Makefile

# We borrow heavily from the kernel build setup, though we are simpler since
# we don't have Kconfig tweaking settings on us.

# The implicit make rules have it looking for RCS files, among other things.
# We instead explicitly write all the rules we care about.
# It's even quicker (saves ~200ms) to pass -r on the command line.
MAKEFLAGS=-r

# The source directory tree.
srcdir := ..
abs_srcdir := $(abspath $(srcdir))

# The name of the builddir.
builddir_name ?= .

# The V=1 flag on command line makes us verbosely print command lines.
ifdef V
  quiet=
else
  quiet=quiet_
endif

# Specify BUILDTYPE=Release on the command line for a release build.
BUILDTYPE ?= Release

# Directory all our build output goes into.
# Note that this must be two directories beneath src/ for unit tests to pass,
# as they reach into the src/ directory for data with relative paths.
builddir ?= $(builddir_name)/$(BUILDTYPE)
abs_builddir := $(abspath $(builddir))
depsdir := $(builddir)/.deps

# Object output directory.
obj := $(builddir)/obj
abs_obj := $(abspath $(obj))

# We build up a list of every single one of the targets so we can slurp in the
# generated dependency rule Makefiles in one pass.
all_deps :=



CC.target ?= $(CC)
CFLAGS.target ?= $(CPPFLAGS) $(CFLAGS)
CXX.target ?= $(CXX)
CXXFLAGS.target ?= $(CPPFLAGS) $(CXXFLAGS)
LINK.target ?= $(LINK)
LDFLAGS.target ?= $(LDFLAGS)
AR.target ?= $(AR)

# C++ apps need to be linked with g++.
LINK ?= $(CXX.target)

# TODO(evan): move all cross-compilation logic to gyp-time so we don't need
# to replicate this environment fallback in make as well.
CC.host ?= gcc
CFLAGS.host ?= $(CPPFLAGS_host) $(CFLAGS_host)
CXX.host ?= g++
CXXFLAGS.host ?= $(CPPFLAGS_host) $(CXXFLAGS_host)
LINK.host ?= $(CXX.host)
LDFLAGS.host ?=
AR.host ?= ar

# Define a dir function that can handle spaces.
# http://www.gnu.org/software/make/manual/make.html#Syntax-of-Functions
# "leading spaces cannot appear in the text of the first argument as written.
# These characters can be put into the argument value by variable substitution."
empty :=
space := $(empty) $(empty)