExternalConstants.ll

This causes undefined symbols in libstdc++, specifically "std::ios_base::badbit".
Comment 1 Chris Lattner 2003-10-29 00:03:59 PST 
This is now fixed:
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20031027/008939.html