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-rw-r--r--clang/lib/Basic/Targets.cpp1
-rw-r--r--clang/test/Preprocessor/init.c7
2 files changed, 8 insertions, 0 deletions
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 46532ff9160..040dedaff14 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -4226,6 +4226,7 @@ public:
: X86_64TargetInfo(Triple) {
TLSSupported = false;
WCharType = UnsignedShort;
+ UserLabelPrefix = "";
}
void getTargetDefines(const LangOptions &Opts,
MacroBuilder &Builder) const override {
diff --git a/clang/test/Preprocessor/init.c b/clang/test/Preprocessor/init.c
index 73dc4b54606..0dd16c74fc0 100644
--- a/clang/test/Preprocessor/init.c
+++ b/clang/test/Preprocessor/init.c
@@ -9049,3 +9049,10 @@
// WEBASSEMBLY64-NEXT:#define __wasm64 1
// WEBASSEMBLY64-NEXT:#define __wasm64__ 1
// WEBASSEMBLY64-NEXT:#define __wasm__ 1
+
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple i686-windows-cygnus < /dev/null | FileCheck -match-full-lines -check-prefix CYGWIN-X32 %s
+// CYGWIN-X32: #define __USER_LABEL_PREFIX__ _
+
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple x86_64-windows-cygnus < /dev/null | FileCheck -match-full-lines -check-prefix CYGWIN-X64 %s
+// CYGWIN-X64: #define __USER_LABEL_PREFIX__
+
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