ifneq ($(RT_PATCH_VERSION), 0)
ccflags-y += -DRT_PATCH_VERSION=$(RT_PATCH_VERSION)
endif
+
+# Starting with kernel 4.12, the ftrace header was moved to private headers
+# and as such is not available when building against distro headers instead
+# of the full kernel sources. In the situation, define LTTNG_FTRACE_MISSING_HEADER
+# so we can enable the compat code even if CONFIG_DYNAMIC_FTRACE is enabled.
+ifneq ($(CONFIG_DYNAMIC_FTRACE),)
+ ftrace_dep = $(srctree)/kernel/trace/trace.h
+ ftrace_dep_check = $(wildcard $(ftrace_dep))
+ have_ftrace_header = $(shell \
+ if [ $(VERSION) -ge 5 -o \( $(VERSION) -eq 4 -a $(PATCHLEVEL) -ge 12 \) ] ; then \
+ if [ -z "$(ftrace_dep_check)" ] ; then \
+ echo "no" ; \
+ exit ; \
+ fi; \
+ fi; \
+ echo "yes" ; \
+ )
+ ifeq ($(have_ftrace_header), no)
+ ccflags-y += -DLTTNG_FTRACE_MISSING_HEADER
+ endif
+endif