如何使用自动工具，make和gcc在64位（Ubuntu 12.04LTS）Linux上编译和安装32Bit库？

Question

I'm trying to compile a 32Bit version of a linux library on a 64Bit Ubuntu 12.04LTS running inside a VM (VirtualBox).

So far I've downloaded the source, unzipped it and performed the following steps to build the lib:

libtoolize --force
automake --add-missing
./configure --build=i686-pc-linux-gnu "CFLAGS=-m32" "CXXFLAGS=-m32" "LDFLAGS=-m32"
make
sudo make install

With this I've been able to build an compile the library but, once I run "readelf -h" on the compiled lib I get the following output:

  ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              DYN (Shared object file)
  Machine:                           Advanced Micro Devices X86-64
  Version:                           0x1
  Entry point address:               0x1ac0
  Start of program headers:          64 (bytes into file)
  Start of section headers:          53904 (bytes into file)
  Flags:                             0x0
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         7
  Size of section headers:           64 (bytes)
  Number of section headers:         35
  Section header string table index: 32

So I'm stuck with a 64Bit Version of the library and have not yet found a way to force the build and installation of a 32Bit Version. I'd be grateful for hints on how to solve this problem.

Answer 1

You only set --build in your options for ./configure . That means that ./configure should behave as if the program is being compiled on a 32-bit computer. If you want it to run on a 32-bit computer as well, you should use --host=i386-linux-gnu . So the real configure command you want to run is:

./configure --build=i386-linux-gnu --host=i386-linux-gnu