0x00 编译环境
系统：ubuntu20.04
目标JDK：openjdk7
Bootstrap JDK：Java SE Development Kit 7u4
Ant：apache-ant-1.9.16
Freetype：freetype-2.3.0
gcc/g++版本：gcc-4.9/g++-4.9
0x01 环境配置
安装依赖包
sudo apt-get install build-essential gawk m4 libasound2-dev libcups2-dev libxrender-dev xorg-dev xutils-dev binutils libmotif-dev
安装Freetype
将下载的软件包解压出来，进入根目录
./configure
sudo make
sudo make install
配置环境变量，可以将以下代码保存到一个文件中，使用source命令，source该文件环境变量即设置成功：
#语言选项，这个必须设置，否则编译好后会出现一个HashTable的NPE错
export LANG=C
#Bootstrap JDK的安装路径。必须设置
export ALT_BOOTDIR=/home/sinowrt/Documents/jre1.7.0_04
#允许自动下载依赖
export ALLOW_DOWNLOADS=true
#并行编译的线程数，设置为和CPU内核数量一致即可
export HOTSPOT_BUILD_JOBS=4
export ALT_PARALLEL_COMPILE_JOBS=4
#比较本次build出来的映像与先前版本的差异。这对我们来说没有意义，
#必须设置为false，否则sanity检查会报缺少先前版本JDK的映像的错误提示。
#如果已经设置dev或者DEV_ONLY=true，这个不显式设置也行
export SKIP_COMPARE_IMAGES=true
#使用预编译头文件，不加这个编译会更慢一些
export USE_PRECOMPILED_HEADER=true
#要编译的内容
export BUILD_LANGTOOLS=true
#export BUILD_JAXP=false
#export BUILD_JAXWS=false
#export BUILD_CORBA=false
export BUILD_HOTSPOT=true
export BUILD_JDK=true
#要编译的版本
#export SKIP_DEBUG_BUILD=false
#export SKIP_FASTDEBUG_BUILD=true
#export DEBUG_NAME=debug
#把它设置为false可以避开javaws和浏览器Java插件之类的部分的build
BUILD_DEPLOY=false
#把它设置为false就不会build出安装包。因为安装包里有些奇怪的依赖，
#但即便不build出它也已经能得到完整的JDK映像，所以还是别build它好了
BUILD_INSTALL=false
#这两个环境变量必须去掉，不然会有很诡异的事情发生（我没有具体查过这些"诡异的
#事情"，Makefile脚本检查到有这2个变量就会提示警告）
unset JAVA_HOME
unset CLASSPATH
# ==============【以下是我的个性化环境配置，可以按需设置】====================
#设置freetype路径
export ALT_FREETYPE_HEADERS_PATH=/usr/local/include
export ALT_FREETYPE_LIB_PATH=/usr/local/lib
#设置Ant路径
export PATH=/home/sinowrt/Documents/apache-ant-1.9.16/bin:$PATH
#编译结果所存放的路径
export ALT_OUTPUTDIR=/home/sinowrt/Documents/jdk7u-dev/build
export ANT_HOME=/home/sinowrt/Documents/apache-ant-1.9.16
#取消Hotspot系统支持检查
export DISABLE_HOTSPOT_OS_VERSION_CHECK=false
0x02 编译JDK
可以使用make sanity命令检查前面所做的设置是否正确，如果显示“Sanity check passed”即说明检查过程通过了
然后使用make命令进行编译，但是错了，让我们看看报错信息：
g++ -DLINUX -D_GNU_SOURCE -DAMD64 -DPRODUCT -I. -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/prims -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/cpu/x86/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os_cpu/linux_x86/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/posix/vm -I../generated -DHOTSPOT_RELEASE_VERSION="\"24.80-b07\"" -DHOTSPOT_BUILD_TARGET="\"product\"" -DHOTSPOT_BUILD_USER="\"sinowrt\"" -DHOTSPOT_LIB_ARCH=\"amd64\" -DHOTSPOT_VM_DISTRO="\"OpenJDK\"" -DTARGET_OS_FAMILY_linux -DTARGET_ARCH_x86 -DTARGET_ARCH_MODEL_x86_64 -DTARGET_OS_ARCH_linux_x86 -DTARGET_OS_ARCH_MODEL_linux_x86_64 -DTARGET_COMPILER_gcc -DCOMPILER2 -DCOMPILER1 -fPIC -fno-rtti -fno-exceptions -D_REENTRANT -fcheck-new -fvisibility=hidden -m64 -pipe -O3 -fno-strict-aliasing -g -DVM_LITTLE_ENDIAN -D_LP64=1 -fno-omit-frame-pointer -DINCLUDE_TRACE=1 -Werror -Wpointer-arith -Wsign-compare -c -fpch-deps -MMD -MP -MF ../generated/dependencies/precompiled.hpp.gch.d -x c++-header /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp -o precompiled.hpp.gch
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/sharedHeap.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp:34,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/gc_implementation/shared/markSweep.inline.hpp:32,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/oop.inline.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classFileParser.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classLoader.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/systemDictionary.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciEnv.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciUtilities.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciNullObject.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciConstant.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:36:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/generation.hpp:422:17: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
422 | warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, _time_of_last_gc, now);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/generation.hpp:422:42: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
422 | warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, _time_of_last_gc, now);
| ^
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/oop.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classFileParser.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classLoader.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/systemDictionary.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciEnv.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciUtilities.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciNullObject.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciConstant.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:36:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/threadLocalAllocBuffer.inline.hpp:97:25: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
97 | gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]"
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/threadLocalAllocBuffer.inline.hpp:98:25: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
98 | " obj: "SIZE_FORMAT
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/threadLocalAllocBuffer.inline.hpp:99:25: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
99 | " free: "SIZE_FORMAT
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/threadLocalAllocBuffer.inline.hpp💯25: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
100 | " waste: "SIZE_FORMAT"\n",
| ^
