Update to 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 variable parsing detects more errors.

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, 0 deletions

diff --git a/contrib/bmake/unit-tests/dir-expand-path.mk b/contrib/bmake/unit-tests/dir-expand-path.mk
new file mode 100755
index 000000000000..1ce349cce385
--- /dev/null
+++ b/contrib/bmake/unit-tests/dir-expand-path.mk
@@ -0,0 +1,19 @@
+# $NetBSD: dir-expand-path.mk,v 1.1 2020/08/22 21:55:54 rillig Exp $
+#
+# Tests for filename expansion in the search path.
+
+_!=	rm -rf dir-expand-path.dir.*
+_!=	mkdir dir-expand-path.dir.1
+_!=	mkdir dir-expand-path.dir.2
+_!=	touch dir-expand-path.dir.1/file1.src
+_!=	touch dir-expand-path.dir.1/file2.src
+_!=	touch dir-expand-path.dir.2/file3.src
+
+.PATH: dir-expand-path.dir.1
+.PATH: dir-expand-path.dir.2
+
+all: *.src
+	@printf '%s\n' ${.ALLSRC:O}
+
+.END:
+	@rm -rf dir-expand-path.dir.*