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-rw-r--r--Tests/RunCMake/CXXModules/NoScanningVariable.cmake21
-rw-r--r--Tests/RunCMake/CXXModules/RunCMakeTest.cmake1
-rw-r--r--Tests/RunCMake/CXXModules/main-no-use.cxx4
3 files changed, 26 insertions, 0 deletions
diff --git a/Tests/RunCMake/CXXModules/NoScanningVariable.cmake b/Tests/RunCMake/CXXModules/NoScanningVariable.cmake
new file mode 100644
index 0000000..4bb6a70
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/NoScanningVariable.cmake
@@ -0,0 +1,21 @@
+# Enable scanning by default for targets that explicitly use C++ 20.
+cmake_policy(SET CMP0155 NEW)
+
+enable_language(CXX)
+
+# Hide any real scanning rule that may be available.
+unset(CMAKE_CXX_SCANDEP_SOURCE)
+
+# Explicitly enable C++20 for all targets.
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Explicitly suppress scanning so that support is not required.
+set(CMAKE_CXX_SCAN_FOR_MODULES OFF)
+
+add_executable(noscanning-variable main-no-use.cxx)
+
+# Verify that CMAKE_CXX_SCAN_FOR_MODULES is propagated into the check.
+# FIXME: Unset CMAKE_CXX_SCANDEP_SOURCE inside try_compile so this
+# test can verify behavior on newer compilers too.
+try_compile(result SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/main-no-use.cxx)
diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index 05d2655..e13b2d4 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -20,6 +20,7 @@ if ("cxx_std_20" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
run_cmake(NoScanningSourceFileProperty)
run_cmake(NoScanningTargetProperty)
+ run_cmake(NoScanningVariable)
run_cmake(CMP0155-OLD)
run_cmake(CMP0155-NEW)
endif ()
diff --git a/Tests/RunCMake/CXXModules/main-no-use.cxx b/Tests/RunCMake/CXXModules/main-no-use.cxx
new file mode 100644
index 0000000..f8b643a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/main-no-use.cxx
@@ -0,0 +1,4 @@
+int main()
+{
+ return 0;
+}