调试图 <int, unique_ptr<A> &gt;在gdb中

Question

I use g++ 4.8 that supports c++ 11 feature on my mac.

/opt/local/bin/g++-mp-4.8

I also use gdb 6.3.50.

GNU gdb 6.3.50-20050815 (Apple version gdb-1822) (Sun Aug  5 03:00:42 UTC 2012)
Copyright 2004 Free Software Foundation, Inc.
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This GDB was configured as "x86_64-apple-darwin".

My code has a lot of maps or vectors that has unique_ptr, and it's really pain to debug them as I see no information about the elements in the map or vector.

I tried to make a utility method and call them in gdb, but it doesn't seem to work. It doesn't throw error message, but it also shows nothing.

void testPrint( map<int, unique_ptr<GroupContextSummary>> & m, int i )
{
    cout <<  m[i].get()->to_string() << endl;
}

Are there any ways to see the elements in the map/vector?

Answer 1

This post has some hints that gdb 7 may solve this issue.

Gdb on MacOSX lion

brew install https://raw.github.com/Homebrew/homebrew-dupes/master/gdb.rb

Then I needed codesign.

==> ./configure --prefix=/usr/local/Cellar/gdb/7.6 --with-python=/usr --with-system-readline
==> make
==> make install
==> Caveats
gdb requires special privileges to access Mach ports.
You will need to codesign the binary. For instructions, see:

  http://sourceware.org/gdb/wiki/BuildingOnDarwin

Or you can just run gdb from sudo.

Gdb 7.0 could be compiled and built on my Mac, but it doesn't correctly debug the program. I hope next version of gdb on Mac will solve the issues.

Answer 2

I could debug map and vector without using gdb 7, but with pretty printer setup.

This site( http://www.yolinux.com/TUTORIALS/GDB-Commands.html#STLDEREF ) has the procedure. In short.

1. Copy the .gdbinit in ~/
2. Restart the gdb
3. Use pvector for printing vectors.

Please refer to this page: https://stackoverflow.com/a/17246292/260127 And this page: How to print out the content in vector<unique_ptr> with gdb on Mac OS X