Include header files in a single header file?

[enrightb13]

I am writing a large real-time embedded in C. Is it better to include all header files in one header file for simplicity, and include this single header file in the main file, or does this significantly slow down compilation time? Also, would this affect processing speed?

[weaknessforcats]

Nested headers does not affect execution speed.

Nested headers will increase compile time. But so what?

You need to be sure tour headers all have inclusion guards to ptevent the contents from being include more than once. Otherwise you can get redefinition errors.

#ifndef   MYHEADER
#define MYHEADER
 
       /*contents of header file here */
#endif
 

Lastly, your header files must contain nothing that occupies memory or generates instructions. If they do, you need to remove it and put it in an implementation file. Then change the header to refer to that implementation file.