Linking using g++ fails searching for -lstdc++

Question

I\'m trying to use someone else\'s Makefile to complile a very simple c++ library. The makefile is as follows:

JNIFLAGS=-O2 -pthread -I/usr/lib/jvm/java-6-su         


        

Answer 1

Posting for future reference, a solution I found was to install g++-multilib. I had the same incompatible problem relating to -lstdc++ on g++ version 4.6.1

On further probing: g++-multilib is a dummy package which installed g++4.6-multilib which in turn installed the appropriate libstdc++.so under the /usr/lib/gcc/x86_64-linux-gnu/4.6/32 folder.

Answer 2

It seems you're compiling a 32 bit library on a 64 bit machine, however a 32 bit version of libstdc++ is not present.

Try apt-get install ia32-libs libc6-i386 libc6-dev-i386 lib32gcc1 lib32stdc++6

(btw. you're producing a .so , you should specify -fPIC when compiling your .cpp files as well)

Answer 3

Answering my own question:

Ths solution seems to be a bit of a hack, you need to create a symlink for the 32 bit version of the library (after installing the packages mentioned in @nos's answer):

$ sudo ln -s /usr/lib32/libstdc++.so.6 /usr/lib32/libstdc++.so

Once you've done this, the linker will automagically find the correct library to use.