INSTALL: build mk all the time If mk gets into a bad state, it's not obvious that you can remove the binary to force the rebuild. Also, not rebuilding means that bugs in mkmk.sh are not noticed. Just rebuild from scratch every time. It doesn't take too long compared to the rest of INSTALL.

9c, 9l: accept CC9FLAGS from config Also, if CC9FLAGS includes -fsanitize=address (ASAN), predefine PLAN9PORT_ASAN for use by programs that need to know (mainly libthread). The 9c script used to have a variable called ngflags, which was ccflags except -g (ng stood for "no g"), but nothing needs it split out anymore, so simplify to just ccflags.

mk: replace overlapping strcpy with memmove Found by ASAN.

lib9: use opendir/readdir to read directories getdirentries(2) has been deprecated on macOS since 10.5 (ten releases ago). Using it requires disabling 64-bit inodes, but that in turn makes binaries incompatible with some dynamic libraries, most notably ASAN. At some point getdirentries(2) will actually be removed. For both these reasons, switch to opendir/readdir. A little clunky since we have to keep the DIR* hidden away to preserve the int fd interfaces, but it lets us remove a bunch of OS-specific code too.

lib9: move seek into open.c More preparation for opendir.

lib9: add close More preparation for opendir.

lib9: merge create, open, dirread into open.c Preparation for using opendir.

fmt: adjust GCC version check atomics were added in GCC 4.9: https://gcc.gnu.org/gcc-4.9/changes.html

all: fix #includes for AIX, add a few AIX "implementation" files

mk: support Big Archive Format under AIX

all: update build scripts to fix AIX XL/C compatibility

fmt: disable use of stdatomic on AIX XL C and old GCC C11 is apparently too new for these systems. Fixes #55.

9term.app: respect user-set shell instead of forcing bash

rc(1): mention /etc/shells in BUGS section

rc: clean up parser levels, disallow free carats on lists