make: fix detection of target rules

The presence of an equal sign in an inline command on a target
rule caused the line to be detected as a macro assignment.

For example:

   target:; @echo a = $(a)

Rearrange input parsing so target rules are detected before macro
assignments.  This is made more complex by having to allow for the
':=', '::=' and ':::=' assignment operators.  (And for targets
containing colons on Windows.)

Costs 240-248 bytes.

1 files changed, 8 insertions, 0 deletions

diff --git a/testsuite/make.tests b/testsuite/make.tests
index 60bb78406..3c2aa5cf5 100755
--- a/testsuite/make.tests
+++ b/testsuite/make.tests
@@ -94,6 +94,14 @@ target:
         @exit 42
 '
 
+# An equal sign in a command on a target rule was detected as a
+# macro assignment.
+testing "make equal sign in inline command" \
+        "make -f -" "a = a\n" "" '
+a = a
+target:;@echo a = $(a)
+'
+
 # A macro created using ::= remembers it's of type immediate-expansion.
 # Immediate expansion also occurs when += is used to append to such a macro.
 testing "make appending to immediate-expansion macro" \