https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65669
Bug ID: 65669
Summary: Don't emit debug info for fake_ostream version of cerr
(and others)
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dje at google dot com
While trying to debug a massive gdb performance issue with printing std::cerr
I'm wasting time trying to create a good testcase. In one program std::cerr is
a typedef of ostream (which I expect and need) and in my testcase I'm always
getting a typedef of fake_ostream. I think the reason is due to differences in
how the testcase is built and gdb is just happening to pick up the fake_ostream
version from the symbol table.
>From reading src/c++98/globals_io.cc I can appreciate the need for something
like this, but is there a reason to emit debug info for the fake_ostream
version?
If I manually strip out the debug info for globals_io.o, rebuild libstdc++.so,
and reinstall, then I get the proper definition.
[
Although I have to work around a gdb bug to do it:
(gdb) p std::cerr
No symbol "cerr" in namespace "std".
(gdb) mt flush-sym
(gdb) mt expand ios_init.cc
(gdb) p std::cerr
$1 = ...
]
With the fake_ostream version I see a char array, which isn't very helpful. :-)
Repro:
#include <iostream>
int
main ()
{
std::cerr << "Yikes!\n";
return 0;
}
bash$ gdb a.out
(gdb) start
(gdb) p std::cerr
