From 0b333de923f8e9d3d8a0916a351840ccf81f4d37 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Tue, 8 Nov 2022 17:00:37 -0500
Subject: ci: add C++ module rules file for Clang

---
 .gitlab/ci/cxx_modules_rules_clang.cmake | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 .gitlab/ci/cxx_modules_rules_clang.cmake

diff --git a/.gitlab/ci/cxx_modules_rules_clang.cmake b/.gitlab/ci/cxx_modules_rules_clang.cmake
new file mode 100644
index 0000000..9d75880
--- /dev/null
+++ b/.gitlab/ci/cxx_modules_rules_clang.cmake
@@ -0,0 +1,16 @@
+set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")
+
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)
+string(CONCAT CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE
+  "${CMAKE_CXX_COMPILER_CLANG_SCAN_DEPS}"
+  " -format=p1689 --p1689-targeted-file-name=<SOURCE> --p1689-targeted-output=<OBJECT> --"
+  " <DEFINES> <INCLUDES> <FLAGS> -x c++ <SOURCE>"
+  " > <DYNDEP_FILE>")
+# No support for `-MF` discovered dependencies in `clang-scan-deps`.
+set(CMAKE_EXPERIMENTAL_CXX_SCANDEP_DEPFILE_FORMAT "none")
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FORMAT "clang")
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG "@<MODULE_MAP_FILE>")
+
+# Default to C++ extensions being off. Clang's modules support have trouble
+# with extensions right now.
+set(CMAKE_CXX_EXTENSIONS OFF)
-- 
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