File grub2-fix-build-with-flex-2.6.4.patch of Package grub2

From: Andrei Borzenkov <>

Fix build with flex 2.6.4+. It no more casts fprintf() call to void, resulting in

[  108s] grub_script.yy.c: In function 'yy_fatal_error':
[  108s] grub_script.yy.c:18:22: error: statement with no effect [-Werror=unused-value]
[  108s]  

as grub2 defines fprintf as 0. Change it to explicitly define fprintf as (void)0.

flex commit:
Index: grub-2.02/grub-core/script/yylex.l
--- grub-2.02.orig/grub-core/script/yylex.l
+++ grub-2.02/grub-core/script/yylex.l
@@ -91,7 +91,7 @@ typedef size_t yy_size_t;
 #define stdin  0
 #define stdout 0
-#define fprintf(...) 0
+#define fprintf(...) (void)0
 #define exit(...) grub_fatal("fatal error in lexer")
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