[ClangScanDeps] Do not emit warning for P1689 format#186966
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ChuanqiXu9 merged 1 commit intollvm:mainfrom Mar 24, 2026
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[ClangScanDeps] Do not emit warning for P1689 format#186966ChuanqiXu9 merged 1 commit intollvm:mainfrom
ChuanqiXu9 merged 1 commit intollvm:mainfrom
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Close llvm#185394 This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that.
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@llvm/pr-subscribers-clang Author: Chuanqi Xu (ChuanqiXu9) ChangesClose #185394 This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that. Full diff: https://github.com/llvm/llvm-project/pull/186966.diff 2 Files Affected:
diff --git a/clang/lib/DependencyScanning/DependencyScannerImpl.cpp b/clang/lib/DependencyScanning/DependencyScannerImpl.cpp
index d1aced2592be1..8c7eec6c7b326 100644
--- a/clang/lib/DependencyScanning/DependencyScannerImpl.cpp
+++ b/clang/lib/DependencyScanning/DependencyScannerImpl.cpp
@@ -412,6 +412,8 @@ void dependencies::initializeScanCompilerInstance(
ScanInstance.setBuildingModule(false);
ScanInstance.createVirtualFileSystem(FS, DiagConsumer);
ScanInstance.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
+ if (Service.getOpts().Format == ScanningOutputFormat::P1689)
+ ScanInstance.getDiagnostics().setIgnoreAllWarnings(true);
ScanInstance.createFileManager();
ScanInstance.createSourceManager();
diff --git a/clang/test/ClangScanDeps/p1689-suppress-warnings.cppm b/clang/test/ClangScanDeps/p1689-suppress-warnings.cppm
new file mode 100644
index 0000000000000..c012c520e5304
--- /dev/null
+++ b/clang/test/ClangScanDeps/p1689-suppress-warnings.cppm
@@ -0,0 +1,23 @@
+// Test that P1689 format suppresses warnings during dependency scanning.
+// This addresses https://github.com/llvm/llvm-project/issues/185394
+
+// 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>
\ No newline at end of file
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Given this is trivial and suggested by @Bigcheese . I'll land this next week if no more comments came in |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/164/builds/19951 Here is the relevant piece of the build log for the reference |
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This reverts commit caf6196.
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/94/builds/16379 Here is the relevant piece of the build log for the reference |
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Thanks for prepping #188179. I landed it because LLVM encourages revert first, ask questions later (https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy). Not confirmed yet, but I suspect the added test case (clang/test/ClangScanDeps/p1689-suppress-warnings.cppm) triggers a bug because it doesn’t contain a newline at the end of the file. (Arguably it is a bug in the pre-existing code, but in any case, it breaks the build.) |
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Update: I reproduced the buildbot failure using https://github.com/llvm/llvm-zorg/blob/main/zorg/buildbot/builders/sanitizers/buildbot_bootstrap_msan.sh and confirmed that adding a newline to clang/test/ClangScanDeps/p1689-suppress-warnings.cppm works around the test failure. |
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I believe so.
Thanks. Will do so. |
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…86966) Close llvm#185394 This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that.
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…e edge case llvm#186966 was reverted because the test case triggered a use-of-uninitialized-memory (https://lab.llvm.org/buildbot/#/builders/94/builds/16379), due to the include directive did not have a trailing newline. This patch adds a minor fix to avoid the use-of-uninitialized-memory, and deliberately re-adds the test case sans trailing newline for regression testing. MSan report prior to this fix: ``` @@@BUILD_STEP sanitizer logs: stage2/msan_track_origins check@@@ ==clang-scan-deps==616960==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5555599c3300 in isAnnotation /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:131:38 #1 0x5555599c3300 in setLength /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:152:13 llvm#2 0x5555599c3300 in clang::Lexer::FormTokenWithChars(clang::Token&, char const*, clang::tok::TokenKind) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Lexer.h:644:12 llvm#3 0x5555599cf895 in clang::Lexer::LexEndOfFile(clang::Token&, char const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Lexer.cpp:3166:5 llvm#4 0x555559bb229b in clang::Preprocessor::Lex(clang::Token&) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Preprocessor.cpp:916:11 llvm#5 0x555559aa5365 in __invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__type_traits/invoke.h:90:27 llvm#6 0x555559aa5365 in invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__functional/invoke.h:29:10 llvm#7 0x555559aa5365 in operator()<void (clang::Preprocessor::*)(clang::Token &)> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:470:5 llvm#8 0x555559aa5365 in clang::Preprocessor::CheckEndOfDirective(llvm::StringRef, bool, llvm::SmallVectorImpl<clang::Token>*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:478:5 llvm#9 0x555559ab96b5 in clang::Preprocessor::HandleIncludeDirective(clang::SourceLocation, clang::Token&, clang::detail::SearchDirIteratorImpl<true>, clang::FileEntry const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:2205:7 ```
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…86966) (llvm#188401) Close llvm#185394 This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that.
