On 2024-07-29 06:36, Zack Weinberg wrote:
However, perhaps we could have a new family of
AC_FUNC_MMAP_* macros that check for specific subsets of mmap functionality
that are generally useful
That could be trouble for cross-compiles, no?
For cross-compiles AC_FUNC_MMAP currently guesses that mmap works on
Linux kernels and fails everywhere else. This is obviously wrong but I
guess good enough for programs that use AC_FUNC_MMAP. Not sure I'd like
to maintain guesses for a more-sophisticated set of mmap configuration
macros.
Anyway, if you want to head in this direction I suggest talking to Bruno
Haible for advice and looking at Gnulib for prior art, e.g.,
gl_FUNC_MMAP_ANON sounds like it's the sort of macro that Yury was
asking for. A nice property of gl_FUNC_MMAP_ANON is that it doesn't do
runtime checks. (Don't know why it's so complicated, though; you'd have
to ask Bruno about that.)
