Implicit declaration of function found in header?

Question

I have the following in my file.h:

#define SetSP(sp)  asm("movq  %0,%%rsp":           : "r" (sp)  )

However, in my file.c file, when I try using it for example:

SetSp(lwp_ptable[lwp_procs].sp);

I get an implicit declaration of function SetSp, when I compile file.c. I have #include "file.h" in file.c. Thoughts?

Answer 1

Your define is SetSP , while you use it as SetSp , note the case difference in letter p . Welcome to case sensitive language...

Answer 2

如果您复制并粘贴了代码，请注意SetSP与SetSp （调用宏时，您使用了小写的p）。