Prefer PATH_MAX to MAXPATHLEN
PATH_MAX is standardized, MAXPATHLEN is not. Also, the Gnulib pathmax module fixes some rare bugs with PATH_MAX. So prefer PATH_MAX to MAXPATHLEN unless we know the latter is also correct (for some platform-specific code). * admin/merge-gnulib (GNULIB_MODULES): Add pathmax. This module was already present, as a dependency of canonicalize-lgpl, but now Emacs is using it directly. Sort. * lib-src/emacsclient.c: Include stdint.h, pathmax.h. (get_current_dir_name): Sync to current src/sysdep.c. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate. * src/sysdep.c: Include pathmax.h. (get_current_dir_name_or_unreachable): Use PATH_MAX instead of MAXPATHLEN.
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