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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wrong line number info for obj file compiled with -ffunction-sections"
href="https://bugs.llvm.org/show_bug.cgi?id=40703">40703</a>
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<th>Summary</th>
<td>wrong line number info for obj file compiled with -ffunction-sections
</td>
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<th>Product</th>
<td>tools
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>llvm-objdump
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>a.v.lapshin@mail.ru
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
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<pre>For the following test case wrong line number info shown by llvm-objdump :
$ cat function-sections-line-numbers.cpp
__attribute__((__noinline__)) int Pow(int number, int count);
int Pow(int number, int count)
{
int result = 1;
for (int i = 0; i < count; ++i)
{
result = result * number;
}
return result;
}
extern "C" int Func (void)
{
return Pow(6, 0);
}
$ clang -ffunction-sections -gdwarf-5 -O -c function-sections-line-numbers.cpp
-o bad.o
$ llvm-objdump -disassemble -line-numbers -r -s -section-headers -t bad.o
....
Disassembly of section .text._Z3Powii:
_Z3Powii:
; /home/avl/bugs/objdump_linenumbers/function-sections-line-numbers.cpp:5
0: 85 f6 testl %esi, %esi
; /home/avl/bugs/objdump_linenumbers/function-sections-line-numbers.cpp:22
2: 7e 12 jle 18 <_Z3Powii+0x16>
4: 83 fe 07 cmpl $7, %esi
7: 77 13 ja 19 <_Z3Powii+0x1c>
Note "function-sections-line-numbers.cpp:22" - is incorrect for the function
Pow.
I have a fix for that bug. But I would like to discuss it at llvm-dev first.</pre>
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