Subject: [PATCH 1/5] CMakeDetermineSystem: use oe environment vars to load default toolchain file in sdk

From: Cody P Schafer <[email-masked]>
Date: Thu, 27 Apr 2017 11:35:05 -0400

Passing the toolchain by:

 - shell aliases does not work if cmake is called by a script
 - unconditionally by a wrapper script causes cmake to believe it is
   configuring things when it is not (for example, `cmake --build` breaks).

The OE_CMAKE_TOOLCHAIN_FILE variable is only used as a default if no
toolchain is explicitly specified.

Setting the CMAKE_TOOLCHAIN_FILE cmake variable is marked as cached
because '-D' options are cache entries themselves.

Upstream-Status: Inappropriate [oe-core specific]
Signed-off-by: Cody P Schafer <[email-masked]>
Signed-off-by: Otavio Salvador <[email-masked]>
---
 Modules/CMakeDetermineSystem.cmake | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Modules/CMakeDetermineSystem.cmake b/Modules/CMakeDetermineSystem.cmake
index 600d5580e..32d7f1945 100644
--- a/Modules/CMakeDetermineSystem.cmake
+++ b/Modules/CMakeDetermineSystem.cmake
@@ -82,6 +82,13 @@ else()
   endif()
 endif()
 
+if(NOT DEFINED CMAKE_TOOLCHAIN_FILE)
+  if(DEFINED ENV{OE_CMAKE_TOOLCHAIN_FILE})
+    set(CMAKE_TOOLCHAIN_FILE "$ENV{OE_CMAKE_TOOLCHAIN_FILE}" CACHE FILEPATH "toolchain file")
+    message(STATUS "Toolchain file defaulted to '${CMAKE_TOOLCHAIN_FILE}'")
+  endif()
+endif()
+
 # if a toolchain file is used, the user wants to cross compile.
 # in this case read the toolchain file and keep the CMAKE_HOST_SYSTEM_*
 # variables around so they can be used in CMakeLists.txt.
-- 
2.18.0