[Bug gdb/12192] New: attaching gdb to running mach-o process does not load shared libraries and debug symbols

["gdb at tmm1 dot net" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12192

           Summary: attaching gdb to running mach-o process does not load
                    shared libraries and debug symbols
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: gdb@tmm1.net


$ ../gdb/gdb -v
GNU gdb (GDB) 7.2.50.20101104-cvs
This GDB was configured as "x86_64-apple-darwin10".

$ uname -a
Darwin aman-guptas-imac.local 10.4.0 Darwin Kernel Version 10.4.0: Fri Apr 23
18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386 i386

Build a simple test case:

$ echo "int main() { while(42) sleep(1); }" > main.c
$ gcc -o main main.c
$ ./main &
[1] 67119
$ export PID=$!

Attach to running process (no debug info):

$ ../gdb/gdb -ex "attach $PID" -ex "where" -ex "detach" -ex "quit"

#0  0x00007fff85d18eb6 in ?? ()
#1  0x00007fff85d18d45 in ?? ()
#2  0x2c3e4603000c5877 in ?? ()
#3  0x00ffffffffffffff in ?? ()

Run the process inside gdb instead (works):

$ ../gdb/gdb ./main -ex 'run' -ex 'where' -ex 'quit'

#0  0x00007fff85d18eb6 in __semwait_signal () from /usr/lib/libSystem.B.dylib
#1  0x00007fff85d18d45 in nanosleep () from /usr/lib/libSystem.B.dylib
#2  0x00007fff85d65b14 in sleep () from /usr/lib/libSystem.B.dylib
#3  0x0000000100000f2b in main ()

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