On Wed, Oct 19, 2011 at 5:50 AM, Delcypher <delcypher@xxxxxxxxx> wrote: > > 3. Now here's where I get confused the documentation says "When > configuring libstdc++, you'll have to configure the entire gccsrcdir > directory." > > Isn't that going to build everything though? I don't want to do that. > Surely I want to run > > $ ../gcc-root/libstdc++-v3/configure --enable-libstdcxx-debug > --prefix=$HOME/local > > and NOT (as the documentation suggests) > > $ ../gcc-root/configure --enable-languages=c++ > --enable-libstdcxx-debug --prefix=$HOME/local It's hard to know what to say when you decide that the documentation is wrong. I understand what you are trying to do, but it is not supported. > and the build fails. The output is shown here http://pastebin.com/p4iD7h4i The failure appears to be that you are compiling libstdc++ with a different version of g++. In general you must build libstdc++ with the version of g++ that it is shipped with. libstdc++ includes non-standard code which is dependent on the specific version of the compiler. > The reason I'm trying to do this is so I can build programs on my > system and debug the standard library objects. For example when in gdb > if I try to do the following > gdb) call cout.good() > Couldn't find method std::ostream:;good > > I presume this error message is because my version of libstdc++ has no > debugging symbols. The ordinary build of libstdc++ always builds with debugging symbols. If you do not have debugging symbols on your system, it is because the library has been stripped for some reason. > I did try compiling with `-D_GLIBCXX_DEBUG' and for > someone reason that I can't explain that made some standard library > objects I declared in the stack accessible via gdb (e.g. if I had an > ifstream object called inputFile) despite the fact my version of > libstdc++ has no debugging symbols at all! Many functions in libstdc++ are inlined from header files, and as such are affected by the use of -g when you compile, rather than whether -g was used when libstdc++ itself was built. Note that -D_GLIBCXX_DEBUG does not affect whether debugging symbols are generated; it produces a debugging version of the code which adds runtime checks to make sure that functions are being used correctly. Ian
