Merge remote-tracking branch 'origin/master' into dab

[staging/xdg-launcher.git] / cmake / cmake.d / 04-build_options.cmake

diff --git a/cmake/cmake.d/04-build_options.cmake b/cmake/cmake.d/04-build_options.cmake
index 899505f..18a1b17 100644 (file)
--- a/cmake/cmake.d/04-build_options.cmake
+++ b/cmake/cmake.d/04-build_options.cmake
@@ -33,26 +33,23 @@ if (gcc_minimal_version)
        endif()
 endif(gcc_minimal_version)
 
-# Check Kernel minimal version
+# Check Kernel mandatory version, will fail the configuration if required version not matched.
+if (kernel_mandatory_version)
+       message (STATUS "${Cyan}-- Check kernel_mandatory_version (found kernel version ${KERNEL_VERSION})${ColourReset}")
+       if (KERNEL_VERSION VERSION_LESS ${kernel_mandatory_version})
+               message(FATAL_ERROR "${Red}**** FATAL: Require at least ${kernel_mandatory_version} please use a recent kernel or source your SDK environment then clean and reconfigure your CMake project.")
+       endif (KERNEL_VERSION VERSION_LESS ${kernel_mandatory_version})
+endif(kernel_mandatory_version)
+
+# Check Kernel minimal version just print a Warning about missing features
+# and set a definition to be used as preprocessor condition in code to disable
+# incompatibles features.
 if (kernel_minimal_version)
-       if(DEFINED ENV{SDKTARGETSYSROOT})
-               file(STRINGS $ENV{SDKTARGETSYSROOT}/usr/include/linux/version.h LINUX_VERSION_CODE_LINE REGEX "LINUX_VERSION_CODE")
-       elseif(DEFINED ENV{PKG_CONFIG_SYSROOT_DIR})
-               file(STRINGS $ENV{PKG_CONFIG_SYSROOT_DIR}/usr/include/linux/version.h LINUX_VERSION_CODE_LINE REGEX "LINUX_VERSION_CODE")
-       else()
-               file(STRINGS /usr/include/linux/version.h LINUX_VERSION_CODE_LINE REGEX "LINUX_VERSION_CODE")
-       endif()
-
-       string(REGEX MATCH "[0-9]+" LINUX_VERSION_CODE ${LINUX_VERSION_CODE_LINE})
-       math(EXPR a "${LINUX_VERSION_CODE} >> 16")
-       math(EXPR b "(${LINUX_VERSION_CODE} >> 8) & 255")
-       math(EXPR c "(${LINUX_VERSION_CODE} & 255)")
-
-       set(KERNEL_VERSION "${a}.${b}.${c}")
        message (STATUS "${Cyan}-- Check kernel_minimal_version (found kernel version ${KERNEL_VERSION})${ColourReset}")
-
        if (KERNEL_VERSION VERSION_LESS ${kernel_minimal_version})
-               message(FATAL_ERROR "${Red}**** FATAL: Require at least ${kernel_minimal_version} please use a recent kernel or source your SDK environment then clean and reconfigure your CMake project.")
+               message(WARNING "${Yellow}**** Warning: Some feature(s) require at least ${kernel_minimal_version}. Please use a recent kernel or source your SDK environment then clean and reconfigure your CMake project.${ColourReset}")
+       else (KERNEL_VERSION VERSION_LESS ${kernel_minimal_version})
+               add_definitions(-DKERNEL_MINIMAL_VERSION_OK)
        endif (KERNEL_VERSION VERSION_LESS ${kernel_minimal_version})
 endif(kernel_minimal_version)