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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang does not emit debug info for declaration"
href="https://bugs.llvm.org/show_bug.cgi?id=46514">46514</a>
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</tr>
<tr>
<th>Summary</th>
<td>clang does not emit debug info for declaration
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vries@gcc.gnu.org
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider the following test-case from the gdb testsuite:
...
$ cat psym-external-decl.c
extern int aaa;
int
main (void)
{
return aaa;
}
$ cat psym-external-decl-2.c
int aaa = 33;
...
Run with script compile.sh:
...
$ cat compile.sh
#!/bin/sh
$cc -c -g psym-external-decl.c
$cc -c psym-external-decl-2.c
$cc -g psym-external-decl.o psym-external-decl-2.o
gdb -batch a.out -ex "ptype aaa" -ex "p aaa"
...
With gcc, we have:
...
$ cc=gcc ./compile.sh
type = int
$1 = 33
...
And with clang-10:
...
$ cc=clang-10 ./compile.sh
type = <data variable, no debug info>
'aaa' has unknown type; cast it to its declared type
...
The difference is caused by missing debug info for the declaration of aaa in
psym-external-decl.c.
That is, with gcc, we have:
...
$ readelf -wi psym-external-decl.o | grep aaa
<2e> DW_AT_name : aaa
$
...
and with clang:
...
$ readelf -wi psym-external-decl.o | grep aaa
$
...
Is this a missing feature in clang, or is this explicitly unsupported?</pre>
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