From f60c9d4f39f8ca8948594a773eee43543ca37807 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Thu, 28 Aug 2014 09:43:40 -0600
Subject: buildman: Allow make-flags variables to include '-' and '_'

These characters are commonly used in variables, so permit them. Also
document the permitted characters.

Reported-by: Tom Rini <trini@ti.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/tools/buildman/README b/tools/buildman/README
index d20508f..68465b4 100644
--- a/tools/buildman/README
+++ b/tools/buildman/README
@@ -670,7 +670,9 @@ snapper9g45=${at91-boards} BUILD_TAG=443
 This will use 'make ENABLE_AT91_TEST=1 BUILD_TAG=442' for snapper9260
 and 'make ENABLE_AT91_TEST=1 BUILD_TAG=443' for snapper9g45. A special
 variable ${target} is available to access the target name (snapper9260 and
-snapper9g20 in this case). Variables are resolved recursively.
+snapper9g20 in this case). Variables are resolved recursively. Note that
+variables can only contain the characters A-Z, a-z, 0-9, hyphen (-) and
+underscore (_).
 
 It is expected that any variables added are dealt with in U-Boot's
 config.mk file and documented in the README.
diff --git a/tools/buildman/toolchain.py b/tools/buildman/toolchain.py
index 1b9771f..0e91294 100644
--- a/tools/buildman/toolchain.py
+++ b/tools/buildman/toolchain.py
@@ -198,7 +198,7 @@ class Toolchains:
         >>> tcs.ResolveReferences(var_dict, 'this=${oblique}_set${first}nd')
         'this=OBLIQUE_setfi2ndrstnd'
         """
-        re_var = re.compile('(\$\{[a-z0-9A-Z]{1,}\})')
+        re_var = re.compile('(\$\{[-_a-z0-9A-Z]{1,}\})')
 
         while True:
             m = re_var.search(args)
-- 
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