em-dosbox

基本知识：
1.emscripten gcc8.2
2.参考：https://blog.csdn.net/martinking1997/article/details/82460849
3.修改过的 https://github.com/killinux/em-dosbox
########## error:
emcc 报错
version `GLIBCXX_3.4.21' not found
strings /usr/lib64/libstdc++.so.6 |grep GLIBCXX

检查C_INCLUDE_PATH and LD_LIBRARY_PATH and PATH
是因为gcc版本太低了，需要gcc8.0

############需要emscripten
https://haoningabc.iteye.com/admin/blogs/2411956

########################    如果有ssl错误：
Error: Downloading URL 'https://storage.googleapis.com/webassembly/emscripten-releases-builds/mac/b024b71038d1291ed7ec23ecd553bf2c0c8d6da6/wasm-binaries.tbz2': <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)>
Warning: Possibly SSL/TLS issue. Update or install Python SSL root certificates (2048-bit or greater) supplied in Python folder or https://pypi.org/project/certifi/ and try again.
Installation failed!

vim emsdk.py
加入
import ssl
ssl._create_default_https_context = ssl._create_unverified_context


######################### 错误 expected unqualified-id
make em-dosbox的时候会报错
这个在mac下没解决。。。。。 2019年12月5日解决
大量error：
version:1:1: error: expected unqualified-id
参考
https://github.com/nmap/nmap/issues/1586

/usr/local/Cellar/emscripten/1.38.44/libexec/system/include/libcxx/cstddef
/usr/local/Cellar/emscripten/1.38.44/libexec/system/include/libcxx/type_traits
<version> to "version"
这样要改n个文件，不可取
搜索VERSION em-dosbox官方有个VERSION文件和emcc要用的<version>冲突了

把em-dosbox根目录的VERSION 删掉就好了





########### redhat8  上安装没有 libgcc的问题
export LANGUAGE="en_US.UTF-8"
export LANG=en_US:zh_CN.UTF-8
export LC_ALL=C

yum install autoconf automake cmake -y 
yum install python3 -y
ln -s /usr/bin/python3 /usr/bin/python

注意需要用cmake3  卸载cmake2

########### centos  7 完整实验：
因为emcc需要的libstdc++.so 要比较高的版本，默认的4.8不行，
先装gcc8.2，
设置 LD_LIBRARY_PATH

再使用emsdk
参考：
https://blog.csdn.net/martinking1997/article/details/82460849
不用https://blog.cles.jp/item/9428

gcc 要用8
下载：http://ftp.gnu.org/gnu/gcc/gcc-8.2.0/

需要cmake3
必要包的安装：

yum install -y epel-release
yum install -y cmake3 nodejs npm java-1.8.0-openjdk java-1.8.0-openjdk-devel git
ln -s /usr/bin/cmake3 /usr/local/bin/cmake
yum install autoconf automake -y

yum install  -y gmp  gmp-devel  mpfr  mpfr-devel  libmpc  libmpc-devel
yum install zlib zlib-devel pcre pcre-devel -y
yum install gcc-c++ glibc-headers -y
yum remove gcc 

这样容易看出gcc的错误

安装gcc8.2:

./configure --with-system-zlib --disable-multilib --enable-languages=c,c++,fortran   --prefix=/usr/local/gcc8
make -j4
make install

检查
strings /usr/local/gcc8/lib64/libstdc++.so|grep GLIBCXX

export LD_LIBRARY_PATH=/usr/local/gcc8/lib64:$LD_LIBRARY_PATH

先删除本机的gcc方便调试
yum remove gcc

安装em-dosbox

后设置环境变量：

export GCC_HOME=/usr/local/gcc8
export PATH=$GCC_HOME/bin:$PATH

export MANPATH=$GCC_HOME/share/man
export CPATH=$GCC_HOME/include
export C_INCLUDE_DIRS=$GCC_HOME/include
export LD_LIBRARY_PATH=$GCC_HOME/lib:$GCC_HOME/lib64
export LIBRARY_PATH=$GCC_HOME/lib:$GCC_HOME/lib64

安装参考：
http://www.ruanyifeng.com/blog/2017/09/asmjs_emscripten.html
https://blog.csdn.net/martinking1997/article/details/82460849

这个最重要
安装emscripten：

git clone https://github.com/juj/emsdk.git
cd emsdk
./emsdk install --build=Release sdk-incoming-64bit binaryen-master-64bit
./emsdk activate --build=Release sdk-incoming-64bit binaryen-master-64bit
source ./emsdk_env.sh --build=Release

##########在安装clang的时候
The CXX compiler identification is unknown
需要在 emsdk/clang/fastcomp/src

里面加

set(CMAKE_C_COMPILER "/usr/local/gcc8/bin/gcc")
set(CMAKE_CXX_COMPILER "/usr/local/gcc8/bin/g++")

删除emsdk/clang/fastcomp 编译过的clang目录，因为cmake CACHE PATH的时候 ,里面有CMakeCache.txt错误会保留,
重新
./emsdk activate --build=Release sdk-incoming-64bit binaryen-master-64bit

/opt/mt/emsdk/emscripten/incoming/tools/optimizer/CMakeLists.txt
的cc也找不到

set(CMAKE_C_COMPILER "/usr/local/gcc8/bin/gcc")
set(CMAKE_CXX_COMPILER "/usr/local/gcc8/bin/g++")

