diff --git a/llvm-build/README.md b/llvm-build/README.md
index f7be8cf15d394b27d0db1bbfa83124e0e0b8c79a..689ae00beda254663c36f497765d0fa36f074ab7 100644
--- a/llvm-build/README.md
+++ b/llvm-build/README.md
@@ -75,6 +75,8 @@ When build successfully completed. following artifacts will be available in `out
 
 `sysroot` -> sysroots for OHOS targets  
 `install` -> toolchain build  
+
+following artifacts will be available in `packages` directory
 `*.tar.bz2` -> archived versions of toolchain and sysroots  
 </br>
 
diff --git a/llvm-build/build.py b/llvm-build/build.py
index c751738e5dbd8ea7f5d12fda0219a27dcf7b66d7..dd62bc0f36d88694c1656832a2d22bccd098dae7 100755
--- a/llvm-build/build.py
+++ b/llvm-build/build.py
@@ -597,6 +597,7 @@ class LlvmCore(BuildUtils):
         cflags = '-fstack-protector-strong'
         if not self.host_is_darwin():
             ldflags += ' -Wl,-z,relro,-z,now -pie'
+            cflags += ' -D_FORTIFY_SOURCE=2'
             if self.build_config.strip:
                 ldflags += ' -s'
 
@@ -894,6 +895,7 @@ class LlvmLibs(BuildUtils):
                 '--target=%s' % llvm_triple,
                 '-ffunction-sections',
                 '-fdata-sections',
+                '-D_FORTIFY_SOURCE=2',
                 extra_flags, ]
 
         cflags.extend(cflag)