6 * Page 13 (page 19 of the PDF) of the GLSL 1.10 spec says:
8 * "Macro expansion is not done on lines containing #extension and #version
11 * Therefore, FOO will not be replaced by a valid behavior token.
16 /* Some compilers generate spurious errors if a shader does not contain
17 * any code or declarations.
19 int foo(void) { return 1; }