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-rw-r--r--clang/test/Sema/format-strings.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/clang/test/Sema/format-strings.c b/clang/test/Sema/format-strings.c
index 2d6e719e3ad..ec070a291b1 100644
--- a/clang/test/Sema/format-strings.c
+++ b/clang/test/Sema/format-strings.c
@@ -1,5 +1,8 @@
// RUN: clang -fsyntax-only -verify %s
+// Define this to get vasprintf on Linux
+#define _GNU_SOURCE
+
#include <stdio.h>
#include <stdarg.h>
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