-O2 is the highest warning level understood by MSVC, higher warning
levels produce warnings.
---
 configure | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure b/configure
index 0fc7388..d2c256d 100755
--- a/configure
+++ b/configure
@@ -3214,6 +3214,7 @@ msvc_common_flags(){
             # Common flags
             -fomit-frame-pointer) ;;
             -g)                   echo -Z7 ;;
+            -O[3-9])              echo -O2 ;;
             -fno-math-errno)      ;;
             -fno-common)          ;;
             -fno-signed-zeros)    ;;
-- 
2.1.4

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