Fix: build against out-of-tree kernel build

[lttng-modules.git] / Makefile

#
# Makefile for the LTT objects.
#

ifneq ($(KERNELRELEASE),)

  # This part of the Makefile is used when called by the kernel build system
  # and defines the modules to be built.

  ifneq ($(CONFIG_TRACEPOINTS),)

    TOP_LTTNG_MODULES_DIR := $(shell dirname $(lastword $(MAKEFILE_LIST)))

    lttng_check_linux_version = $(shell pwd)/include/linux/version.h
    lttng_check_generated_linux_version = $(shell pwd)/include/generated/uapi/linux/version.h

    #
    # Check for stale version.h, which can be a leftover from an old Linux
    # kernel tree moved to a newer kernel version, only pruned by make
    # distclean.
    #
    ifneq ($(wildcard $(lttng_check_linux_version)),)
      ifneq ($(wildcard $(lttng_check_generated_linux_version)),)
        $(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)
      endif
    endif

    include $(TOP_LTTNG_MODULES_DIR)/Makefile.ABI.workarounds

    ccflags-y += -I$(TOP_LTTNG_MODULES_DIR)

    obj-$(CONFIG_LTTNG) += lttng-ring-buffer-client-discard.o
    obj-$(CONFIG_LTTNG) += lttng-ring-buffer-client-overwrite.o
    obj-$(CONFIG_LTTNG) += lttng-ring-buffer-metadata-client.o
    obj-$(CONFIG_LTTNG) += lttng-ring-buffer-client-mmap-discard.o
    obj-$(CONFIG_LTTNG) += lttng-ring-buffer-client-mmap-overwrite.o
    obj-$(CONFIG_LTTNG) += lttng-ring-buffer-metadata-mmap-client.o
    obj-$(CONFIG_LTTNG) += lttng-clock.o

    obj-$(CONFIG_LTTNG) += lttng-tracer.o

    lttng-tracer-objs := lttng-events.o lttng-abi.o \
                         lttng-probes.o lttng-context.o \
                         lttng-context-pid.o lttng-context-procname.o \
                         lttng-context-prio.o lttng-context-nice.o \
                         lttng-context-vpid.o lttng-context-tid.o \
                         lttng-context-vtid.o lttng-context-ppid.o \
                         lttng-context-vppid.o lttng-context-cpu-id.o \
                         lttng-context-interruptible.o \
                         lttng-context-need-reschedule.o lttng-calibrate.o \
                         lttng-context-hostname.o wrapper/random.o \
                         probes/lttng.o wrapper/trace-clock.o \
                         wrapper/page_alloc.o \
                         lttng-tracker-pid.o \
                         lttng-filter.o lttng-filter-interpreter.o \
                         lttng-filter-specialize.o \
                         lttng-filter-validator.o \
                         probes/lttng-probe-user.o

    ifneq ($(CONFIG_HAVE_SYSCALL_TRACEPOINTS),)
      lttng-tracer-objs += lttng-syscalls.o
    endif # CONFIG_HAVE_SYSCALL_TRACEPOINTS

    ifneq ($(CONFIG_PERF_EVENTS),)
      lttng-tracer-objs += $(shell \
        if [ $(VERSION) -ge 3 \
          -o \( $(VERSION) -eq 2 -a $(PATCHLEVEL) -ge 6 -a $(SUBLEVEL) -ge 33 \) ] ; then \
          echo "lttng-context-perf-counters.o" ; fi;)
    endif # CONFIG_PERF_EVENTS

    ifneq ($(CONFIG_PREEMPT_RT_FULL),)
      lttng-tracer-objs += lttng-context-migratable.o
      lttng-tracer-objs += lttng-context-preemptible.o
    endif # CONFIG_PREEMPT_RT_FULL

    ifneq ($(CONFIG_PREEMPT),)
      lttng-tracer-objs += lttng-context-preemptible.o
    endif

    lttng-tracer-objs += $(shell \
      if [ $(VERSION) -ge 4 \
        -o \( $(VERSION) -eq 3 -a $(PATCHLEVEL) -ge 15 -a $(SUBLEVEL) -ge 0 \) ] ; then \
        echo "lttng-tracepoint.o" ; fi;)

    obj-$(CONFIG_LTTNG) += lttng-statedump.o
    lttng-statedump-objs := lttng-statedump-impl.o wrapper/irqdesc.o \
                            wrapper/fdtable.o

    obj-$(CONFIG_LTTNG) += probes/
    obj-$(CONFIG_LTTNG) += lib/

  endif # CONFIG_TRACEPOINTS

else # KERNELRELEASE

# This part of the Makefile is used when the 'make' command is runned in the
# base directory of the lttng-modules sources. It sets some environment and
# calls the kernel build system to build the actual modules.

KERNELDIR ?= /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
CFLAGS = $(EXTCFLAGS)

default:
	$(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_LTTNG=m modules

modules_install:
	$(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_LTTNG=m modules_install

clean:
	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean

%.i: %.c
	$(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_LTTNG=m $@

endif # KERNELRELEASE