http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56783
Bug #: 56783
Summary: g++ does not supply signatures for gdb on g++ 4.7
versions
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: dick.guer...@gmail.com
Steps to reproduce:
On Snow Leopard, compile c-programs with -g option using g++ to create a linked
module for execution. Use gdb to read the module, and attempt to set
breakpoints. No symbols are found. g++ no longer places the "signatures" in
the linked module, or the object decks, so gdb can't find the signatures to
satisfy something like: break emsvc.c:DoSVC ; However, the same source
compiled with g++ and linked on Tiger, when copied to Snow Leopard, can set
breakpoints.
Actual results:
dickguertin$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/bin/../libexec/gcc/x86_64-apple-darwin11.4.0/4.7.1/lto-wrapper
Target: x86_64-apple-darwin11.4.0
Configured with: ../gcc-4.7.1/configure --enable-languages=fortran
Thread model: posix
gcc version 4.7.1 (GCC)
dickguertin$ gdb -q emg 2>/dev/null
Reading symbols for shared libraries ..... done
(gdb) maint print psymbols emg.sym
(gdb) break emsvc.c:DoSVC
Function "DoSVC" not defined in file emsvc.c.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) quit
dickguertin$
Expected results:
In the command sequence shown above, the breakpoint should have been set. The
"maint" command creates a symbol-table text-file (emg.sym), which shows that
the signatures are no longer included in either the object decks or linked
module (emg). Similar commands on Tiger produce symbol-tables with signatures,
and breakpoints can be found (and set) by gdb on Tiger, and even the gdb on
Snow Leopard.
