From fb34bafd37e3509d51686ee2a5392d2d8e29d7c5 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 10 Oct 2025 17:31:01 -0700
Subject: Add diagnostic for cyclic #include. (#8679)

---
 tests/preprocessor/circular-include/a.slang  |  7 +++++++
 tests/preprocessor/circular-include/b.slang  |  1 +
 tests/preprocessor/duplicate-include/a.slang | 13 +++++++++++++
 tests/preprocessor/duplicate-include/b.slang |  3 +++
 4 files changed, 24 insertions(+)
 create mode 100644 tests/preprocessor/circular-include/a.slang
 create mode 100644 tests/preprocessor/circular-include/b.slang
 create mode 100644 tests/preprocessor/duplicate-include/a.slang
 create mode 100644 tests/preprocessor/duplicate-include/b.slang

(limited to 'tests/preprocessor')

diff --git a/tests/preprocessor/circular-include/a.slang b/tests/preprocessor/circular-include/a.slang
new file mode 100644
index 000000000..fe519dd12
--- /dev/null
+++ b/tests/preprocessor/circular-include/a.slang
@@ -0,0 +1,7 @@
+//TEST:SIMPLE(filecheck=CHECK): -target spirv
+
+// Test that we can diagnose an error when there is a circular include.
+
+// CHECK: error 15302: cyclic `#include` of file
+
+#include "b.slang"
\ No newline at end of file
diff --git a/tests/preprocessor/circular-include/b.slang b/tests/preprocessor/circular-include/b.slang
new file mode 100644
index 000000000..1f259de9a
--- /dev/null
+++ b/tests/preprocessor/circular-include/b.slang
@@ -0,0 +1 @@
+#include "a.slang"
\ No newline at end of file
diff --git a/tests/preprocessor/duplicate-include/a.slang b/tests/preprocessor/duplicate-include/a.slang
new file mode 100644
index 000000000..ce2c22b61
--- /dev/null
+++ b/tests/preprocessor/duplicate-include/a.slang
@@ -0,0 +1,13 @@
+//TEST:INTERPRET(filecheck=CHECK):
+
+// Test that it is OK to include the same file multiple times.
+
+#include "b.slang"
+
+#include "b.slang"
+
+void main()
+{
+    // CHECK: result: 23
+    printf("result: %d\n", foo());
+}
diff --git a/tests/preprocessor/duplicate-include/b.slang b/tests/preprocessor/duplicate-include/b.slang
new file mode 100644
index 000000000..c3769f038
--- /dev/null
+++ b/tests/preprocessor/duplicate-include/b.slang
@@ -0,0 +1,3 @@
+#pragma once
+
+int foo() { return 23; }
\ No newline at end of file
-- 
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