The check was in the wrong place, such that if a shader incorrectly put
a preprocessor token before the #version declaration, the version would
be resolved twice, leading to a segmentation fault when attempting to
redefine the __VERSION__ macro.

 #define GL_ARB_sample_shading
 #version 130
 void main() {}
---
 src/glsl/glcpp/glcpp-parse.y | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index 184e5c2..3737001 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -2024,6 +2024,9 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t 
*parser, intmax_t versio
 {
        const struct gl_extensions *extensions = parser->extensions;
 
+       if (parser->version_resolved)
+               return;
+
        parser->version_resolved = true;
 
        add_builtin_define (parser, "__VERSION__", version);
@@ -2146,9 +2149,6 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t 
*parser, intmax_t versio
 void
 glcpp_parser_resolve_version(glcpp_parser_t *parser)
 {
-       if (parser->version_resolved)
-               return;
-
        _glcpp_parser_handle_version_declaration(parser, IMPLICIT_GLSL_VERSION,
                                                 NULL, false);
 }
-- 
1.8.3.2

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