ICU-7721 Check to see if both CXXFLAGS and CFLAGS were not set already.

X-SVN-Rev: 28770
diff --git a/icu4c/source/configure b/icu4c/source/configure
index cca42d0..89fddbe 100755
--- a/icu4c/source/configure
+++ b/icu4c/source/configure
@@ -3843,10 +3843,16 @@
     if test "$CFLAGS" = ""; then
         if test "$ENABLE_DEBUG" = 1; then
             CFLAGS=-g
-            CXXFLAGS=-g
         fi
         if test "$ENABLE_RELEASE" = 1; then
             CFLAGS="$CFLAGS -O2"
+        fi
+    fi
+    if test "$CXXFLAGS" = ""; then
+        if test "$ENABLE_DEBUG" = 1; then
+            CXXFLAGS=-g
+        fi
+        if test "$ENABLE_RELEASE" = 1; then
             CXXFLAGS="$CXXFLAGS -O2"
         fi
     fi
diff --git a/icu4c/source/configure.in b/icu4c/source/configure.in
index 6b01d0f..107912b 100644
--- a/icu4c/source/configure.in
+++ b/icu4c/source/configure.in
@@ -120,10 +120,16 @@
     if test "$CFLAGS" = ""; then
         if test "$ENABLE_DEBUG" = 1; then
             CFLAGS=-g
-            CXXFLAGS=-g
         fi
         if test "$ENABLE_RELEASE" = 1; then
             CFLAGS="$CFLAGS -O2"
+        fi
+    fi
+    if test "$CXXFLAGS" = ""; then
+        if test "$ENABLE_DEBUG" = 1; then
+            CXXFLAGS=-g
+        fi
+        if test "$ENABLE_RELEASE" = 1; then
             CXXFLAGS="$CXXFLAGS -O2"
         fi
     fi