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-rw-r--r--src/google/protobuf/stubs/stringprintf.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/google/protobuf/stubs/stringprintf.cc b/src/google/protobuf/stubs/stringprintf.cc
index d66a497a..4a5b8582 100644
--- a/src/google/protobuf/stubs/stringprintf.cc
+++ b/src/google/protobuf/stubs/stringprintf.cc
@@ -44,6 +44,11 @@ namespace protobuf {
#ifdef _MSC_VER
enum { IS_COMPILER_MSVC = 1 };
+#ifndef va_copy
+// Define va_copy for MSVC. This is a hack, assuming va_list is simply a
+// pointer into the stack and is safe to copy.
+#define va_copy(dest, src) ((dest) = (src))
+#endif
#else
enum { IS_COMPILER_MSVC = 0 };
#endif