all: fix or silence various gcc warnings As usual, gcc finds some real problems but also reports a ton of noise. Fix the problems and quiet the noise.

9c: Fix case patterns for DragonFly and other BSDs POSIX does not support grouping in case item patterns. Installing with a strict POSIX shell fails with: /usr/local/plan9/bin/9c: line 82: syntax error near unexpected token `(' /usr/local/plan9/bin/9c: line 82: `*(DragonFly|BSD)*gcc*) usegcc ;;' This change expands the patterns to work around the limitation. See https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10 (and search for case_clause)

INSTALL, 9c, 9l: improve handling of *BSD (#302)

9c, 9l: use $TMPDIR if available (#272) NixOS sandboxed builds (at least on Mac) don't have access to /tmp, and this should be better POSIX.

all: fix or silence all INSTALL warnings on macOS Should be a clean build now. Change-Id: Id3460371cb5e8d4071f8faa9c2aec870d213a067 Reviewed-on: https://plan9port-review.googlesource.com/2781 Reviewed-by: Russ Cox <rsc@swtch.com>

fix clang 3.4 warnings and ignore uninteresting ones fixed warnings: src/cmd/fossil/disk.c:37:14: warning: use of GNU 'missing =' extension in designator [-Wgnu-designator] src/cmd/fossil/disk.c:38:14: warning: use of GNU 'missing =' extension in designator [-Wgnu-designator] src/cmd/fossil/disk.c:39:14: warning: use of GNU 'missing =' extension in designator [-Wgnu-designator] src/cmd/fossil/disk.c:40:13: warning: use of GNU 'missing =' extension in designator [-Wgnu-designator] src/cmd/fossil/disk.c:41:14: warning: use of GNU 'missing =' extension in designator [-Wgnu-designator] src/libndb/ndbreorder.c:41:55: warning: for loop has empty body [-Wempty-body] ignored warnings: src/cmd/acid/dbg.y:393:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/bc.y:1327:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/bc.y:1327:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/grep/grep.y:420:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/grep/grep.y:420:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/hoc/hoc.y:692:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/hoc/hoc.y:692:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/lex/parser.y:886:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/rc/syn.y:303:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/cmd/units.y:1003:9: warning: array index -1 is before the beginning of the array [-Warray-bounds] src/libregexp/regcomp.c:19:16: warning: variable 'reprog' is not needed and will not be emitted [-Wunneeded-internal-declaration] LGTM=rsc R=rsc https://codereview.appspot.com/158250043

all: DragonFly port. Fix compilation problems, libdraw still doesn't work right yet. LGTM=rsc R=rsc https://codereview.appspot.com/67820046

9c: support clang on Mac R=rsc http://codereview.appspot.com/6744055

9c: add more clang warning silencers, use signed chars R=rsc http://codereview.appspot.com/6741053

build: OS X 64-bit build R=rsc http://codereview.appspot.com/4838047

SunOS fixes (thanks Aram Hăvărneanu) R=rsc, rsc http://codereview.appspot.com/4271084

9c, 9l: allow CC9=clang R=rsc CC=codebot http://codereview.appspot.com/217045

INSTALL: fix build on Snow Leopard http://codereview.appspot.com/116073

merge

9c: another gcc, another useless warning