This describes porting the Hare compiler to OpenBSD by cloning the compiler repository, copying rt/+freebsd into a new rt/+openbsd directory, and making platform-specific edits to files like rt/+openbsd/errno.ha, rt/+openbsd/syscallno.ha, and rt/configure. The build used QBE as the backend. Initial compile problems included a mktemp usage that did not match mktemp(3), which was resolved by renaming occurrences (emktemp), and multiple printf format-string warnings that failed the build because -Werror was enabled; clang’s diagnostics guided the fixes for format specifiers that differ between OpenBSD and other Unixes.
All tests initially failed until platform-specific ELF and linking issues were addressed: OpenBSD requires a .note.openbsd.ident section in binaries, so the assembly for _start was modified and the linker script was taught to preserve that section. Tests still failed until GDB (starti) revealed that the program was being built PIE, so adding -nopie stabilized the first-instruction address. After those fixes the test suite passed. A patch with these changes was submitted to the mailing list (some format-string changes may need upstream adjustment). Next steps include porting the runtime/standard library and adding riscv64 and arm64 support.
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