compiler questions

• Why are there so many CPU architectures: x86, x64, x87, etc...?
• What's the script language inside kernel Makefile?
• How to run assembly in gdb directly?
• Why is the 'max' macro defined like this in C?
• How to know which library a specific function is defined in?
• How to print -0x4(%rbp) in gdb?
• Why are there no debug symbols in my vmlinux when using gdb with /proc/kcore?
• How to quit strace when attached to a process?
• Why does an empty declaration work for definitions with int arguments but not for float arguments?
• What exactly does fork return?

compiler answers