This is a public service announcement that for some time already, the cc -m32 is functional on HEAD amd64.
I believe that all headers important for the usermode application compilation from the base system, were converted to providing ILP32/LP64 correct definitions on x86. This was mostly done by merging the i386 and amd64 version and moving the resulting common header to include/x86 directory. The bulk of the work was performed by Tijl Coosemans. The csu object files and libraries are already there in /usr/lib32. I did not verified if the stock build of gcc is aware of library location for -m32 though. We do not have ports support for multiarch, but the base system is finally provides the neccessary foundation.
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