experiment/fiddle

experimental/fiddle/Makefile

+# Copyright 2015 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+.PHONEY: all
+all: fiddle
+clean:
+        git clean -fXd
+
+PREFIX ?= $(PWD)/local
+CXX ?= c++
+
+CXXFLAGS += -Wall -Werror --std=c++11

[mtklein, 2015/09/17 13:58:22]

Why do we -Wall -Werror?

+LIBSKIA := libskia.so
+ifeq ($(shell uname), Darwin)
+  LIBSKIA := libskia.dylib
+endif
+
+# These commands also put headers in $(PREFIX)/include/skia.
+$(PREFIX)/lib/$(LIBSKIA):
+        mkdir -p build $(PREFIX)
+        cmake -DCMAKE_INSTALL_PREFIX:PATH="$(PREFIX)" -DSK_MESA:BOOL=1 \
+          -Bbuild -H../../cmake -G Ninja
+        ninja -C build skia
+        ninja -C build install

[mtklein, 2015/09/17 13:58:22]

I'm skeptical of all these different directories and installation.  Why can't
you just build in ../../cmake and use headers from ../../include?

+
+.PHONEY: libskia
+libskia: $(PREFIX)/lib/$(LIBSKIA)
+
+skia.h: headers.sh $(PREFIX)/lib/$(LIBSKIA)
+        sh headers.sh > skia.h
+
+SKIA_INCLUDES := \
+          -I $(PREFIX)/include/skia/core \
+          -I $(PREFIX)/include/skia/gpu \
+          -I $(PREFIX)/include/skia/gpu/gl \
+          -I $(PREFIX)/include/skia/effects \
+          -I $(PREFIX)/include/skia/pathops \
+          -I $(PREFIX)/include/skia/c \
+          -I $(PREFIX)/include/skia/utils
+
+# Precompiled header
+skia.gch: skia.h

[mtklein, 2015/09/17 13:58:22]

Does this cut build times down significantly?

I am skeptical of the added complexity.  I would rather fiddle use Skia's
headers as we and most users use them.

+        $(CXX) $(CXXFLAGS) $(SKIA_INCLUDES) -c $< -o $@
+
+OSMesaContextHolder.o: OSMesaContextHolder.cpp OSMesaContextHolder.h
+        $(CXX) $(CXXFLAGS) -c -o $@ OSMesaContextHolder.cpp
+
+fiddle_main.o: fiddle_main.cpp fiddle_main.h skia.gch OSMesaContextHolder.h
+        $(CXX) $(CXXFLAGS) $(SKIA_INCLUDES) -include skia.h -c -o $@ $<

[mtklein, 2015/09/17 13:58:22]

Don't we need to name it skia.h.gch for this to work?  As written, are you not
just using skia.h directly, making skia.gch moot?

+
+################################################################################
+
+FIDDLE_LD := -lOSMesa -Wl,-rpath -Wl,"$(PREFIX)/lib"

[mtklein, 2015/09/17 13:58:22]

Shouldn't Skia be linked against OSMesa instead?  Or does fiddle need to call
OSMesa things itself too?

+
+FIDDLE_SOURCES := draw.cpp fiddle_main.o OSMesaContextHolder.o $(PREFIX)/lib/$(LIBSKIA)

[mtklein, 2015/09/17 13:58:22]

Why are fiddle_main and OSMesaContextHolder different steps?  Why not just list
the .cpp files here?

+
+fiddle: $(FIDDLE_SOURCES) skia.gch fiddle_main.h
+        $(CXX) $(CXXFLAGS) $(SKIA_INCLUDES) -include skia.h -o $@ $(FIDDLE_SOURCES) $(FIDDLE_LD)

[mtklein, 2015/09/17 13:58:22]

Ditto about skia.h.gch.