Add env var SMING_TOOLCHAINS to allow easier change of toolchains ins…

…tall path.

Tools/export.sh

@@ -32,15 +32,18 @@ fi
 # Common
 export PYTHON=${PYTHON:=$(which python3)}
 
+# Toolchain paths
+export SMING_TOOLCHAINS=${ESP_HOME:=/opt}
+
 # Esp8266
-export ESP_HOME=${ESP_HOME:=/opt/esp-quick-toolchain}
+export ESP_HOME=${ESP_HOME:=$SMING_TOOLCHAINS/esp-quick-toolchain}
 
 # Esp32
-export IDF_PATH=${IDF_PATH:=/opt/esp-idf}
-export IDF_TOOLS_PATH=${IDF_TOOLS_PATH:=/opt/esp32}
+export IDF_PATH=${IDF_PATH:=$SMING_TOOLCHAINS/esp-idf}
+export IDF_TOOLS_PATH=${IDF_TOOLS_PATH:=$SMING_TOOLCHAINS/esp32}
 
 # Rp2040
-export PICO_TOOLCHAIN_PATH=${PICO_TOOLCHAIN_PATH:=/opt/rp2040}
+export PICO_TOOLCHAIN_PATH=${PICO_TOOLCHAIN_PATH:=$SMING_TOOLCHAINS/rp2040}
 
 # Provide non-apple CLANG (e.g. for rbpf library)
 if [ -n "$GITHUB_ACTIONS" ] && [ "$(uname)" = "Darwin" ]; then

docs/source/getting-started/config.rst

@@ -15,6 +15,14 @@ For Linux and WSL2, append values to your ``~/.bashrc`` file::
 
    # All architectures
    export SMING_HOME=/opt/sming/Sming
+   
+
+If you want to change the location where the toolchain will be downloaded and installed you can append the values below::
+	
+   # Specifies a common toolchains directory
+   export SMING_TOOLCHAINS=/opt
+   
+If you don't specify :envvar:`SMING_TOOLCHAINS` then you should set the path for the toolchains that you have installed. As given below::   
 
    # Esp8266
    export ESP_HOME=/opt/esp-quick-toolchain