glsl: Silence unused variable warning in the release build

Resolves the following gcc warning

 opt_flip_matrices.cpp:84:32: warning: unused variable 'deref'

v2: keep the variable, but wrap it in a ifndef NDEBUG block
    (suggested by Ian)

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/glsl/opt_flip_matrices.cpp b/src/glsl/opt_flip_matrices.cpp
index 497513fe82e4e01ecc2aa4850059f83fbf8bf522..2107b1d47406e518f166bba1aa05c2069c4d845c 100644 (file)
--- a/src/glsl/opt_flip_matrices.cpp
+++ b/src/glsl/opt_flip_matrices.cpp
@@ -81,8 +81,10 @@ matrix_flipper::visit_enter(ir_expression *ir)
 
    if (mvp_transpose &&
        strcmp(mat_var->name, "gl_ModelViewProjectionMatrix") == 0) {
+#ifndef NDEBUG
       ir_dereference_variable *deref = ir->operands[0]->as_dereference_variable();
       assert(deref && deref->var == mat_var);
+#endif
 
       void *mem_ctx = ralloc_parent(ir);