[OE-core] [PATCH 14/18] waf.bbclass: support do patch on extracted files

[Hongxu Jia]

Along with do_unpack, run './waf --help' to do the self extract,
so we could do patch on the extracted files later.

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta/classes/waf.bbclass | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/meta/classes/waf.bbclass b/meta/classes/waf.bbclass
index 5e55833..a36bdd4 100644
--- a/meta/classes/waf.bbclass
+++ b/meta/classes/waf.bbclass
@@ -23,8 +23,17 @@ def get_waf_parallel_make(d):
 
     return ""
 
+do_unpack[postfuncs] += "unpack_waf"
+do_unpack[vardeps] += "unpack_waf"
+unpack_waf() {
+	# Just self extract tarball embedded in waf, do not care help message.
+	# Do not generate bytecode, becuase we may need to patch python file
+        # later
+	PYTHONDONTWRITEBYTECODE=True ./waf --help >/dev/null
+}
+
 waf_do_configure() {
-	${S}/waf configure --prefix=${prefix} ${EXTRA_OECONF}
+	${CACHED_CONFIGUREVARS} ${S}/waf configure --prefix=${prefix} ${EXTRA_OECONF}
 }
 
 waf_do_compile()  {
-- 
1.9.1