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/space.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/space.inline.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/gc_implementation/shared/cSpaceCounters.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/defNewGeneration.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/services/memoryPool.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/services/lowMemoryDetector.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp:36,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/oop.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classFileParser.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classLoader.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/systemDictionary.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciEnv.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciUtilities.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciNullObject.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciConstant.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:36:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:156:20: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
156 | err_msg("Attempt to access p = "PTR_FORMAT" out of bounds of "
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:157:20: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
157 | " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:157:69: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
157 | " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:432:20: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
432 | err_msg("Returning result = "PTR_FORMAT" out of bounds of "
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:433:20: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
433 | " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:433:69: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
433 | " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:441:20: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
441 | err_msg("Attempt to access p = "PTR_FORMAT" out of bounds of "
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:442:20: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
442 | " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/cardTableModRefBS.hpp:442:69: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
442 | " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
| ^
In file included from ../generated/tracefiles/traceEventClasses.hpp:18,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/tracing.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/opto/compile.hpp:44,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/opto/node.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/opto/addnode.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:259:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:44:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
44 | _st.print("%s = "UINT32_FORMAT, label, val);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:48:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
48 | _st.print("%s = "UINT32_FORMAT, label, val);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:52:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
52 | _st.print("%s = "INT32_FORMAT, label, val);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:56:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
56 | _st.print("%s = "UINT32_FORMAT, label, val);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:60:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
60 | _st.print("%s = "INT32_FORMAT, label, val);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:64:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
64 | _st.print("%s = "UINT64_FORMAT, label, val);
| ^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/trace/traceStream.hpp:68:15: error: invalid suffix on literal; C++11 requires a space between literal and string macro [-Werror=literal-suffix]
68 | _st.print("%s = "INT64_FORMAT, label, val);
| ^
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:29:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/relocInfo.hpp:374:27: error: friend declaration of 'relocInfo prefix_relocInfo(int)' specifies default arguments and isn't a definition [-fpermissive]
374 | inline friend relocInfo prefix_relocInfo(int datalen = 0);
| ^~~~~~~~~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:29:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/relocInfo.hpp:469:18: error: friend declaration of 'relocInfo prefix_relocInfo(int)' specifies default arguments and isn't the only declaration [-fpermissive]
469 | inline relocInfo prefix_relocInfo(int datalen) {
| ^~~~~~~~~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:29:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/relocInfo.hpp:374:27: note: previous declaration of 'relocInfo prefix_relocInfo(int)'
374 | inline friend relocInfo prefix_relocInfo(int datalen = 0);
| ^~~~~~~~~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/compiler/disassembler.hpp:31,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:30:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp: In static member function 'static dirent* os::readdir(DIR*, dirent*)':
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp:154:18: error: 'int readdir_r(DIR*, dirent*, dirent**)' is deprecated [-Werror=deprecated-declarations]
154 | if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
| ^~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/jvm_linux.h:44,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/prims/jvm.h:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/utilities/debug.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/globals.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/allocation.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/iterator.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/genOopClosures.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/klass.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/handles.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/oopRecorder.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:29:
/usr/include/dirent.h:183:12: note: declared here
183 | extern int readdir_r (DIR *__restrict __dirp,
