Import bmake-20200902vendor/NetBSD/bmake/20200902

Lots of code refactoring, simplification and cleanup.
Lots of new unit-tests providing much higher code coverage.
All courtesy of rillig at netbsd.

Other significant changes:

o new read-only variable .SHELL which provides the path of the shell
  used to run scripts (as defined by  the .SHELL target).

o new debug option -dl: LINT mode, does the equivalent of := for all
  variable assignments so that file and line number are reported for
  variable parse errors.

1 files changed, 19 insertions, 1 deletions

diff --git a/unit-tests/cond-short.mk b/unit-tests/cond-short.mk
index 41d76768a404..ae441d80f7d9 100644
--- a/unit-tests/cond-short.mk
+++ b/unit-tests/cond-short.mk
@@ -1,4 +1,4 @@
-# $NetBSD: cond-short.mk,v 1.7 2020/07/09 22:34:09 sjg Exp $
+# $NetBSD: cond-short.mk,v 1.9 2020/08/19 22:47:09 rillig Exp $
 #
 # Demonstrates that in conditions, the right-hand side of an && or ||
 # is only evaluated if it can actually influence the result.
@@ -66,6 +66,19 @@ VAR=	# empty again, for the following tests
 .if 0 && !empty(:U${:!echo "unexpected exclam modifier" 1>&2 !})
 .endif
 
+# Irrelevant assignment modifiers are skipped as well.
+.if 0 && ${1 2 3:L:@i@${FIRST::?=$i}@}
+.endif
+.if 0 && ${1 2 3:L:@i@${LAST::=$i}@}
+.endif
+.if 0 && ${1 2 3:L:@i@${APPENDED::+=$i}@}
+.endif
+.if 0 && ${echo.1 echo.2 echo.3:L:@i@${RAN::!=${i:C,.*,&; & 1>\&2,:S,., ,g}}@}
+.endif
+.if defined(FIRST) || defined(LAST) || defined(APPENDED) || defined(RAN)
+.warning first=${FIRST} last=${LAST} appended=${APPENDED} ran=${RAN}
+.endif
+
 # The || operator.
 
 .if 1 || ${echo "unexpected or" 1>&2 :L:sh}
@@ -110,6 +123,7 @@ x=Ok
 x=Fail
 .endif
 x!= echo 'defined(V42) && ${V42} > 0: $x' >&2; echo
+
 # this one throws both String comparison operator and
 # Malformed conditional with cond.c 1.78
 # indirect iV2 would expand to "" and treated as 0
@@ -119,6 +133,7 @@ x=Fail
 x=Ok
 .endif
 x!= echo 'defined(V66) && ( "${iV2}" < ${V42} ): $x' >&2; echo
+
 # next two thow String comparison operator with cond.c 1.78
 # indirect iV1 would expand to 42
 .if 1 || ${iV1} < ${V42}
@@ -127,12 +142,14 @@ x=Ok
 x=Fail
 .endif
 x!= echo '1 || ${iV1} < ${V42}: $x' >&2; echo
+
 .if 1 || ${iV2:U2} < ${V42}
 x=Ok
 .else
 x=Fail
 .endif
 x!= echo '1 || ${iV2:U2} < ${V42}: $x' >&2; echo
+
 # the same expressions are fine when the lhs is expanded
 # ${iV1} expands to 42
 .if 0 || ${iV1} <= ${V42}
@@ -141,6 +158,7 @@ x=Ok
 x=Fail
 .endif
 x!= echo '0 || ${iV1} <= ${V42}: $x' >&2; echo
+
 # ${iV2:U2} expands to 2
 .if 0 || ${iV2:U2} < ${V42}
 x=Ok