Makefile

   1 # SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2
   3 ifneq ($(KERNELRELEASE),)
   4
   5   # This part of the Makefile is used when called by the kernel build system
   6   # and defines the modules to be built.
   7
   8   ifdef CONFIG_LOCALVERSION     # Check if dot-config is included.
   9     ifeq ($(CONFIG_TRACEPOINTS),)
  10       $(error The option CONFIG_TRACEPOINTS needs to be enabled in your kernel configuration)
  11     endif # CONFIG_TRACEPOINTS
  12   endif # ifdef CONFIG_LOCALVERSION
  13
  14   TOP_LTTNG_MODULES_DIR := $(shell dirname $(lastword $(MAKEFILE_LIST)))
  15
  16   lttng_check_linux_version = $(shell pwd)/include/linux/version.h
  17   lttng_check_generated_linux_version = $(shell pwd)/include/generated/uapi/linux/version.h
  18
  19   #
  20   # Check for stale version.h, which can be a leftover from an old Linux
  21   # kernel tree moved to a newer kernel version, only pruned by make
  22   # distclean.
  23   #
  24   ifneq ($(wildcard $(lttng_check_linux_version)),)
  25     ifneq ($(wildcard $(lttng_check_generated_linux_version)),)
  26       $(error Duplicate version.h files found in $(lttng_check_linux_version) and $(lttng_check_generated_linux_version). Consider running make distclean on your kernel, or removing the stale $(lttng_check_linux_version) file)
  27     endif
  28   endif
  29
  30   obj-$(CONFIG_LTTNG) += src/
  31   obj-$(CONFIG_LTTNG) += tests/
  32
  33 else # KERNELRELEASE
  34
  35 # This part of the Makefile is used when the 'make' command is runned in the
  36 # base directory of the lttng-modules sources. It sets some environment and
  37 # calls the kernel build system to build the actual modules.
  38
  39 KERNELDIR ?= /lib/modules/$(shell uname -r)/build
  40 PWD := $(shell pwd)
  41 CFLAGS = $(EXTCFLAGS)
  42
  43 default: modules
  44
  45 modules:
  46         $(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m modules
  47
  48 modules_install:
  49         $(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m modules_install
  50
  51 clean:
  52         $(MAKE) -C $(KERNELDIR) M=$(PWD) clean
  53
  54 %.i: %.c
  55         $(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m $@
  56
  57 endif # KERNELRELEASE