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Bug 9 - LLVM needs explicit support for weak variables
Summary: LLVM needs explicit support for weak variables
Status: RESOLVED FIXED
Alias: None
Product: tools
Classification: Unclassified
Component: llvm-gcc (show other bugs)
Version: trunk
Hardware: PC Linux
: P normal
Assignee: Chris Lattner
URL:
Keywords: miscompilation
Depends on:
Blocks:
 
Reported: 2003-10-07 15:42 PDT by Chris Lattner
Modified: 2010-02-22 12:50 PST (History)
1 user (show)

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Description Chris Lattner 2003-10-07 15:42:57 PDT 
Compile this program with the C frontend:

-----
int X;
-----

X is removed from the translation unit.  In C, the variable must be declared as
weak, and since LLVM has no notion of the difference between "linkonce" and
"weak", the optimizer things the variable is safe to delete.
Comment 1 Chris Lattner 2003-10-09 23:54:53 PDT 
This is tested by: GlobalDCE/2003-10-09-PreserveWeakGlobals.ll
Comment 2 Chris Lattner 2003-10-10 00:30:30 PDT 
This has been fixed in the C Frontend.  This just needs to be fixed in LLVM proper.
Comment 3 Chris Lattner 2003-10-16 13:29:45 PDT 
Weak linkage is now implemented