- Fix markup typo in the man page.
- Abort on line numbering or column numbering overflow. Line numbers are limited
to values that fit in "unsigned int". Also reject input lines longer than
2^32-1 characters. It seems reasonable to presume that any input that violates
these constraints is someone screwing around and not a serious attempt to
compile or preprocess anything useful. Done in response to n2129, but without
getting into any of the silliness found there.
- Recognize __ia64__ for IA64 builds.
- Recognize __aarch64__ for 64-bit ARM builds, as sent in by various people.
- Recognize __riscv__ and __riscv64__ for risc-v builds.
948f01caa7