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[Bug c++/12273] New: demangled symbol names unrecognised innon-debug builds
- From: "taviso at cmpxchg8b dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Mon, 29 Nov 2010 16:47:00 +0000
- Subject: [Bug c++/12273] New: demangled symbol names unrecognised innon-debug builds
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=12273
Summary: demangled symbol names unrecognised in non-debug
builds
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned@sourceware.org
ReportedBy: taviso@cmpxchg8b.com
DSOs that export mangled symbols are unrecognised in their mangled form this
used to work in 7.1, but for some reason doesn't seem to work any more. I'm not
sure what changed that caused it to break.
You can reproduce the problem like this, create an object with an exported
mangled symbol:
$ cat dynsym.cc
#include <stdio.h>
class GDB {
public:
static int whatever (void) {
return fprintf(stderr, "Hello World\n");
}
};
int main(int argc, char **argv)
{
return GDB::whatever();
}
$ g++ -export-dynamic dynsym.cc -s -o dynsym
Verify the symbol is present:
$ nm -D dynsym | c++filt | grep GDB
00000000004008ca W GDB::whatever()
Try to break on the demangled symbol name:
$ gdb -q ./dynsym
(gdb) b GDB::whatever()
Can't find member of namespace, class, struct, or union named "GDB::whatever"
Hint: try 'GDB::whatever()<TAB> or 'GDB::whatever()<ESC-?>
(Note leading single quote.)
Note that if I use the mangled symbol name directly, GDB accepts it.
(gdb) b _ZN3GDB8whateverEv
Breakpoint 1 at 0x4008ce
(gdb) r
Breakpoint 1, 0x00000000004008ce in GDB::whatever() ()
I don't think this is a problem with not recognising the symbols, as
it's listed as a completion target if I try to complete on symbol
names, and info address works:
(gdb) info address GDB::whatever()
Symbol "GDB::whatever()" is at 0x4008ca in a file compiled without debugging.
This used to work, in a vanilla GDB 7.1:
$ gdb dynsym
GNU gdb (GDB) 7.1
(gdb) b GDB::whatever()
Breakpoint 1 at 0x8048639
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