This is to avoid the default, silent flex rule which simply prints the
character to stdout.
---
src/glsl/glsl_lexer.ll | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/glsl/glsl_lexer.ll b/src/glsl/glsl_lexer.ll
index db7b1d1..1cadf1f 100644
--- a/src/glsl/glsl_lexer.ll
+++ b/src/glsl/glsl_lexer.ll
@@ -153,6 +153,9 @@ literal_integer(char *text, int len, struct
_mesa_glsl_parse_state *state,
%option prefix="_mesa_glsl_lexer_"
%option extra-type="struct _mesa_glsl_parse_state *"
+ /* Note: When adding any start conditions to this list, you must also
+ * update the "Internal compiler error" catch-all rule near the end of
+ * this file. */
%x PP PRAGMA
DEC_INT [1-9][0-9]*
@@ -555,6 +558,16 @@ subroutine KEYWORD(0, 300, 0, 0, SUBROUTINE);
. { return yytext[0]; }
+ /* This is a catch-all to avoid the annoying default flex action which
+ * matches any character and prints it. If any input ever matches this
+ * rule, then we have made a mistake above and need to fix one or more
+ * of the preceding patterns to match that input. */
+<PP,PRAGMA>. {
+ _mesa_glsl_error(yylloc, yyextra,
+ "Internal compiler error: Unexpected character: %s",
yytext);
+}
+
+
%%
int
--
2.0.0
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