buildman: Add options to get the arch and toolchain info

Sometimes it is useful for external tools to use buildman to provide the
toolchain information. Add an -a option which shows the value to use for
the ARCH environment variable, and -A which does the same for
CROSS_COMPILE

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/tools/buildman/toolchain.py b/tools/buildman/toolchain.py
index 086a4d47cd..4f39bfd0ce 100644
--- a/tools/buildman/toolchain.py
+++ b/tools/buildman/toolchain.py
@@ -18,6 +18,8 @@ import tools
 (PRIORITY_FULL_PREFIX, PRIORITY_PREFIX_GCC, PRIORITY_PREFIX_GCC_PATH,
     PRIORITY_CALC) = list(range(4))
 
+(VAR_CROSS_COMPILE, VAR_PATH, VAR_ARCH, VAR_MAKE_ARGS) = range(4)
+
 # Simple class to collect links from a page
 class MyHTMLParser(HTMLParser):
     def __init__(self, arch):
@@ -145,6 +147,30 @@ class Toolchain:
 
         return value
 
+    def GetEnvArgs(self, which):
+        """Get an environment variable/args value based on the the toolchain
+
+        Args:
+            which: VAR_... value to get
+
+        Returns:
+            Value of that environment variable or arguments
+        """
+        wrapper = self.GetWrapper()
+        if which == VAR_CROSS_COMPILE:
+            return wrapper + os.path.join(self.path, self.cross)
+        elif which == VAR_PATH:
+            return self.path
+        elif which == VAR_ARCH:
+            return self.arch
+        elif which == VAR_MAKE_ARGS:
+            args = self.MakeArgs()
+            if args:
+                return ' '.join(args)
+            return ''
+        else:
+            raise ValueError('Unknown arg to GetEnvArgs (%d)' % which)
+
     def MakeEnvironment(self, full_path):
         """Returns an environment for using the toolchain.