[maarten-boot]

em22's assembler (util/ass) has its own allocator in asscm.c.
getarea() rounds sizes to sizeof(int) and splits free blocks from
the end, so after a name (strlen + 1 bytes) the next area lands at 4
(mod 8). The structs kept there (line_t, relc_t, locl_t,
stat_t, and the allocator's own freeblock) hold pointers, so they
are misaligned on a 64-bit host. Built with -fsanitize=alignment,
em_ass reports 919 misaligned accesses while linking the seven em22
examples.

This rounds all sizes to _Alignof(max_align_t) (and to at least the
size of a free block's header), as led does since #385, and aligns the
workspace in main() that is given to the allocator at start.

Tested: all platforms, 226 tests pass. With -fsanitize=alignment:
919 reports before, 0 after (and 919 again with the change reverted).
The seven em22 programs are byte-for-byte identical with and without
the change.

🤖 Generated with Claude Code

[davidgiven]

Merging, thanks (although I think I'll just rip out the custom allocator here; they're usually a terrible idea).