没有标准库的语言引擎

Question

有没有人知道语言引擎（编译器或解释器，AST，语法和基本语义），但没有标准库（希望甚至不是整数或算术）。 有这样的事吗？ 我希望能够用C ++实现标准库。 这样的事情存在吗？

Answer 1

GCC（我很确定很多其他编译器）允许你使用-nostdinc （也是-nostdinc++ for C ++）和-nostdlib标志构建没有标准头文件和/或库的代码。

例如：

$ cat t.cpp
#include <iostream>

int main()
{
    std::cout << "ouch" << std::endl;
}
$ g++ -nostdinc t.cpp            # Failed compilation
t.cpp:1:20: error: no include path in which to search for iostream
t.cpp: In function ‘int main()’:
t.cpp:5:5: error: ‘cout’ is not a member of ‘std’
t.cpp:5:28: error: ‘endl’ is not a member of ‘std’
$ g++ -nostdinc++ t.cpp          # Failed compilation
t.cpp:1:20: fatal error: iostream: No such file or directory
compilation terminated.
$ g++ -nostdlib t.cpp            # Compiles, but fails to link
/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/../../../../x86_64-pc-linux-gnu/bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000400158
/tmp/ccPPO3l6.o: In function `main':
t.cpp:(.text+0xa): undefined reference to `std::cout'
t.cpp:(.text+0xf): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
t.cpp:(.text+0x14): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
t.cpp:(.text+0x1c): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
/tmp/ccPPO3l6.o: In function `__static_initialization_and_destruction_0(int, int)':
t.cpp:(.text+0x4a): undefined reference to `std::ios_base::Init::Init()'
t.cpp:(.text+0x4f): undefined reference to `std::ios_base::Init::~Init()'
t.cpp:(.text+0x54): undefined reference to `__dso_handle'
t.cpp:(.text+0x61): undefined reference to `__cxa_atexit'
collect2: ld returned 1 exit status

这用于构建不能使用C库的内核代码。

_{祝福实施标准库，这是一项艰巨的任务。}