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-rw-r--r--auto/cc/gcc2
1 files changed, 1 insertions, 1 deletions
diff --git a/auto/cc/gcc b/auto/cc/gcc
index e377fced8..8ac76fb98 100644
--- a/auto/cc/gcc
+++ b/auto/cc/gcc
@@ -147,7 +147,7 @@ fi
# warnings
# -W requires at least -O
-CFLAGS="$CFLAGS ${NGX_GCC_OPT:-O} -W"
+CFLAGS="$CFLAGS ${NGX_GCC_OPT:--O} -W"
CFLAGS="$CFLAGS -Wall -Wpointer-arith"
#CFLAGS="$CFLAGS -Wconversion"