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-rw-r--r--src/glsl/glcpp/glcpp-parse.y6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index ccf8105597b..9d8b5bbb0b6 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -260,6 +260,12 @@ control_line:
| HASH_UNDEF {
glcpp_parser_resolve_implicit_version(parser);
} IDENTIFIER NEWLINE {
+ if (strcmp("__LINE__", $3) == 0
+ || strcmp("__FILE__", $3) == 0
+ || strcmp("__VERSION__", $3) == 0)
+ glcpp_error(& @1, parser, "Built-in (pre-defined)"
+ " macro names can not be undefined.");
+
macro_t *macro = hash_table_find (parser->defines, $3);
if (macro) {
hash_table_remove (parser->defines, $3);