diff --git a/.gitignore b/.gitignore
index 6a9e42b8b21913e6bf2417876ff1fbcae1e68027..494dbb8196db3ccf7bd542e63e55ec96207d835e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,8 @@
 build/*
 build_*
 cmake-build-*/*
+build
+.cache/*
 .DS_Store
 .idea
 .ccls-cache
diff --git a/build.sh b/build.sh
index b45356b2aac5f17b599c1f649cd9c225278b97be..7dfa01c3eb5fb68905668f864e5d70cdd780a800 100755
--- a/build.sh
+++ b/build.sh
@@ -114,7 +114,11 @@ function do_init
 function prepare_build_dir
 {
   TYPE=$1
-  mkdir -p ${TOPDIR}/build_${TYPE} && cd ${TOPDIR}/build_${TYPE}
+  mkdir -p ${TOPDIR}/build_${TYPE}
+  rm -f build
+  echo "create soft link for build_${TYPE}, linked by directory named build"
+  ln -s build_${TYPE} build
+  cd ${TOPDIR}/build_${TYPE}
 }
 
 function do_build