bisected to:
be8aa76afd2cc5326c9d9d59c591e06365c5f618
Author:     Samuel Pitoiset <samuel.pitoiset@gmail.com>

glsl: remove unecessary flags.q.subroutine_def

This bit is definitely not necessary because subroutine_list
can be used instead. This frees one more bit in the flags.q
struct which is nice because arb_bindless_texture will need
4 bits for the new layout qualifiers.

No piglit regressions found (including compiler tests) with
"-t subroutine".

v2: set the subroutine flag for validating illegal flags

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>


Standard Output:

/tmp/build_root/m64/lib/piglit/bin/glslparsertest /tmp/build_root/m64/lib/piglit/tests/spec/arb_shader_subroutine/compiler/direct-call.vert pass 1.50 GL_ARB_shader_subroutine
piglit: debug: Requested an OpenGL 3.2 Core Context, and received a matching 4.5 context

Shader source:
// [config]
// expect_result: pass
// glsl_version: 1.50
// require_extensions: GL_ARB_shader_subroutine
// [end config]

#version 150
#extension GL_ARB_shader_subroutine: require

/* The ARB_shader_subroutine spec says nothing to
 * explicitly disallow calling subroutine implementations
 * as normal functions.
 *
 * It seems reasonable that this would still work.
 */

subroutine void func_type();

/* A subroutine matching the above type */
subroutine (func_type) void impl() {}

/* Call the function directly, rather than via
 * a subroutine uniform.
 */
void foo() {
	impl();
}

Standard Error

Failed to compile vertex shader /tmp/build_root/m64/lib/piglit/tests/spec/arb_shader_subroutine/compiler/direct-call.vert: 0:26(2): error: subroutine name cannot be a constructor `impl'