Building for 32-bit Linux target on 64-bit system

[dianarg]

I would like to cross-compile for 32-bit Linux targets from a 64-bit machine. I can't figure out the right combination of cmake variables / environment variables to get this to work. Does anyone have an example of how to build for a 32bit target?

This is what I have so far:

./prefetch_crt_dependency.sh
mkdir build32; cd build32
cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/install32 -DCMAKE_BUILD_TYPE=Release -DBUILD_ONLY="s3" -DCMAKE_C_FLAGS=-m32 -DCMAKE_CXX_FLAGS=-m32

The result is that dependencies such as libcurl and libcrypto are being picked up from /usr/lib64 instead of /usr/lib, e.g.

Using libcrypto from the cmake path.
-- Using libcrypto from system: /usr/lib64/libcrypto.so

and then later during make the build will fail.

I also tried using a toolchain file to set the C_FLAGS and CXX_FLAGS.

I think #1087 may be related, but I couldn't tell if that fix was ever merged.

[jmklix]

Have you taken a look at this example of how to cross compile with this sdk? The cmake argument they use looks like this:

cmake ../ -DBUILD_ONLY="s3;iam;sts" -DCMAKE_TOOLCHAIN_FILE="mips.toolchain.cmake" - DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=$CROSS_INSTALL_PREFIX -DCMAKE_PREFIX_PATH=$CROSS_INSTALL_PREFIX -DAUTORUN_UNIT_TESTS=OFF

[jmklix]

Going to mark this as answered. Please let us know if you still have problems building this sdk.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.