2 Kernel checks available (warning or mandatory)

Use 2 differents checks, one specify a mandatory kernel version
and the other will output a warning and position a preprocessing
variable that can be used in the code to exclude portions of code
that use kernel features not available under a certain version.

Change-Id: Ifc6848df1a1a448094f5312ea23e6d4837e8ef14
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 11 insertions, 3 deletions

diff --git a/cmake/config.cmake.sample b/cmake/config.cmake.sample
index fb878a2..b1dda58 100644
--- a/cmake/config.cmake.sample
+++ b/cmake/config.cmake.sample
@@ -47,10 +47,18 @@ set(PROJECT_APP_TEMPLATES_DIR "conf.d/app-templates")
 # ----------------------------------
 set(CMAKE_BUILD_TYPE "DEBUG")
 
-# Kernel selection if needed. Impose a minimal version.
-# NOTE FOR NOW IT CHECKS KERNEL Yocto SDK Kernel version
-# else only HOST VERSION
+# Kernel selection if needed. You can choose between a
+# mandatory version to Impose a minimal version.
+# else only HOST VERSION. Or check Kernel minimal version
+# and just print a Warning about missing features and set
+# a define variable to be used as preprocessor condition
+# in code to disable incompatibles features. Preprocessor
+# define is named KERNEL_MINIMAL_VERSION_OK.
+#
+# NOTE*** FOR NOW IT CHECKS KERNEL Yocto environment and
+# Yocto SDK Kernel version.
 # -----------------------------------------------
+#set (kernel_mandatory_version 4.8)
 #set (kernel_minimal_version 4.8)
 
 # Compiler selection if needed. Impose a minimal version.