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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llvm-extract alters linkage of symbols"
href="http://llvm.org/bugs/show_bug.cgi?id=15567">15567</a>
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<th>Summary</th>
<td>llvm-extract alters linkage of symbols
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>3.2
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>bruce.mitchener@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10221" name="attach_10221" title="Example C file for the bug">attachment 10221</a> <a href="attachment.cgi?id=10221&action=edit" title="Example C file for the bug">[details]</a></span>
Example C file for the bug
I've reproduced this with the 3.2 release.
If you take a simple program like the attached extract.c and compile it:
clang -emit-llvm -o extract.bc -c extract.c
And then decide that you want to delete the 'foo' symbol from it:
llvm-extract -delete -func=foo -o failed.bc extract.bc
Things that were previously private linkage are now hidden visibility instead:
llvm-dis failed.bc
llvm-dis extract.bc
And then diffing the 2 .ll files:
--- extract.ll 2013-03-22 08:42:09.000000000 +0700
+++ failed.ll 2013-03-22 08:42:06.000000000 +0700
@@ -1,14 +1,9 @@
-; ModuleID = 'extract.bc'
+; ModuleID = 'failed.bc'
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
-@.str = private unnamed_addr constant [21 x i8] c"Going to delete foo.\00",
align 1
-@.str1 = private unnamed_addr constant [14 x i8] c"Hello, world\0A\00", align
1
-
-define void @foo() nounwind uwtable ssp {
- %1 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([21 x i8]*
@.str, i32 0, i32 0))
- ret void
-}
+@.str = hidden unnamed_addr constant [21 x i8] c"Going to delete foo.\00",
align 1
+@.str1 = hidden unnamed_addr constant [14 x i8] c"Hello, world\0A\00", align 1
declare i32 @printf(i8*, ...)
So we can see that .str and .str1 went from 'private unnamed_addr constant' to
'hidden unnamed_addr constant'</pre>
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