Makefile

   1 # SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2
   3 ifneq ($(KERNELRELEASE),)
   4
   5 # This part of the Makefile is used when called by the kernel build system
   6 # and defines the modules to be built.
   7
   8 obj-$(CONFIG_LTTNG) += src/
   9
  10 else # KERNELRELEASE
  11
  12 # This part of the Makefile is used when the 'make' command is runned in the
  13 # base directory of the lttng-modules sources. It sets some environment and
  14 # calls the kernel build system to build the actual modules.
  15
  16 KERNELDIR ?= /lib/modules/$(shell uname -r)/build
  17 PWD := $(shell pwd)
  18
  19 # Experimental bitwise enum defaults to disabled.
  20 CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM ?= n
  21
  22 # Emulate Kconfig behavior of setting defines for config options.
  23 LKCPPFLAGS = $(KCPPFLAGS)
  24 ifeq ($(CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM),y)
  25 LKCPPFLAGS += -DCONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM=y
  26 endif
  27
  28 default: modules
  29
  30 modules:
  31         $(MAKE) -C $(KERNELDIR) M=$(PWD)/src \
  32                 CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m \
  33                 KCPPFLAGS='$(LKCPPFLAGS)' \
  34                 modules
  35
  36 modules_install:
  37         $(MAKE) -C $(KERNELDIR) M=$(PWD)/src \
  38                 CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m \
  39                 KCPPFLAGS='$(LKCPPFLAGS)' \
  40                 modules_install
  41
  42 clean:
  43         $(MAKE) -C $(KERNELDIR) M=$(PWD)/src clean
  44
  45 # The following targets are used for development and debugging. They are not
  46 # part of the build system.
  47 %.i: %.c
  48         $(MAKE) -C $(KERNELDIR) M=$(PWD) \
  49                 CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m \
  50                 KCPPFLAGS='$(LKCPPFLAGS)' \
  51                 $@
  52
  53 %.o: %.c
  54         $(MAKE) -C $(KERNELDIR) M=$(PWD) \
  55                 CONFIG_LTTNG=m CONFIG_LTTNG_CLOCK_PLUGIN_TEST=m \
  56                 KCPPFLAGS='$(LKCPPFLAGS)' \
  57                 $@
  58
  59 endif # KERNELRELEASE