diff options
Diffstat (limited to 'cmake/FindKernelHeaders.cmake')
| -rw-r--r-- | cmake/FindKernelHeaders.cmake | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/cmake/FindKernelHeaders.cmake b/cmake/FindKernelHeaders.cmake new file mode 100644 index 0000000..60d2380 --- /dev/null +++ b/cmake/FindKernelHeaders.cmake @@ -0,0 +1,45 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (C) 2020 Manuel Bentele <development@manuel-bentele.de> +# + +# check if custom Linux kernel build directory was specified +if(NOT KERNEL_BUILD_DIR) + set(KERNEL_BUILD_DIR "/lib/modules/${CMAKE_SYSTEM_VERSION}/build" + CACHE PATH "Path to Linux kernel modules to compile against") +endif(NOT KERNEL_BUILD_DIR) + +# check if custom Linux kernel output directory was specified +if(NOT KERNEL_INSTALL_DIR) + set(KERNEL_INSTALL_DIR "/lib/modules/${CMAKE_SYSTEM_VERSION}/extra" + CACHE PATH "Path to install Linux kernel modules") +endif(NOT KERNEL_INSTALL_DIR) + +# find the Linux kernel headers from given KERNEL_BUILD_DIR +find_path(KernelHeaders_INCLUDE_DIR + NAMES linux/user.h + PATHS ${KERNEL_BUILD_DIR}/include) + +# get Linux kernel headers version +string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" KernelHeaders_VERSION ${KernelHeaders_INCLUDE_DIR}) + +include(FindPackageHandleStandardArgs) +find_package_handle_standard_args(KernelHeaders + FOUND_VAR KernelHeaders_FOUND + REQUIRED_VARS KernelHeaders_INCLUDE_DIR + VERSION_VAR KernelHeaders_VERSION + FAIL_MESSAGE "Linux kernel headers are not available! Please install them to build kernel modules!") + +if(KernelHeaders_FOUND) + set(KernelHeaders_INCLUDE_DIRS ${KernelHeaders_INCLUDE_DIR}/include + CACHE PATH "Path to Linux kernel header includes") +endif(KernelHeaders_FOUND) + +mark_as_advanced(KernelHeaders_INCLUDE_DIR KernelHeaders_MODULE_INSTALL_DIR) + +# print found information +message(VERBOSE "KERNEL_BUILD_DIR: ${KERNEL_BUILD_DIR}") +message(VERBOSE "KERNEL_INSTALL_DIR: ${KERNEL_INSTALL_DIR}") +message(VERBOSE "KernelHeaders_FOUND: ${KernelHeaders_FOUND}") +message(VERBOSE "KernelHeaders_VERSION: ${KernelHeaders_VERSION}") +message(VERBOSE "KernelHeaders_INCLUDE_DIRS: ${KernelHeaders_INCLUDE_DIRS}") |