[clang] [ClangScanDeps] Avoid use-of-uninitialized-memory for end-of-directive edge case (PR #188590)

[via cfe-commits]

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+// Test that there is no use-of-uninitialized memory when parsing '#include' in
+// the last line, without a newline.
+//
+// Forked from p1689-suppress-warnings.cppm.
+
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+// RUN: split-file %s %t
+
+// Test P1689 format - should NOT emit warnings
+// RUN: clang-scan-deps -format=p1689 -- %clang++ -std=c++20 -I%t -c %t/mylib.cppm -o %t/mylib.o 2>&1 | FileCheck %s
+
+// CHECK-NOT: warning:
+// CHECK: {
+// CHECK: "revision"
+
+//--- header.h
+// Empty header for testing
+
+//--- mylib.cppm
+module;
+
+export module mylib;
+
+#include <header.h>
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yronglin wrote:

Thanks! Got it.

https://github.com/llvm/llvm-project/pull/188590