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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - weak symbol should be ignored for optimisation like early CSE ."
href="https://bugs.llvm.org/show_bug.cgi?id=45733">45733</a>
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<th>Summary</th>
<td>weak symbol should be ignored for optimisation like early CSE .
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>umesh.kalappa0@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23420" name="attach_23420" title="patch file .">attachment 23420</a> <a href="attachment.cgi?id=23420&action=edit" title="patch file .">[details]</a></span>
patch file .
The following C case
$cat weak.c
#pragma weak x
const int x = 5;
int f ()
{ return x; }
$ clang -O2 -S weak.c
$ cat weak.s
.text
.file "weak.c"
.globl f # -- Begin function f
.p2align 4, 0x90
.type f,@function
f: # @f
.cfi_startproc
# %bb.0:
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
movl $5, %eax
popq %rbp
.cfi_def_cfa %rsp, 8
retq
the variable "x" can be override by other object /compilation unit ,so
propagating the constant in the function "f" is not right .
attached the patched file (weak.patch), fixes the issue .
so we raise a code review after testing .</pre>
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