Add doxygen build target

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 216 matching lines @@
 
 # Creates symbolic link so that testing is easier. Also runs
 # pnacl-sz to verify that the defines flags have valid values,
 # as well as describe the corresponding build attributes.
 make_symlink: $(OBJDIR)/pnacl-sz
         rm -rf pnacl-sz
         ln -s $(OBJDIR)/pnacl-sz
         @echo "Build Attributes:"
         @$(OBJDIR)/pnacl-sz --build-atts
 
-.PHONY: all make_symlink runtime bloat sb
+.PHONY: all make_symlink runtime bloat sb docs
 
 $(OBJDIR)/pnacl-sz: $(OBJS)
         $(CXX) $(LDFLAGS) -o $@ $^ $(LLVM_LDFLAGS) \
                -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
 
 $(SB_OBJDIR)/pnacl-sz.x86-32.nexe: $(SB_OBJS)
         $(eval PNACL_SZ_BASE := $(patsubst %.nexe, %, $@))
         $(SB_CXX) $(SB_LDFLAGS) -o $(PNACL_SZ_BASE).nonfinal.pexe $^ \
                 $(SB_LLVM_LDFLAGS)
         $(SB_TRANSLATE) -arch x86-32 $(PNACL_SZ_BASE).nonfinal.pexe -o $@ \
@@ skipping 83 matching lines @@
         git diff -U0 `git merge-base HEAD master` | \
         PATH=$(PNACL_BIN_PATH):$(PATH) \
         $(LLVM_SRC_PATH)/../clang/tools/clang-format/clang-format-diff.py \
         -p1 -style=LLVM -i
 
 bloat: make_symlink
         nm -C -S -l pnacl-sz | \
         bloat/bloat.py --nm-output=/dev/stdin syms > build/pnacl-sz.bloat.json
         @echo See Subzero size breakdown in bloat/pnacl-sz.bloat.html
 
+docs:

[Jim Stichnoth, 2015/06/26 00:56:18]

Seems like this should still depend on the Doxyfile?  (not a big deal either
way)

[ascull, 2015/06/29 17:05:11]

As it is a PHONY target it is always out of date so dependencies don't make a
difference. It would be better to have proper dependencies but I couldn't get
that to work properly for doxygen.

+        doxygen Doxyfile
+        @echo See file://`pwd`/docs/html/index.html
+
 clean:
         rm -rf pnacl-sz *.o $(OBJDIR) $(SB_OBJDIR) build/pnacl-sz.bloat.json
 
 clean-all: clean
-        rm -rf build/
+        rm -rf build/ docs/