linker: Reject shaders that have unresolved function calls

This really amounts to just using the return value from
link_function_calls.  All the work was being done, but the result was
being ignored.

Fixes piglit test link-unresolved-funciton.

NOTE: this is a candidate for the 7.9 branch.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 2cbfd78ba0..db1b76b371 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -793,7 +793,7 @@ link_intrastage_shaders(struct gl_context *ctx,
       return NULL;
    }
 
-   gl_shader *const linked = ctx->Driver.NewShader(NULL, 0, main->Type);
+   gl_shader *linked = ctx->Driver.NewShader(NULL, 0, main->Type);
    linked->ir = new(linked) exec_list;
    clone_ir_list(linked, linked->ir, main->ir);
 
@@ -840,7 +840,11 @@ link_intrastage_shaders(struct gl_context *ctx,
 
    assert(idx == num_linking_shaders);
 
-   link_function_calls(prog, linked, linking_shaders, num_linking_shaders);
+   if (!link_function_calls(prog, linked, linking_shaders,
+			    num_linking_shaders)) {
+      ctx->Driver.DeleteShader(ctx, linked);
+      linked = NULL;
+   }
 
    free(linking_shaders);