Using 32bit .so file in a 64bit environment

Question

I am using Ubuntu 12.04 64bit and I am getting the following error while compiling a Qt project which needs a 32bit .so file.

error: skipping incompatible /opt/lib/libEposCmd.so when searching for -lEposCmd

I want to compile this project with -m32 option but I don't know where should I insert this option.

Answer 1

Problem Solved through below instruction:

• installing g++-multilib, libstdc++.i386, libgcc.i386, glibc-devel.i386, gcc-c++-32bit

• edite make file and adjust below config:

  cc = add -m32
  CFLAGS = add -m32
  INCPATH = linux-g++-32
  LFLAGS = -m32 -w1, -o1
  LIBS = i386-linux-gnu
  

• make softlink of

  /usr/lib/i386-GNU-linux/libQtCore.so.4.1
                      libQtGui.....
                      libQtXmlPattern..
                      libQtXml.....
  

  to lib .... .so.o then to lib .... .so make clean and compile