Revert "glsl: Refuse to link GLSL 1.40+ shaders that would use fixed function."

This reverts commit 4ec449a6ed1d2cea3bf83d6518b3b352ce5daceb.

I meant to not push this one.  Review found that a link error is not
mandated: it should link, but you get undefined rendering if you rely
on a missing stage.

     page 42/55 section 2.11 "Vertex Shaders":

     "If the program object has no vertex shader, or no program object
      is currently in use, the results of vertex shader execution are
      undefined."

(and similar for page 160/173 section 3.9 "Fragment Shaders" for FS,
and page 45/58 section 2.11.2 "Program Objects" for program being 0)

It turns out the commit was broken anyway, because it was missing a
"goto done", so linkstatus got smashed back to true later and the
error just showed up as a warning in the infolog.

1 files changed, 0 insertions, 14 deletions

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 5f8e8830169..6ba297237c7 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -2225,20 +2225,6 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
       goto done;
    }
 
-   if (max_version >= 140) {
-      /* Note that this will change with GL_ARB_separate_shader_objects */
-      if (num_vert_shaders == 0) {
-	 linker_error(prog,
-		      "GLSL %.02f without GL_ARB_compatibility requires a "
-		      "vertex shader", max_version / 100.0);
-      }
-      if (num_frag_shaders == 0) {
-	 linker_error(prog,
-		      "GLSL %.02f without GL_ARB_compatibility requires a "
-		      "fragment shader", max_version / 100.0);
-      }
-   }
-
    prog->Version = max_version;
 
    for (unsigned int i = 0; i < MESA_SHADER_TYPES; i++) {