Brian, thank you very much, for your soon response. regards, Herbert > Date: Thu, 10 Jul 2008 12:45:27 -0700 > From: brian@xxxxxxxxxxx > To: herbertsg@xxxxxxxxxxx > CC: gcc-help@xxxxxxxxxxx > Subject: Re: `GLIBCXX_3.4.9' not found > > Herbert Saal wrote: > >> What can i do? > > With symbol versioning, compatibility works backwords but not forwards > -- a binary built against an older libstdc++ should normally function > correctly with a newer libstdc++ found on the machine at runtime. Thus > the solution is to install the oldest version of gcc you wish to support > on your development machine and link with it. This doesn't mean you > necessarily need to use this old version of gcc to develop with, as you > can have as many versions installed on the machine as you want. Just > use the old version to produce the final binary. > >> One option i think is to static compile the libstdc++ library in my shared library. what is the instruction to do that? > > That's a very bad idea. Static linking works well for programs, but for > a shared library it's going to be a nightmare because it means your lib > will be loaded into a program that is likely dynamically linked against > some other version of libstdc++. Thus you get essentially two copies of > libstdc++ code, and if you try to pass objects between your code in your > shared library and the code in the main program you have to ensure that > all data structures are laid out exactly the same or compatible, > otherwise you get random crashes or other unexplainable behavior. In > other words, this solves nothing but just makes the problem ten times > harder to debug. Not to mention the practical issue that the code in > the static libstdc++ archive is not built PIC and so you can't link it > into a shared library (the exception being i386, where it's allowed but > with a performance penalty of relocs that make your text section > non-sharable so what's the point.) > > Brian _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us
