replace readlink with realpath which behaves more consistently on different linux or even mac

config_brpc.sh

@@ -16,8 +16,8 @@ eval set -- "$TEMP"
 # Convert to abspath always so that generated mk is include-able from everywhere
 while true; do
     case "$1" in
-        --headers ) HDRS_IN="$(readlink -f $2)"; shift 2 ;;
-        --libs ) LIBS_IN="$(readlink -f $2)"; shift 2 ;;
+        --headers ) HDRS_IN="$(realpath $2)"; shift 2 ;;
+        --libs ) LIBS_IN="$(realpath $2)"; shift 2 ;;
         --cc ) CC=$2; shift 2 ;;
         --cxx ) CXX=$2; shift 2 ;;
         --with-glog ) WITH_GLOG=1; shift 1 ;;

docs/cn/getting_started.md

@@ -113,8 +113,6 @@ $ sh config_brpc.sh --headers=.. --libs=..
 $ make
 ```
 
-Note: don't put ~ (tilde) in paths to --headers/--libs, it's not converted.
-
 # Supported deps
 
 ## GCC: 4.8-7.1