Fix cmake build with sdk inside a script

For the sdk build the cmake config file is source:
sysroots/x86_64-aglsdk-linux/environment-setup.d/cmake.sh

But use "alias" :
alias cmake="cmake ..."

Unfortunatly alias is not expand inside a script.

using an environnement variable for "CMAKE_TOOLCHAIN_FILE" solve the
issue.

This Fix is a port of the yocto FIX 139551:
https://patchwork.openembedded.org/patch/139551/
Unfortunatly this patch is not include in yocto upstream

Bug-AGL: SPEC-1530

Change-Id: Ica80f66cbe976a6ccb1acb7d96b4c4ce4252d4f3
Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>

2 files changed, 46 insertions, 0 deletions

diff --git a/meta-agl-profile-core/recipes-devtools/cmake/files/0001-CMakeDetermineSystem-use-oe-environment-vars-to-load.patch b/meta-agl-profile-core/recipes-devtools/cmake/files/0001-CMakeDetermineSystem-use-oe-environment-vars-to-load.patch
new file mode 100644
index 000000000..a2332879c
--- /dev/null
+++ b/meta-agl-profile-core/recipes-devtools/cmake/files/0001-CMakeDetermineSystem-use-oe-environment-vars-to-load.patch
@@ -0,0 +1,45 @@
+From a42cfebcd6c684cccf8ad33e5bd5130f7cdba135 Mon Sep 17 00:00:00 2001
+From: Cody P Schafer <dev@codyps.com>
+Date: Thu, 27 Apr 2017 11:35:05 -0400
+Subject: [PATCH] CMakeDetermineSystem: use oe environment vars to load default
+ toolchain file in sdk
+
+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 <dev@codyps.com>
+---
+ Modules/CMakeDetermineSystem.cmake | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/Modules/CMakeDetermineSystem.cmake b/Modules/CMakeDetermineSystem.cmake
+index f34ec5d61..bcac3ef16 100644
+--- a/Modules/CMakeDetermineSystem.cmake
++++ b/Modules/CMakeDetermineSystem.cmake
+@@ -74,6 +74,13 @@ 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.
+-- 
+2.12.2
+
diff --git a/meta-agl-profile-core/recipes-devtools/cmake/files/environment.d-cmake-agl.sh b/meta-agl-profile-core/recipes-devtools/cmake/files/environment.d-cmake-agl.sh
new file mode 100644
index 000000000..64b6cf3c6
--- /dev/null
+++ b/meta-agl-profile-core/recipes-devtools/cmake/files/environment.d-cmake-agl.sh
@@ -0,0 +1 @@
+export OE_CMAKE_TOOLCHAIN_FILE="$OECORE_NATIVE_SYSROOT/usr/share/cmake/OEToolchainConfig.cmake"