| ^~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/compiler/disassembler.hpp:31,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:30:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp:154:42: error: 'int readdir_r(DIR*, dirent*, dirent**)' is deprecated [-Werror=deprecated-declarations]
154 | if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
| ^
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/jvm_linux.h:44,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/prims/jvm.h:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/utilities/debug.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/globals.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/allocation.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/iterator.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/genOopClosures.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/klass.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/handles.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/oopRecorder.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:29:
/usr/include/dirent.h:183:12: note: declared here
183 | extern int readdir_r (DIR *__restrict __dirp,
| ^~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/compiler/disassembler.hpp:31,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:30:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp:154:42: error: 'int readdir_r(DIR*, dirent*, dirent**)' is deprecated [-Werror=deprecated-declarations]
154 | if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
| ^
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/jvm_linux.h:44,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/prims/jvm.h:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/utilities/debug.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/globals.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/allocation.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/iterator.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/genOopClosures.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/klass.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/handles.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/oopRecorder.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:29:
/usr/include/dirent.h:183:12: note: declared here
183 | extern int readdir_r (DIR *__restrict __dirp,
| ^~~~~~~~~
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/constantPoolOop.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/methodOop.hpp:33,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/frame.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/prims/jvmtiExport.hpp:33,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/runtime/thread.hpp:32,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/thread_linux.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/memory/resourceArea.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classFileParser.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/classLoader.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/classfile/systemDictionary.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciEnv.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciUtilities.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciNullObject.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciConstant.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:36:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/cpCacheOop.hpp: At global scope:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/cpCacheOop.hpp:189:42: error: left operand of shift expression '(-1 << 28)' is negative [-fpermissive]
189 | option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
| ~~~~~~^~~~~~~~~~~~~~~~~~~
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/oops/cpCacheOop.hpp:189:104: error: enumerator value for 'option_bits_mask' is not an integer constant
189 | option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
| ^
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciEnv.hpp:32,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciUtilities.hpp:28,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciNullObject.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/ci/ciConstant.hpp:29,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:36:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/dependencies.hpp:169:59: error: left operand of shift expression '(-1 << 1)' is negative [-fpermissive]
169 | all_types = ((1 << TYPE_LIMIT) - 1) & ((-1) << FIRST_TYPE),
| ~~~~~~^~~~~~~~~~~~~~
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/code/dependencies.hpp:169:72: error: enumerator value for 'all_types' is not an integer constant
169 | all_types = ((1 << TYPE_LIMIT) - 1) & ((-1) << FIRST_TYPE),
| ^
cc1plus: all warnings being treated as errors
make[6]: *** [/home/sinowrt/Documents/jdk7u-dev/hotspot/make/linux/makefiles/vm.make:296: precompiled.hpp.gch] Error 1
make[6]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/build/hotspot/outputdir/linux_amd64_compiler2/product'
make[5]: *** [/home/sinowrt/Documents/jdk7u-dev/hotspot/make/linux/makefiles/top.make:119: the_vm] Error 2
make[5]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/build/hotspot/outputdir/linux_amd64_compiler2/product'
make[4]: *** [/home/sinowrt/Documents/jdk7u-dev/hotspot/make/linux/Makefile:290: product] Error 2
make[4]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/build/hotspot/outputdir'
make[3]: *** [Makefile:192: generic_build2] Error 2
make[3]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/hotspot/make'
make[2]: *** [Makefile:151: product] Error 2
make[2]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/hotspot/make'
make[1]: *** [make/hotspot-rules.gmk:114: hotspot-build] Error 2
make[1]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev'
make: *** [Makefile:251: build_product_image] Error 2
这个问题是因为安装依赖包时，默认安装了高版本的gcc和g++，可使用gcc -v或g++ -v命令查看版本，需要安装低版本的gcc/g++
sinowrt@ubuntu:~/Documents/jdk7u-dev$ gcc -v
#省略若干行...
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
sinowrt@ubuntu:~/Documents/jdk7u-dev$ g++ -v
#省略若干行...
