waf: add option to override toolchain

Tools/ardupilotwaf/boards.py

@@ -35,7 +35,7 @@ class Board:
         self.with_uavcan = False
 
     def configure(self, cfg):
-        cfg.env.TOOLCHAIN = self.toolchain
+        cfg.env.TOOLCHAIN = cfg.options.toolchain or self.toolchain
         cfg.env.ROMFS_FILES = []
         cfg.load('toolchain')
         cfg.load('cxx_checks')

Tools/ardupilotwaf/toolchain.py

@@ -131,6 +131,8 @@ def configure(cfg):
     _filter_supported_c_compilers('gcc', 'clang')
     _filter_supported_cxx_compilers('g++', 'clang++')
 
+    cfg.msg('Using toolchain', cfg.env.TOOLCHAIN)
+
     if cfg.env.TOOLCHAIN == 'native':
         cfg.load('compiler_cxx compiler_c')
 
@@ -139,8 +141,6 @@ def configure(cfg):
 
         return
 
-    cfg.msg('Using toolchain', cfg.env.TOOLCHAIN)
-
     _set_pkgconfig_crosscompilation_wrapper(cfg)
     cfg.find_program('%s-ar' % cfg.env.TOOLCHAIN, var='AR', quiet=True)
     cfg.load('compiler_cxx compiler_c')

wscript

@@ -75,6 +75,11 @@ def options(opt):
         default=False,
         help='Configure as debug variant.')
 
+    g.add_option('--toolchain',
+        action='store',
+        default=None,
+        help='Override default toolchain used for the board. Use "native" for using the host toolchain.')
+
     g.add_option('--disable-gccdeps',
         action='store_true',
         default=False,