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Cross-Compiling on Unix
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## Cross-Compiling on Unix

The purpose of cross-compiling is to build a Berkeley DB library on one platform that is to be used on a different platform. This section demonstrates how to build a library compatible with the ARM platform from a 32-bit x86 Linux platform. You will need to adjust the build tools and options to match your particular platforms.

1. Download, install, and test a toolchain that can build the desired target binaries. In this example, we use the `arm-linux-gnueabi-gcc` package.

2. Decide on your configuration options, and set up your environment to use the appropriate compiler and compiler tools. It is often easiest to set this up as a small shell script. For example:

       #!/bin/sh -f
       env \
       CC=/usr/bin/arm-linux-gnueabi-gcc \
       STRIP=/usr/bin/arm-linux-gnueabi-strip \
       ../dist/configure \
       --build=i686-pc-linux-gnu \
       --host=arm-linux-gnueabi \
       --enable-java \
       --enable-sql \
       --enable-jdbc \
       --enable-smallbuild \
       --enable-shared \
       --enable-stripped_messages \
       --prefix=$HOME/ARM-linux/install \
       $*

   The `--build` flag indicates the system on which you are compiling and the `--host` flag indicates the target platform. Adjust or omit the `--enable` and `--prefix` flag settings as dictated by your own needs.

3. Unpack your Berkeley DB distribution and go to the `build_unix` directory. Alternatively, you may create a more appropriately-named directory at the same level and build in it. For example, `build_arm`.

4. In your build directory, configure by executing your script, then `make` and `make install`. Review any compiler warnings and fix if necessary, repeating the `configure` and `make` steps until you are satisfied. The resulting libraries and executables can then be transferred to your target system.

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