[PATCH] trace-cmd: Add meson build targets to Makefile

[Steven Rostedt <rostedt@goodmis.org>]

From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

Add make targets for building with meson:

  make meson
  make meson_install
  make meson_docs

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 Makefile       | 14 +++++++++++++-
 Makefile.meson | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 Makefile.meson

diff --git a/Makefile b/Makefile
index 6a30eaf0a330..897c972ff9b7 100644
--- a/Makefile
+++ b/Makefile
@@ -527,7 +527,7 @@ install_doc:
 check_doc: force
 	$(Q)$(src)/check-manpages.sh $(src)/Documentation/libtracecmd
 
-clean:
+clean: clean_meson
 	$(RM) *.o *~ *.a *.so .*.d
 	$(RM) tags TAGS cscope* $(PKG_CONFIG_SOURCE_FILE) $(VERSION_FILE)
 	$(MAKE) -C $(src)/lib/trace-cmd clean
@@ -598,6 +598,18 @@ ctracecmd.so: force $(LIBTRACECMD_STATIC)
 PHONY += python
 python: $(PYTHON)
 
+meson:
+	$(MAKE) -f Makefile.meson
+
+meson_install:
+	$(MAKE) -f Makefile.meson install
+
+meson_docs:
+	$(MAKE) -f Makefile.meson docs
+
+PHONY += clean_meson
+clean_meson:
+	$(Q)$(MAKE) -f Makefile.meson $@
 
 dist:
 	git archive --format=tar --prefix=trace-cmd-$(TRACECMD_VERSION)/ HEAD \
diff --git a/Makefile.meson b/Makefile.meson
new file mode 100644
index 000000000000..71d6bf36c654
--- /dev/null
+++ b/Makefile.meson
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0
+
+undefine CFLAGS
+
+# Makefiles suck: This macro sets a default value of $(2) for the
+# variable named by $(1), unless the variable has been set by
+# environment or command line. This is necessary for CC and AR
+# because make sets default values, so the simpler ?= approach
+# won't work as expected.
+define allow-override
+  $(if $(or $(findstring environment,$(origin $(1))),\
+            $(findstring command line,$(origin $(1)))),,\
+    $(eval $(1) = $(2)))
+endef
+
+$(call allow-override,MESON,meson)
+$(call allow-override,MESON_BUILD_DIR,build)
+
+
+all: compile
+
+PHONY += compile
+compile: $(MESON_BUILD_DIR) force
+	$(MESON) compile -C $(MESON_BUILD_DIR)
+
+$(MESON_BUILD_DIR):
+	$(MESON) setup --prefix=$(prefix) $(MESON_BUILD_DIR)
+
+install: compile
+	$(MESON) install -C $(MESON_BUILD_DIR)
+
+docs: $(MESON_BUILD_DIR)
+	$(MESON) compile -C build docs
+
+PHONY += clean_meson
+clean_meson:
+	$(Q)$(RM) -rf $(MESON_BUILD_DIR)
+
+PHONY += force
+force:
-- 
2.43.0