[makefile] Do not silence doxygen warnings

Doxygen is noisy and can't be asked to be less verbose, but
hiding all output from it to a log file hides any real issues
it is facing.

Redirect only stdout which is where doxygen writes progress
noise, let warnings and such output to stderr stay visible.

Also follow makefile conventions by adding standard make
targets and using DESTDIR macro only in install rule.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Makefile

@@ -5,38 +5,68 @@
 # Author: David Weinehall <david.weinehall@nokia.com>
 # Modified by: Ilya Dogolazky, Tuomo Tanskanen
 
-INSTALL_DIR := install -d
+# ----------------------------------------------------------------------------
+# TOP LEVEL TARGETS
+# ----------------------------------------------------------------------------
+
+.PHONY: build doc install clean distclean mostlyclean
+
+build::
+
+doc::
+
+install::
+
+mostlyclean::
+	$(RM) *.bak *~
+	$(RM) mce/include/*.bak mce/include/*~
+
+clean:: mostlyclean
+
+distclean:: clean
+
+# ----------------------------------------------------------------------------
+# INSTALL CONFIG
+# ----------------------------------------------------------------------------
+
+DESTDIR    ?= /tmp/test-mce-dev
+
+PCDIR      := /usr/lib/pkgconfig
+INCLUDEDIR := /usr/include/mce
+
+INSTALL_DIR  := install --mode=755 --directory
 INSTALL_DATA := install --mode=644
 
-DOXYGEN := doxygen
 
-PCDIR := $(DESTDIR)/usr/lib/pkgconfig
-INCLUDEDIR := $(DESTDIR)/usr/include/mce
+# ----------------------------------------------------------------------------
+# FILES TO BUILD / INSTALL
+# ----------------------------------------------------------------------------
 
-TOPDIR := $(shell /bin/pwd)
-INCDIR := $(TOPDIR)/include/mce
-DOCDIR := $(TOPDIR)/doc
+PCFILE  += mce.pc
+INCLUDE_FILES += include/mce/dbus-names.h
+INCLUDE_FILES += include/mce/mode-names.h
 
-PCFILE  := mce.pc
-INCLUDE_FILES := $(INCDIR)/dbus-names.h $(INCDIR)/mode-names.h
+# ----------------------------------------------------------------------------
+# DOCUMENTATION RULES
+# ----------------------------------------------------------------------------
 
-.PHONY: doc
-doc:	doc/warnings
+doc::	doc/doxygen.log
 
-doc/warnings: $(INCLUDE_FILES) Doxyfile
-	@if [ ! -d "$(DOCDIR)" ]; then mkdir "$(DOCDIR)"; fi
-	@$(DOXYGEN) 2> $(TOPDIR)/doc/warnings > /dev/null
+doc/doxygen.log: $(INCLUDE_FILES) Doxyfile
+	mkdir -p doc
+	doxygen 1> $@ # stdout=noise stderr=warnings
 
-clean:
-	@if [ x"$(DOCDIR)" != x"" ]; then	\
-		rm -rf "$(DOCDIR)";		\
-	fi
+clean::
+	$(RM) -rf doc
 
-.PHONY: install
-install: doc
-	$(INSTALL_DIR) $(PCDIR) $(INCLUDEDIR)				&&\
-	$(INSTALL_DATA) $(PCFILE) $(PCDIR)				&&\
-	$(INSTALL_DATA) $(INCLUDE_FILES) $(INCLUDEDIR)
+# ----------------------------------------------------------------------------
+# INSTALL RULES
+# ----------------------------------------------------------------------------
 
-.PHONY: distclean
-distclean: clean
+install::
+	# package config files
+	$(INSTALL_DIR) $(DESTDIR)$(PCDIR)
+	$(INSTALL_DATA) $(PCFILE) $(DESTDIR)$(PCDIR)/
+	# header files
+	$(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)
+	$(INSTALL_DATA) $(INCLUDE_FILES) $(DESTDIR)$(INCLUDEDIR)