message: Makefile.rules: Degrade gracefully on Windows machines without sed.
diff: @@ -253,14 +253,11 @@ ifeq "$(MAKE_DWO)" "YES"
  endif
  # Use a shared module cache when building in the default test build directory.
  -ifeq "$(findstring lldb-test-build.noindex, $(BUILDDIR))" ""
  -CLANG_MODULE_CACHE_DIR := $(BUILDDIR)/module-cache
  -else
  CLANG_MODULE_CACHE_DIR := $(shell echo "$(BUILDDIR)" | sed 's/lldb-test-build.noindex.*/lldb-test-build.noindex\/module-cache-clang/')
  -endif
  -ifeq "$(CLANG_MODULE_CACHE_DIR)" ""
  -$(error failed to set the shared clang module cache dir)
  +ifeq "$(findstring lldb-test-build.noindex, $(BUILDDIR))" ""
  +CLANG_MODULE_CACHE_DIR := $(BUILDDIR)/module-cache
  +$(warning failed to set the shared clang module cache dir)
  endif
  MANDATORY_MODULE_BUILD_CFLAGS := -fmodules -gmodules -fmodules-cache-path=$(CLANG_MODULE_CACHE_DIR)
  