Debugging map> in gdb

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.

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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?

enter image description here

I `call` the iterator functions and evaluate the results after manipulating the iterators. — manasij7479, Jun 20 '13 at 07:53
possible duplicate of [How do I print the elements of a C++ vector in GDB?](http://stackoverflow.com/questions/253099/how-do-i-print-the-elements-of-a-c-vector-in-gdb) — ks1322, Jun 20 '13 at 10:11
just `unique_ptr`: https://stackoverflow.com/questions/22798601/how-to-debug-c11-code-with-unique-ptr-in-ddd-or-gdb — Ciro Santilli OurBigBook.com, Sep 24 '17 at 12:25

score 0 · Answer 1 · edited May 23 '17 at 12:02

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.

score 0 · Accepted Answer · edited May 23 '17 at 10:30

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.

Copy the .gdbinit in ~/
Restart the gdb
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

Debugging map> in gdb

2 Answers2