From 88c9e22eb25d4631aad341443fa8821a82f80741 Mon Sep 17 00:00:00 2001
From: Chun Kuan Lee <ken2812221@gmail.com>
Date: Tue, 12 Jun 2018 07:50:14 +0000
Subject: [PATCH] Reset default -g -O2 flags when enable debug

---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index c2b91333d..0da83d5a5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -188,6 +188,10 @@ AC_LANG_PUSH([C++])
 AX_CHECK_COMPILE_FLAG([-Werror],[CXXFLAG_WERROR="-Werror"],[CXXFLAG_WERROR=""])
 
 if test "x$enable_debug" = xyes; then
+  # Clear default -g -O2 flags
+  if test "x$CXXFLAGS_overridden" = xno; then
+	CXXFLAGS=""
+  fi
   # Prefer -Og, fall back to -O0 if that is unavailable.
   AX_CHECK_COMPILE_FLAG(
     [-Og],