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
我选择安装4.9版本的gcc与g++
而ubuntu20.04中sudo apt-get install gcc-4.9会提示找不到安装包，需要添加低版本的源，这里我添加的是ubuntu16的aliyun源
sudo vi /etc/apt/source.list
#在文件最后面添加源信息,`:wq`保存退出
#源===========================【Start】=============================
deb http://mirrors.aliyun.com/ubuntu/ xenial main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe
#源===========================【E n d】=============================
#更新源
sudo apt-get update
#安装gcc-4.9 g++-4.9
sudo apt-get install gcc-4.9 g++-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 40
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 50
sudo update-alternatives --config gcc
#sinowrt@ubuntu:~/Documents/jdk7u-dev$ sudo update-alternatives --config gcc
#There are 2 choices for the alternative gcc (providing /usr/bin/gcc)
#
# Selection Path Priority Status
#------------------------------------------------------------
#* 0 /usr/bin/gcc-9 50 auto mode
# 1 /usr/bin/gcc-4.9 40 manual mode
# 2 /usr/bin/gcc-9 50 manual mode
#Press <enter> to keep the current choice[*], or type selection number:
#根据提示，输入数字1，选择当前使用的gcc为gcc-4.9
#g++的配置也一样，此处略
切换到低版本的gcc和g++后，make clean重新make，虽然还是会报error，但是只是warning输出为error，如下面输出所示
g++ -DLINUX -D_GNU_SOURCE -DAMD64 -DPRODUCT -I. -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/prims -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/cpu/x86/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os_cpu/linux_x86/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm -I/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/posix/vm -I../generated -DHOTSPOT_RELEASE_VERSION="\"24.80-b07\"" -DHOTSPOT_BUILD_TARGET="\"product\"" -DHOTSPOT_BUILD_USER="\"sinowrt\"" -DHOTSPOT_LIB_ARCH=\"amd64\" -DHOTSPOT_VM_DISTRO="\"OpenJDK\"" -DTARGET_OS_FAMILY_linux -DTARGET_ARCH_x86 -DTARGET_ARCH_MODEL_x86_64 -DTARGET_OS_ARCH_linux_x86 -DTARGET_OS_ARCH_MODEL_linux_x86_64 -DTARGET_COMPILER_gcc -DCOMPILER2 -DCOMPILER1 -fPIC -fno-rtti -fno-exceptions -D_REENTRANT -fcheck-new -fvisibility=hidden -m64 -pipe -O3 -fno-strict-aliasing -g -DVM_LITTLE_ENDIAN -D_LP64=1 -fno-omit-frame-pointer -DINCLUDE_TRACE=1 -Werror -Wpointer-arith -Wsign-compare -c -fpch-deps -MMD -MP -MF ../generated/dependencies/precompiled.hpp.gch.d -x c++-header /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp -o precompiled.hpp.gch
In file included from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/compiler/disassembler.hpp:31:0,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/asm/assembler.inline.hpp:30,
from /home/sinowrt/Documents/jdk7u-dev/hotspot/src/share/vm/precompiled/precompiled.hpp:30:
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp: In static member function 'static dirent* os::readdir(DIR*, dirent*)':
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp:154:18: error: 'int readdir_r(DIR*, dirent*, dirent**)' is deprecated (declared at /usr/include/dirent.h:183) [-Werror=deprecated-declarations]
if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
^
/home/sinowrt/Documents/jdk7u-dev/hotspot/src/os/linux/vm/os_linux.inline.hpp:154:42: error: 'int readdir_r(DIR*, dirent*, dirent**)' is deprecated (declared at /usr/include/dirent.h:183) [-Werror=deprecated-declarations]
if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
^
cc1plus: all warnings being treated as errors
make[6]: *** [/home/sinowrt/Documents/jdk7u-dev/hotspot/make/linux/makefiles/vm.make:296: precompiled.hpp.gch] Error 1
make[6]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/build/hotspot/outputdir/linux_amd64_compiler2/product'
make[5]: *** [/home/sinowrt/Documents/jdk7u-dev/hotspot/make/linux/makefiles/top.make:119: the_vm] Error 2
make[5]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/build/hotspot/outputdir/linux_amd64_compiler2/product'
make[4]: *** [/home/sinowrt/Documents/jdk7u-dev/hotspot/make/linux/Makefile:290: product] Error 2
make[4]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/build/hotspot/outputdir'
make[3]: *** [Makefile:192: generic_build2] Error 2
make[3]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/hotspot/make'
make[2]: *** [Makefile:151: product] Error 2
make[2]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev/hotspot/make'
make[1]: *** [make/hotspot-rules.gmk:114: hotspot-build] Error 2
make[1]: Leaving directory '/home/sinowrt/Documents/jdk7u-dev'
make: *** [Makefile:251: build_product_image] Error 2
出现这些错误是因为编译的时候，添加了-Werror参数，只要将-Werror参数去掉即可
vi hotspot/make/linux/makefiles/gcc.make
#找到WARNINGS_ARE_ERRORS = -Werror整行注释掉
:wq保存退出之后，make clean再重新make即可成功编译，整个编译过程有点久，耐心等待即可。
编译成功会出现如下提示：
########################################################################
##### Leaving jdk for target(s) sanity all docs images #####
########################################################################
##### Build time 00:05:21 jdk for target(s) sanity all docs images #####
########################################################################
#-- Build times ----------
Target all_product_build
Start 2022-04-19 06:55:27
End 2022-04-19 07:05:10
00:00:59 corba
00:02:51 hotspot
00:00:08 jaxp
00:00:10 jaxws
00:05:21 jdk
00:00:14 langtools
00:09:43 TOTAL
-------------------------
0x03 总结
Ubuntu相对于Mac和Win平台，编译JDK更容易，之前也在MacOS中尝试过编译JDK7，由于Command Line Tools与新版本macOS不兼容而以失败告终，在Ubuntu中软件包的安装更宽松，使得编译环境更容易配置，建议老版本的JDK优先考虑使用Ubuntu进行编译。