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…e edge case (#188590) #186966 was reverted because the test case triggered a use-of-uninitialized-memory (https://lab.llvm.org/buildbot/#/builders/94/builds/16379), due to the include directive omitting a trailing newline. This patch adds a minor fix to avoid the use-of-uninitialized-memory, and deliberately re-adds the test case sans trailing newline for regression testing. MSan report prior to this fix: ``` @@@BUILD_STEP sanitizer logs: stage2/msan_track_origins check@@@ ==clang-scan-deps==616960==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5555599c3300 in isAnnotation /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:131:38 #1 0x5555599c3300 in setLength /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:152:13 #2 0x5555599c3300 in clang::Lexer::FormTokenWithChars(clang::Token&, char const*, clang::tok::TokenKind) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Lexer.h:644:12 #3 0x5555599cf895 in clang::Lexer::LexEndOfFile(clang::Token&, char const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Lexer.cpp:3166:5 #4 0x555559bb229b in clang::Preprocessor::Lex(clang::Token&) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Preprocessor.cpp:916:11 #5 0x555559aa5365 in __invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__type_traits/invoke.h:90:27 #6 0x555559aa5365 in invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__functional/invoke.h:29:10 #7 0x555559aa5365 in operator()<void (clang::Preprocessor::*)(clang::Token &)> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:470:5 #8 0x555559aa5365 in clang::Preprocessor::CheckEndOfDirective(llvm::StringRef, bool, llvm::SmallVectorImpl<clang::Token>*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:478:5 #9 0x555559ab96b5 in clang::Preprocessor::HandleIncludeDirective(clang::SourceLocation, clang::Token&, clang::detail::SearchDirIteratorImpl<true>, clang::FileEntry const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:2205:7 ... ```
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…of-directive edge case (#188590) llvm/llvm-project#186966 was reverted because the test case triggered a use-of-uninitialized-memory (https://lab.llvm.org/buildbot/#/builders/94/builds/16379), due to the include directive omitting a trailing newline. This patch adds a minor fix to avoid the use-of-uninitialized-memory, and deliberately re-adds the test case sans trailing newline for regression testing. MSan report prior to this fix: ``` @@@BUILD_STEP sanitizer logs: stage2/msan_track_origins check@@@ ==clang-scan-deps==616960==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5555599c3300 in isAnnotation /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:131:38 #1 0x5555599c3300 in setLength /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:152:13 #2 0x5555599c3300 in clang::Lexer::FormTokenWithChars(clang::Token&, char const*, clang::tok::TokenKind) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Lexer.h:644:12 #3 0x5555599cf895 in clang::Lexer::LexEndOfFile(clang::Token&, char const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Lexer.cpp:3166:5 #4 0x555559bb229b in clang::Preprocessor::Lex(clang::Token&) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Preprocessor.cpp:916:11 #5 0x555559aa5365 in __invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__type_traits/invoke.h:90:27 #6 0x555559aa5365 in invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__functional/invoke.h:29:10 #7 0x555559aa5365 in operator()<void (clang::Preprocessor::*)(clang::Token &)> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:470:5 #8 0x555559aa5365 in clang::Preprocessor::CheckEndOfDirective(llvm::StringRef, bool, llvm::SmallVectorImpl<clang::Token>*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:478:5 #9 0x555559ab96b5 in clang::Preprocessor::HandleIncludeDirective(clang::SourceLocation, clang::Token&, clang::detail::SearchDirIteratorImpl<true>, clang::FileEntry const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:2205:7 ... ```
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Close llvm#185394 This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that.
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Aadarsh-Keshri
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…86966) (llvm#188401) Close llvm#185394 This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that.
