From e7312a1f81c7ad11c7c6d70f718938dba99de83c Mon Sep 17 00:00:00 2001
From: Gustavo Jose de Sousa <gustavo.sousa@intel.com>
Date: Mon, 30 Nov 2015 19:13:20 -0200
Subject: [PATCH] waf: add toolchain tool for cross-compiling

---
 Tools/ardupilotwaf/toolchain.py | 37 +++++++++++++++++++++++++++++++++
 wscript                         |  1 +
 2 files changed, 38 insertions(+)
 create mode 100644 Tools/ardupilotwaf/toolchain.py

diff --git a/Tools/ardupilotwaf/toolchain.py b/Tools/ardupilotwaf/toolchain.py
new file mode 100644
index 0000000000..1501637ce4
--- /dev/null
+++ b/Tools/ardupilotwaf/toolchain.py
@@ -0,0 +1,37 @@
+"""
+WAF Tool to select the correct toolchain based on the target archtecture.
+
+This tool must be loaded before compiler tools. Use the environment variable
+TOOLCHAIN to define the toolchain prefix.
+
+Example::
+
+    def configure(cfg):
+        cfg.env.TOOLCHAIN = 'arm-linux-gnueabihf'
+        cfg.load('toolchain')
+        cfg.load('cxx_compiler')
+"""
+
+from waflib import Utils
+
+suffixes = dict(
+    CXX='g++',
+    CC='gcc',
+    AS='gcc',
+    AR='ar',
+    LD='g++',
+    GDB='gdb',
+    OBJCOPY='objcopy',
+)
+
+def configure(cfg):
+    if not cfg.env.TOOLCHAIN:
+        cfg.env.TOOLCHAIN = 'native'
+        prefix = ''
+    else:
+        cfg.env.TOOLCHAIN = Utils.to_list(cfg.env.TOOLCHAIN)[0]
+        cfg.msg('Using toolchain prefix', cfg.env.TOOLCHAIN)
+        prefix = cfg.env.TOOLCHAIN + '-'
+
+    for k in suffixes:
+        cfg.env.append_value(k, prefix + suffixes[k])
diff --git a/wscript b/wscript
index 784d9e171b..0450b72fe1 100644
--- a/wscript
+++ b/wscript
@@ -74,6 +74,7 @@ def configure(cfg):
         else:
             cfg.env.prepend_value(k, val)
 
+    cfg.load('toolchain')
     cfg.load('compiler_cxx compiler_c')
     cfg.load('clang_compilation_database')
     cfg.load('waf_unit_test')