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NachOS的安装
1.首先解压缩安装文件：
tar zxvf NachOS-4.1_110.gz
上过信安实践的都会的吧～解压在当前文件夹之下
2.进入如下目录：
cd NachOS-4.1/code/build.linux/
同上～
3.执行make depend（依赖检验）：
make depend
这里可能有一个问题当然你（没有问题最好拉），安装教程上没提到，就是会提示
error：iostream.h不存在，然后就继续不下去了。。。
因为这是老的c++头文件，新的编译器可能不认可（官方反对使用啦～）
修改NachOS4.1//lib/sysdep.h:
"iostream.h" 改为 "iostream" 下一行再加句 using namespace std;
使用新的标准的头文件。
4.进行编译：
make
可能碰到的问题（抄安装教程的）
在安装的过程中，由于g++版本兼容性的问题，可能在编译的时候出现以下的错误：
1．cc1plus: error: unrecognized command line option "-fwritable-strings"
解决方法：修改NachOS-4.1/code/build.linux/Makefile，第203行，将-fwritable-str
ings去掉，即：
CFLAGS = -ftemplate-depth-100 -Wno-deprecated -g -Wall $(INCPATH) $(DEFINES)
$(HOSTCFLAGS) –DCHANGED
2．在编译NachOS-4.1/code/lib/list.cc时可能会出现很多如下的错误：
../lib/list.cc: In member function ‘void SortedList<T>::Insert(T)’:
../lib/list.cc:240: error: there are no arguments to ‘IsEmpty’ that
depend on a template parameter, so a declaration of ‘IsEmpty’ must be
available
../lib/list.cc:240: error: (if you use ‘-fpermissive’, G++ will accept
your code, but allowing the use of an undeclared name is deprecated)
../lib/list.cc:241: error: ‘first’ was not declared in this scope
../lib/list.cc:242: error: ‘last’ was not declared in this scope
../lib/list.cc:243: error: ‘first’ was not declared in this scope
../lib/list.cc:251: error: ‘numInList’ was not declared in this scope
../lib/list.cc:255: error: ‘last’ was not declared in this scope
../lib/list.cc:258: error: ‘numInList’ was not declared in this scope
../lib/list.cc: In member function ‘void SortedList<T>::SanityCheck() const
’:
../lib/list.cc:341: error: ‘first’ was not declared in this scope
../lib/list.cc:341: error: ‘last’ was not declared in this scope
../lib/list.cc: In member function ‘void SortedList<T>::SelfTest(T*, int)’:
../lib/list.cc:371: error: there are no arguments to ‘RemoveFront’ that
depend on a template parameter, so a declaration of ‘RemoveFront’ must be
available
../lib/list.cc:374: error: there are no arguments to ‘IsEmpty’ that
depend on a template parameter, so a declaration of ‘IsEmpty’ must be
available
解决方法：修改NachOS-4.1/code/lib/list.cc文件，将错误信息中所出现的所有函
数（如IsEmpty()）和变量（first，last等）增加this指针，即：this->IsEmpty()，th
is->first，this->last等。
我对比了下大概有17个地方要改吧（见下行号）～
NachOS4.1/lib/list.cc:
240-245,247,251,255-256,258,341-342(各两个),371,374
现在 make 依然有错误。
../lib/sysdep.cc:84:39:error:declaration of C function 'int mprotect
(char*, unsigned int, int)' conflicts with
/usr/include/sys/mman.h:82:12: error: previous declaration 'int mprotect(void*, size_t, int)' here
../lib/sysdep.cc:95:25:error: error: declaration of C function 'int select(int, void*, void*, void*, timeval*)' conflicts with
/usr/include/sys/select.h:109:12: error: previous declaration 'int select(int, fd_set*, fd_set*, fd_set*, timeval*)' here
../lib/sysdep.cc: In function 'int Tell(int)':
../lib/sysdep.cc:405:19: error: 'tell' was not declared in this scope
../lib/sysdep.cc: In function 'void ReadFromSocket(int, char*, int)':
../lib/sysdep.cc:535:41: error: invalid conversion from 'int*' to 'socklen_t*'
../lib/sysdep.cc:535:41: error: initializing argument 6 of 'ssize_t recvfrom(int, void* ,size_t, int, sockaddr*, socklen_t*)'
make: *** [sysdep.o] 错误 1
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