CMake: pro2cmake.py: Make \$\$QT_FOO work in assignments

This broke somewhere along the way. Add a test for this.

Change-Id: I106ddff6eb86a51ef132285d1bc623f3b5cf71fb
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

util/cmake/pro2cmake.py

@@ -544,7 +544,7 @@ class QmakeParser:
         SubstitutionValue \
             = pp.Combine(pp.OneOrMore(Substitution | LiteralValuePart
                                       | pp.Literal('$')))
-        Value = pp.NotAny(Else | pp.Literal('}') | EOL | pp.Literal('\\')) \
+        Value = pp.NotAny(Else | pp.Literal('}') | EOL) \
             + (pp.QuotedString(quoteChar='"', escChar='\\')
                 | SubstitutionValue
                 | BracedValue)

util/cmake/tests/data/escaped_value.pro

@@ -0,0 +1,2 @@
+MODULE_AUX_INCLUDES = \
+    \$\$QT_MODULE_INCLUDE_BASE/QtANGLE

util/cmake/tests/test_parsing.py

@@ -287,3 +287,10 @@ def test_realworld_sql():
     assert len(result) == 2
     validate_op('TEMPLATE', '=', ['subdirs'], result[0])
     validate_op('SUBDIRS', '=', ['kernel'], result[1])
+
+
+def test_realworld_qtconfig():
+    result = parse_file(_tests_path + '/data/escaped_value.pro')
+    assert len(result) == 1
+    validate_op('MODULE_AUX_INCLUDES', '=', ['\\$\\$QT_MODULE_INCLUDE_BASE/QtANGLE'], result[0])
+