[oe] [PATCH v2 1/2] external-toolchain: allow override of linux-libc-headers provider

[Ben Gardiner]

only set PREFERRED_PROVIDER_linux-libc-headers if it is not
already assigned a value.

Signed-off-by: Ben Gardiner <bengardiner at nanometrics.ca>
Tested-by: Andrea Galbusera <gizero at gmail.com>

---

Changes since v1:
 * rebased to 3dc72c4ca0a9ce677f6c3a56517626984b5eaaa0 of
   git://git.openembedded.org/openembedded#master
 * added Tested-by: Andrea Galbusera <gizero at gmail.com>

---
 conf/distro/include/toolchain-external.inc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/conf/distro/include/toolchain-external.inc b/conf/distro/include/toolchain-external.inc
index ab50308..12dc454 100644
--- a/conf/distro/include/toolchain-external.inc
+++ b/conf/distro/include/toolchain-external.inc
@@ -4,7 +4,7 @@ PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc-initial = "external-toolchain-${T
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc-intermediate = "external-toolchain-${TOOLCHAIN_BRAND}"
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc = "external-toolchain-${TOOLCHAIN_BRAND}"
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}g++ = "external-toolchain-${TOOLCHAIN_BRAND}"
-PREFERRED_PROVIDER_linux-libc-headers = "external-toolchain-${TOOLCHAIN_BRAND}"
+PREFERRED_PROVIDER_linux-libc-headers ?= "external-toolchain-${TOOLCHAIN_BRAND}"
 
 TOOLCHAIN_VENDOR ?= "${TARGET_VENDOR}"
 TARGET_VENDOR := "${TOOLCHAIN_VENDOR}"
-- 
1.7.1