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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - lld: define special symbols _etext and _edata"
href="https://llvm.org/bugs/show_bug.cgi?id=26729">26729</a>
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<th>Summary</th>
<td>lld: define special symbols _etext and _edata
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>FreeBSD
</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>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>emaste@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Blocks</th>
<td>23214
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In addition to _end, other linkers define _etext and _edata as the first
address after the text and data segment respectively. GNU GDB in the FreeBSD
base system relies on _etext and fails to build with lld.
Demonstration code:
% cat end_syms.c
#include <stdio.h>
#include <stdlib.h>
extern char etext, edata, end;
int
main(int argc, char *argv[])
{
printf("etext: %p\n", &etext);
printf("edata: %p\n", &edata);
printf("end: %p\n", &end);
}
% cc -fuse-ld=bfd end_syms.c
% ./a.out
etext: 0x4007e6
edata: 0x600aa4
end: 0x600ab8
% cc -fuse-ld=lld end_syms.c
udefined symbol: edata in /tmp/end_syms-2375e5.o
undefined symbol: etext in /tmp/end_syms-2375e5.o
cc: error: linker command failed with exit code 1 (use -v to see invocation)</pre>
</div>
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