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…e edge case (llvm#188590) llvm#186966 was reverted because the test case triggered a use-of-uninitialized-memory (https://lab.llvm.org/buildbot/#/builders/94/builds/16379), due to the include directive omitting a trailing newline. This patch adds a minor fix to avoid the use-of-uninitialized-memory, and deliberately re-adds the test case sans trailing newline for regression testing. MSan report prior to this fix: ``` @@@BUILD_STEP sanitizer logs: stage2/msan_track_origins check@@@ ==clang-scan-deps==616960==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5555599c3300 in isAnnotation /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:131:38 llvm#1 0x5555599c3300 in setLength /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:152:13 llvm#2 0x5555599c3300 in clang::Lexer::FormTokenWithChars(clang::Token&, char const*, clang::tok::TokenKind) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Lexer.h:644:12 llvm#3 0x5555599cf895 in clang::Lexer::LexEndOfFile(clang::Token&, char const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Lexer.cpp:3166:5 llvm#4 0x555559bb229b in clang::Preprocessor::Lex(clang::Token&) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Preprocessor.cpp:916:11 llvm#5 0x555559aa5365 in __invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__type_traits/invoke.h:90:27 llvm#6 0x555559aa5365 in invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__functional/invoke.h:29:10 llvm#7 0x555559aa5365 in operator()<void (clang::Preprocessor::*)(clang::Token &)> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:470:5 llvm#8 0x555559aa5365 in clang::Preprocessor::CheckEndOfDirective(llvm::StringRef, bool, llvm::SmallVectorImpl<clang::Token>*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:478:5 llvm#9 0x555559ab96b5 in clang::Preprocessor::HandleIncludeDirective(clang::SourceLocation, clang::Token&, clang::detail::SearchDirIteratorImpl<true>, clang::FileEntry const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:2205:7 ... ```
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…e edge case (llvm#188590) llvm#186966 was reverted because the test case triggered a use-of-uninitialized-memory (https://lab.llvm.org/buildbot/#/builders/94/builds/16379), due to the include directive omitting a trailing newline. This patch adds a minor fix to avoid the use-of-uninitialized-memory, and deliberately re-adds the test case sans trailing newline for regression testing. MSan report prior to this fix: ``` @@@BUILD_STEP sanitizer logs: stage2/msan_track_origins check@@@ ==clang-scan-deps==616960==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5555599c3300 in isAnnotation /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:131:38 llvm#1 0x5555599c3300 in setLength /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:152:13 llvm#2 0x5555599c3300 in clang::Lexer::FormTokenWithChars(clang::Token&, char const*, clang::tok::TokenKind) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Lexer.h:644:12 llvm#3 0x5555599cf895 in clang::Lexer::LexEndOfFile(clang::Token&, char const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Lexer.cpp:3166:5 llvm#4 0x555559bb229b in clang::Preprocessor::Lex(clang::Token&) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Preprocessor.cpp:916:11 llvm#5 0x555559aa5365 in __invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__type_traits/invoke.h:90:27 llvm#6 0x555559aa5365 in invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__functional/invoke.h:29:10 llvm#7 0x555559aa5365 in operator()<void (clang::Preprocessor::*)(clang::Token &)> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:470:5 llvm#8 0x555559aa5365 in clang::Preprocessor::CheckEndOfDirective(llvm::StringRef, bool, llvm::SmallVectorImpl<clang::Token>*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:478:5 llvm#9 0x555559ab96b5 in clang::Preprocessor::HandleIncludeDirective(clang::SourceLocation, clang::Token&, clang::detail::SearchDirIteratorImpl<true>, clang::FileEntry const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:2205:7 ... ```
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Reverts llvm/llvm-project#186966 (cherry picked from commit 047cd90)
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…e edge case (#188590) llvm/llvm-project#186966 was reverted because the test case triggered a use-of-uninitialized-memory (https://lab.llvm.org/buildbot/#/builders/94/builds/16379), due to the include directive omitting a trailing newline. This patch adds a minor fix to avoid the use-of-uninitialized-memory, and deliberately re-adds the test case sans trailing newline for regression testing. MSan report prior to this fix: ``` @@@BUILD_STEP sanitizer logs: stage2/msan_track_origins check@@@ ==clang-scan-deps==616960==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5555599c3300 in isAnnotation /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:131:38 #1 0x5555599c3300 in setLength /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Token.h:152:13 #2 0x5555599c3300 in clang::Lexer::FormTokenWithChars(clang::Token&, char const*, clang::tok::TokenKind) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/Lex/Lexer.h:644:12 #3 0x5555599cf895 in clang::Lexer::LexEndOfFile(clang::Token&, char const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Lexer.cpp:3166:5 qualcomm#4 0x555559bb229b in clang::Preprocessor::Lex(clang::Token&) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/Preprocessor.cpp:916:11 qualcomm#5 0x555559aa5365 in __invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__type_traits/invoke.h:90:27 qualcomm#6 0x555559aa5365 in invoke<void (clang::Preprocessor::*&)(clang::Token &), clang::Preprocessor *, clang::Token &> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/libcxx_install_msan_track_origins/include/c++/v1/__functional/invoke.h:29:10 qualcomm#7 0x555559aa5365 in operator()<void (clang::Preprocessor::*)(clang::Token &)> /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:470:5 qualcomm#8 0x555559aa5365 in clang::Preprocessor::CheckEndOfDirective(llvm::StringRef, bool, llvm::SmallVectorImpl<clang::Token>*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:478:5 qualcomm#9 0x555559ab96b5 in clang::Preprocessor::HandleIncludeDirective(clang::SourceLocation, clang::Token&, clang::detail::SearchDirIteratorImpl<true>, clang::FileEntry const*) /home/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Lex/PPDirectives.cpp:2205:7 ... ``` (cherry picked from commit f1889a7)
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Close #185394
This is only for P1689 format as ClangScanDeps/optimize-vfs-pch.m will check for warning message. I'll leave this to people who want to change that.