How to get debug mode version of libstdc++ when compiling GCC

[Pit Cuppens]

Dear all,

I have recently heard that libstdc++ comes
with assertion checks, and that one can
enable them using the "-D_GLIBCXX_DEBUG"
comiler flag. For instance, compiling

#include <vector>

int main(int,char **) {
  std::vector<int> v;
  v[3] = 2;
}

with -D_GLIBCXX_DEBUG would result in a
runtime error mesage. Wonderful!

So I tried this with my GCC compiler, 3.3.2,
which I downloaded and built myself according
to the instruction on http://gcc.gnu.org/install;
my command line was

  ./configure --enable-languages=c++

To my surprise, the above program resulted
in a segmentation fault, no error message,
no assertions. I guess that libstdc++ was
not configured to enable the debugging mode,
am I right?

So how can I do this? Do I have to pass
--enable-debug to the above configuration
line of GCC? Will the GCC-config-script
pass this along to libstdc++ and in this
way configure libstdc++ the way I want it?

Of course, I tried to read the manuals at

   http://gcc.gnu.org/onlinedocs/libstdc++/install.html

However, after reading this, I am not really
sure what to do. So please excuse my ignorance;
any help is highly appreciated.

Many thanks and best regards,
Pit

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