--- ./icu4c/source/runConfigureICU       2020-09-16 10:29:53.446938469 +0800
+++ ./icu4c/source/runConfigureICU_cflags      2020-04-23 01:49:10.000000000 +0800
@@ -247,7 +247,7 @@ case $platform in
     Linux*)
         THE_OS="Linux"
         THE_COMP="the clang or else GNU C++"
-        RELEASE_CFLAGS='-O3'
+        RELEASE_CFLAGS='-fstack-protector -D_FORTIFY_SOURCE=2 -O3'
-        RELEASE_CXXFLAGS='-O3'
+        RELEASE_CXXFLAGS='-fstack-protector -D_FORTIFY_SOURCE=2 -O3'
         DEBUG_CFLAGS='-g'
         DEBUG_CXXFLAGS='-g'