Keep /external:I... on a single param file line

fmeum · copybara-github · commit 759fe7d7f3fd · 2024-06-04T00:55:40.000-07:00
MSVC fails if `/external:I <some_path>` is broken into two lines in `.param` files. This is avoided by using the alternative `/external:I<some_path>` form. Fixes #22614 Closes #22616. PiperOrigin-RevId: 640055579 Change-Id: I5fda2714dc479fd76f22e2f8562dddbdfcdb9a18
diff --git a/tools/cpp/windows_cc_toolchain_config.bzl b/tools/cpp/windows_cc_toolchain_config.bzl
@@ -906,7 +906,7 @@ def _impl(ctx):
                     ],
                     flag_groups = [
                         flag_group(
-                            flags = ["/external:I", "%{external_include_paths}"],
+                            flags = ["/external:I%{external_include_paths}"],
                             iterate_over = "external_include_paths",
                             expand_if_available = "external_include_paths",
                         ),
