glcpp: Add tests for line continuation

First we test that line continuations are honored within a comment, (as
recently changed in glcpp), then we test that line continuations can be
disabled via an option within the context. This is tested via the new support
for a test-specific command-line option passed to glcpp.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/glcpp/tests/115-line-continuations.c

@@ -0,0 +1,9 @@
+// This comment continues to the next line, hiding the define \
+#define CONTINUATION_UNSUPPORTED
+
+#ifdef CONTINUATION_UNSUPPORTED
+failure
+#else
+success
+#endif
+

src/glsl/glcpp/tests/115-line-continuations.c.expected

@@ -0,0 +1,10 @@
+
+
+
+
+
+
+success
+
+
+

src/glsl/glcpp/tests/116-disable-line-continuations.c

@@ -0,0 +1,13 @@
+// glcpp-args: --disable-line-continuations
+
+// This comments ends with a backslash \\
+#define NO_CONTINUATION
+
+#ifdef NO_CONTINUATION
+success
+#else
+failure
+#endif
+
+
+

src/glsl/glcpp/tests/116-disable-line-continuations.c.expected

@@ -0,0 +1,14 @@
+
+
+
+
+
+
+success
+
+
+
+
+
+
+