https://sourceware.org/bugzilla/show_bug.cgi?id=17541
Bug ID: 17541
Summary: addr2line: function names in anonymous namespaces are
incorrectly reported.
Product: binutils
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: toojays at toojays dot net
When addr2line is asked to print a function name for a C++ method in an
anonymous namespace, it prints only the method name. It does not include the
namespace, class, or method argument list. This occurs regardless of whether
the --demangle argument is given on the command line. This means there is no
way to get the correct mangled name from addr2line.
Testcase:
jscott@citra:/tmp$ cat foo.cpp
#include <stdio.h>
#include <execinfo.h>
namespace ns {
namespace {
class A
{
public:
A (int x);
private:
int m_x;
};
A::A (int x) : m_x(x)
{
void *bt_buffer[10];
int depth = ::backtrace(bt_buffer, sizeof(bt_buffer)/sizeof(bt_buffer[0]));
char **bt = ::backtrace_symbols(bt_buffer, depth);
::printf("%s\n", *bt);
}
} /* unnamed namespace */
} /* namespace ns */
int main (void)
{
ns::A a(1);
return 0;
}
jscott@citra:/tmp$ g++ -o foo -g foo.cpp -O0 -Wall -Wextra
jscott@citra:/tmp$ ./foo | sed -ne 's/.*\[\(.*\)\].*/\1/p' | addr2line -f --exe
./foo -C
A
/tmp/foo.cpp:19
This issue occurs with at least the following versions:
2.25.51.20141103 (git)
GNU addr2line (GNU Binutils for Ubuntu) 2.24
GNU addr2line version 2.23.52.0.1-8.el6 20130226
It does not occur with:
GNU addr2line version 2.20.51.0.2-5.36.el6 20100205
With this version, the above testcase (using the same binary as before, built
with GCC 4.9.1) looks like:
(centos-6)jscott@citra:/tmp$ ./foo | sed -ne 's/.*\[\(.*\)\].*/\1/p' |
addr2line -f --exe ./foo -C
ns::(anonymous namespace)::A::A(int)
foo.cpp:0
So it seems that with old binutils, I can get the correct function name, but
the wrong line number. With the new binutils, I can get the correct line
number, but the wrong function name. Any way we can fix it so I can have both?
:)
[If I run my "old" addr2line against a binary built with the corresponding
"old" GCC (4.4.7 on Centos 6), it shows the same wrong behaviour as the "new"
addr2line: correct line number, incorrect function name. Likewise if I build
with GCC 4.9.1, but with -gdwarf-2.]
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