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From: "ks132 at yandex dot ru" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/18601] New: Can't set breakpoint on function with abi_tag
 attribute
Date: Thu, 25 Jun 2015 20:15:00 -0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: c++
X-Bugzilla-Version: 7.9
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X-Bugzilla-Who: ks132 at yandex dot ru
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https://sourceware.org/bugzilla/show_bug.cgi?id=18601

            Bug ID: 18601
           Summary: Can't set breakpoint on function with abi_tag
                    attribute
           Product: gdb
           Version: 7.9
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: ks132 at yandex dot ru
  Target Milestone: ---

[ks@localhost ~]$ cat test.cpp 
void f(int) __attribute ((abi_tag ("foo")));

void f(int) {
}

int main()
{
  f(42);
}
[ks@localhost ~]$ g++ -g test.cpp
[ks@localhost ~]$ 
[ks@localhost ~]$ nm -C a.out|grep foo
00000000004005b6 T f[abi:foo](int)
[ks@localhost ~]$ 
[ks@localhost ~]$ gdb -q a.out
Reading symbols from a.out...done.
(gdb) b 'f[abi:foo](int)' 
No source file named f[abi.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) 

GCC 5.1 uses abi_tag attribute for Dual ABI implementation:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html

This makes impossible to set breakpoints on some functions with new ABI, which
is enabled by default:
https://gcc.gnu.org/gcc-5/changes.html#libstdcxx

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