TMP: Debug diff

go/private/context.bzl

@@ -501,21 +501,26 @@ def go_context(
         stdlib = go_context_data[GoStdLib]
         go_context_info = go_context_data[GoContextInfo]
 
-    if goos == "auto" and goarch == "auto" and cgo_context_info:
-        # Fast-path to reuse the GoConfigInfo as-is
-        mode = go_config_info
-    else:
-        if go_config_info == None:
-            go_config_info = default_go_config_info
-        mode_kwargs = structs.to_dict(go_config_info)
-        mode_kwargs["goos"] = toolchain.default_goos if goos == "auto" else goos
-        mode_kwargs["goarch"] = toolchain.default_goarch if goarch == "auto" else goarch
-        if not cgo_context_info:
-            if getattr(ctx.attr, "pure", None) == "off":
-                fail("{} has pure explicitly set to off, but no C++ toolchain could be found for its platform".format(ctx.label))
-            mode_kwargs["pure"] = True
-        mode = GoConfigInfo(**mode_kwargs)
-        validate_mode(mode)
+    # Fast-path to reuse the GoConfigInfo as-is
+    first_mode = go_config_info
+
+    #    else:
+    if go_config_info == None:
+        go_config_info = default_go_config_info
+    mode_kwargs = structs.to_dict(go_config_info)
+    mode_kwargs["goos"] = toolchain.default_goos if goos == "auto" else goos
+    mode_kwargs["goarch"] = toolchain.default_goarch if goarch == "auto" else goarch
+    if not cgo_context_info:
+        if getattr(ctx.attr, "pure", None) == "off":
+            fail("{} has pure explicitly set to off, but no C++ toolchain could be found for its platform".format(ctx.label))
+        mode_kwargs["pure"] = True
+    second_mode = GoConfigInfo(**mode_kwargs)
+    validate_mode(second_mode)
+
+    if goos == "auto" and goarch == "auto" and cgo_context_info and go_config_info:
+        if first_mode != second_mode:
+            fail("Inconsistent GoConfigInfo: {} != {}".format(first_mode, second_mode))
+    mode = second_mode
 
     if stdlib:
         goroot = stdlib.root_file.dirname