删掉incoming上一层 的编译的目录
重新

/opt/mt/emsdk/binaryen/master/CMakeLists.txt
加入

set(CMAKE_C_COMPILER "/usr/local/gcc8/bin/gcc")
set(CMAKE_CXX_COMPILER "/usr/local/gcc8/bin/g++")

删掉master上一层 的编译的目录
重新

##############################


测试hello.c

#include <stdio.h>
int main( )
{
  printf("Hello World!\n");
}

emcc hello.c
node a.out.js


安装em-dosbox:
git clone https://github.com/killinux/em-dosbox

cd em-dosbox
./autogen.sh
emconfigure ./configure --prefix=/usr/local/em-dosbox  --enable-wasm
make -j4

注意一定要有  --enable-wasm

运行打包exe的时候如果出现
TypeError: Module.addRunDependency is not a function

是因为没有FORCE_FILESYSTEM=1
编译前
需要修改
vim src/makefile.am

this change is necessary for file-system access. Otherwise the games do not start.

changed in "src/makefile.am"
line21(new):
dosbox_LDFLAGS=-s TOTAL_MEMORY=134217728 -s ALLOW_MEMORY_GROWTH=0 -s FORCE_FILESYSTEM=1
line32(new):
dosbox_LDFLAGS+=-s WASM=1 -s 'BINARYEN_TRAP_MODE="clamp"'

taken from:
https://medium.com/@bartoszpolnik/emulating-deluxe-ski-jump-2-with-dosbox-and-wasm-88f24f5a4aaf

再make -j4



############# mac 下：
参考https://csl.name/post/em-dosbox/

直接

brew install SDL2 SDL2_image emscripten  
brew install binaryen

~/.emscripten
检查一下，需要类似如下：

LLVM_ROOT = "/usr/local/opt/emscripten/libexec/llvm/bin"
NODE_JS = "/usr/local/bin/node"
EMSCRIPTEN_ROOT = "/usr/local/Cellar/emscripten/1.38.44/libexec"
BINARYEN_ROOT = "/usr/local/opt/binaryen"
COMPILER_ENGINE = NODE_JS
JS_ENGINES = [NODE_JS]

emcc不报错
emcc hello.c


cd em-dosbox
emconfigure ./configure --prefix=/usr/local/em-dosbox --enable-wasm
make -j4

mac 已经解决,注意VERSION问题，如果报错，就删掉em-dosbox/VERSION
这个文件和编译时，系统需要的<version>冲突了


python3 -m http.server 9999

################# 普通 dosbox 的基本使用

dosbox:
mount c ~/mydos
ctrl +f10 退出


去百度盘下载 masm工具，放到 ~/mydos下
mt下面有tools.rar


dosbox的helloworld：
https://www.cnblogs.com/flipped/p/7683656.html

hello.asm

STACK SEGMENT STACK 
    DB 200 DUP(0)  
STACK ENDS

DATA SEGMENT
    BUF DB 'Hello world!$'  
DATA ENDS

CODE SEGMENT
    ASSUME CS:CODE,DS:DATA,SS:STACK  
  
START:
    MOV AX,DATA
    MOV DS,AX
    LEA DX,BUF
    MOV AH,9
    INT 21H
    MOV AH,4CH
    INT 21H
    CODE ENDS
END START

masm hello
生成hello.obj


link hello
生成hello.exe


########## 在em-dosbox中运行这个exe
#./packager.py gwbasic gwbasic.exe
./packager.py hello HELLO.EXE
会生成hello.html
如果遇到问题看这个https://github.com/dreamlayers/em-dosbox/issues/49
需要configure的时候--enable-wasm 和 src/Makefile.am 中 设置 -s FORCE_FILESYSTEM=1

python -m SimpleHTTPServer 8000
访问hello.html即可



https://www.helplib.com/GitHub/article_98874

###########

jsdos:

https://js-dos.com/getting-started/

https://dos.zczc.cz/games/%E8%B6%85%E6%97%B6%E7%A9%BAG%E7%82%B9/


https://github.com/killinux/emularity

原来的github上的dosbox-sync.js dosbox-sync.mem没有了，去doc.zczc.cz上找到的这俩文件


################# 使用DosBox运行dos游戏的简易方法
http://blog.lujun9972.win/blog/2017/11/01/%E4%BD%BF%E7%94%A8dosbox%E8%BF%90%E8%A1%8Cdos%E6%B8%B8%E6%88%8F%E7%9A%84%E7%AE%80%E6%98%93%E6%96%B9%E6%B3%95/index.html

cp cskgd.zip ~/mydos
unzip cskgd.zip

/Applications/dosbox.app/Contents/MacOS
./DOSBox
mount c ~/mydos
c:
cd cskgd
qr



问题：
已经有的exe 怎么用em-dosbox运行
已经解决
package.py hello HELLO.EXE

注意原版的em-dosbox需要打个补丁https://github.com/dreamlayers/em-dosbox/issues/49




################ emscripten的文件系统
https://segmentfault.com/a/1190000011228779

https://github.com/zephyrproject-rtos/zephyr/pull/348
brew install gettext qemu help2man mpfr gmp coreutils wget python3 dfu-util dtc