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BUILDING-32-BIT-BINARIES.md

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Building 32-bit binaries

Holy Build Box also provides the Docker image phusion/holy-build-box-32. This image contains a 32-bit CentOS environment, and is suitable for building 32-bit executables. This image is used in the same way as the 64 variant, BUT you have to prepend any commands with a call to linux32. This ensures that all processes inside the container will think that it's running on a 32-bit system, despite the fact that the kernel is 64-bit. If you do not call linux32, then some applications' build systems will become confused: they will try to invoke the compiler with 64-bit compilation flags, which of course fails because the actual environment is 32-bit.

For example, instead of invoking this...

docker run -t -i --rm \
  -v `pwd`:/io \
  phusion/holy-build-box-64:latest \
  bash /io/compile.sh

...invoke this:

docker run -t -i --rm \
  -v `pwd`:/io \
  phusion/holy-build-box-32:latest \
  linux32 bash /io/compile.sh