为什么司机和固件几乎都是用C或ASM，而不是C ++？ [英] Why are drivers and firmwares almost always written in C or ASM and not C++?

问题描述

我只是好奇，为什么司机和固件几乎一直都是用C语言或汇编语言，而不是C ++？

I am just curious why drivers and firmwares almost always are written in C or Assembly, and not C++?

我听说有这种技术的原因。

I have heard that there is a technical reason for this.

有谁知道这一点？

爱情很多，
路易丝

Lots of love, Louise

推荐答案

由于，大部分时间，操作系统（或运行时库）提供了C语言所需的STDLIB功能++。

Because, most of the time, the operating system (or a "run-time library") provides the stdlib functionality required by C++.

在C和ASM可以创建裸可执行文件，它不包含任何外部依赖性。

In C and ASM you can create bare executables, which contain no external dependencies.

但是，因为Windows不支持C ++ STDLIB，大多数的Windows驱动程序都写在（有限的子集）C ++。

However, since windows does support the C++ stdlib, most Windows drivers are written in (a limited subset of) C++.

此外，当固件写入ASM通常是因为无论是（A），它是在执行没有一个C ++编译器或（B）有极高的速度和大小限制的平台。

Also when firmware is written ASM it is usually because either (A) the platform it is executing on does not have a C++ compiler or (B) there are extreme speed or size constraints.

需要注意的是（B）还没有被完全自2000年初的一个问题。

Note that (B) hasn't generally been an issue since the early 2000's.

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