Ubuntu16.04 openJDK 8

Question

Ubuntu16.04 openJDK 8编译问题

bash ./configure --with-debug-level=slowdebug
执行结束后

A new configuration has been successfully created in
/home/lzw/Documents/jvm/openjdk/build/linux-x86_64-normal-server-slowdebug
using configure arguments '--with-debug-level=slowdebug'.

Configuration summary:
* Debug level:    slowdebug
* JDK variant:    normal
* JVM variants:   server
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64

Tools summary:
* Boot JDK:       java version "1.7.0_95" OpenJDK Runtime Environment (IcedTea 2.6.4) (7u95-2.6.4-3) OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)  (at /usr/lib/jvm/java-7-openjdk-amd64)
* C Compiler:     gcc-5 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 version 20160609 (at /usr/bin/gcc-5)
* C++ Compiler:   g++-5 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 version 20160609 (at /usr/bin/g++-5)

Build performance summary:
* Cores to use:   4
* Memory limit:   5966 MB
* ccache status:  installed, but disabled (version older than 3.1.4)

然后
make
出现

make: Nothing to be done for 'default'.

搜索了之后
发现问题应该Makefile文件tab缩进的问题
但是openjdk的Makefile文件着实有点复杂，不知从何下手。希望有经验的同学能指点一下

Makefile

#
# Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 only, as
# published by the Free Software Foundation.  Oracle designates this
# particular file as subject to the "Classpath" exception as provided
# by Oracle in the LICENSE file that accompanied this code.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# version 2 for more details (a copy is included in the LICENSE file that
# accompanied this code).
#
# You should have received a copy of the GNU General Public License version
# 2 along with this work; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
# or visit www.oracle.com if you need additional information or have any
# questions.
#

# This must be the first rule
default:

# Inclusion of this pseudo-target will cause make to execute this file
# serially, regardless of -j. Recursively called makefiles will not be
# affected, however. This is required for correct dependency management.
.NOTPARALLEL:

# The shell code below will be executed on /usr/ccs/bin/make on Solaris, but not in GNU make.
# /usr/ccs/bin/make lacks basically every other flow control mechanism.
TEST_FOR_NON_GNUMAKE:sh=echo You are not using GNU make/gmake, this is a requirement. Check your path. 1>&2 && exit 1

# Assume we have GNU make, but check version.
ifeq ($(strip $(foreach v, 3.81% 3.82% 4.%, $(filter $v, $(MAKE_VERSION)))), )
  $(error This version of GNU Make is too low ($(MAKE_VERSION)). Check your path, or upgrade to 3.81 or newer.)
endif

# Locate this Makefile
ifeq ($(filter /%,$(lastword $(MAKEFILE_LIST))),)
  makefile_path:=$(CURDIR)/$(lastword $(MAKEFILE_LIST))
else
  makefile_path:=$(lastword $(MAKEFILE_LIST))
endif
root_dir:=$(dir $(makefile_path))

# ... and then we can include our helper functions
include $(root_dir)/make/MakeHelpers.gmk

$(eval $(call ParseLogLevel))
$(eval $(call ParseConfAndSpec))

# Now determine if we have zero, one or several configurations to build.
ifeq ($(SPEC),)
  # Since we got past ParseConfAndSpec, we must be building a global target. Do nothing.
else
  ifeq ($(words $(SPEC)),1)
    # We are building a single configuration. This is the normal case. Execute the Main.gmk file.
    include $(root_dir)/make/Main.gmk
  else
    # We are building multiple configurations.
    # First, find out the valid targets
    # Run the makefile with an arbitrary SPEC using -p -q (quiet dry-run and dump rules) to find
    # available PHONY targets. Use this list as valid targets to pass on to the repeated calls.
    all_phony_targets=$(filter-out $(global_targets) bundles bundles-only final-images-only, $(strip $(shell \
        cd $(root_dir) && $(MAKE) -p -q FRC SPEC=$(firstword $(SPEC)) | \
        grep ^.PHONY: | head -n 1 | cut -d " " -f 2-)))

    $(all_phony_targets):
    @$(foreach spec,$(SPEC),(cd $(root_dir) && $(MAKE) SPEC=$(spec) \
        $(VERBOSE) VERBOSE=$(VERBOSE) LOG_LEVEL=$(LOG_LEVEL) $@) &&) true

    .PHONY: $(all_phony_targets)

  endif
endif

# Include this after a potential spec file has been included so that the bundles target
# has access to the spec variables.
include $(root_dir)/make/Jprt.gmk

# Here are "global" targets, i.e. targets that can be executed without specifying a single configuration.
# If you addd more global targets, please update the variable global_targets in MakeHelpers.

help:
    $(info )
    $(info OpenJDK Makefile help)
    $(info =====================)
    $(info )
    $(info Common make targets)
    $(info .  make [default]         # Compile all product in langtools, hotspot, jaxp, jaxws,)
    $(info .                         # corba and jdk)
    $(info .  make all               # Compile everything, all repos and images)
    $(info .  make images            # Create complete j2sdk and j2re images)
    $(info .  make docs              # Create javadocs)
    $(info .  make overlay-images    # Create limited images for sparc 64 bit platforms)
    $(info .  make profiles          # Create complete j2re compact profile images)
    $(info .  make bootcycle-images  # Build images twice, second time with newly build JDK)
    $(info .  make install           # Install the generated images locally)
    $(info .  make clean             # Remove all files generated by make, but not those)
    $(info .                         # generated by configure)
    $(info .  make dist-clean        # Remove all files, including configuration)
    $(info .  make help              # Give some help on using make)
    $(info .  make test              # Run tests, default is all tests (see TEST below))
    $(info )
    $(info Targets for specific components)
    $(info (Component is any of langtools, corba, jaxp, jaxws, hotspot, jdk, nashorn, images, overlay-images, docs or test))
    $(info .  make <component>       # Build <component> and everything it depends on. )
    $(info .  make <component>-only  # Build <component> only, without dependencies. This)
    $(info .                         # is faster but can result in incorrect build results!)
    $(info .  make clean-<component> # Remove files generated by make for <component>)
    $(info )
    $(info Useful make variables)
    $(info .  make CONF=             # Build all configurations (note, assignment is empty))
    $(info .  make CONF=<substring>  # Build the configuration(s) with a name matching)
    $(info .                         # <substring>)
    $(info )
    $(info .  make LOG=<loglevel>    # Change the log level from warn to <loglevel>)
    $(info .                         # Available log levels are:)
    $(info .                         # 'warn' (default), 'info', 'debug' and 'trace')
    $(info .                         # To see executed command lines, use LOG=debug)
    $(info )
    $(info .  make JOBS=<n>          # Run <n> parallel make jobs)
    $(info .                         # Note that -jN does not work as expected!)
    $(info )
    $(info .  make test TEST=<test>  # Only run the given test or tests, e.g.)
    $(info .                         # make test TEST="jdk_lang jdk_net")
    $(info )

.PHONY: help