mk: allow to override devel mode from environment

RTE_DEVEL_BUILD is set to := y in mk/rte.vars.mk, which makes it
impossible to override via an environment variable, and forces users
to pass it inline in the make call.
Use ?= instead to have it pick up the environment variable as well.

Signed-off-by: Luca Boccassi <lboccass@brocade.com>
Acked-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

diff --git a/mk/rte.vars.mk b/mk/rte.vars.mk
index c240a0e..418e49a 100644 (file)
--- a/mk/rte.vars.mk
+++ b/mk/rte.vars.mk
@@ -107,7 +107,7 @@ export RTE_TOOLCHAIN
 
 # developer build automatically enabled in a git tree
 ifneq ($(wildcard $(RTE_SDK)/.git),)
-RTE_DEVEL_BUILD := y
+RTE_DEVEL_BUILD ?= y
 endif
 
 # SRCDIR is the current source directory