The Windows 32 bit build was recently removed:

• gitian: Remove Windows 32 bit build #15939: gitian: Remove Windows 32 bit build

This leaves us with the following supported 32 bit platforms:

• arm-linux-gnueabihf (compiled in Travis)
• i686-pc-linux-gnu (compiled and tested in Travis)

As the number of developers testing on these platforms decrease the probability of errors due to incorrect assumptions about sizeof(size_t), sizeof(time_t) and sizeof(long) is likely to increase.

Additionally we risk incorrectly assuming that reported errors on said platforms are 32 bit only bugs: the recent GCC miscompilation issue would likely have been identified much faster if it wasn't thought to be "merely" an i686-pc-linux-gnu issue for the first six months after being reported (see history in #14580: 32-bit test failure: test/crypto_tests.cpp).

Questions:

1. What can be done to improve testing under these platforms until we drop support?
2. In which order do we envision dropping support for the mentioned platforms?