Hello,

Say I define a macro

#define MYMACRO(x,y) ….

MYMACRO because of various reasons takes very long to expand (1mn) (uses PP_FOR, PP_WHILE, PP_SEQ_FOR_EACH …).

If later in the translation unit, I have a “call” to MYMACRO

MYMACRO(a,b)

and then a couple of lines later

MYMACRO(a,b)

Will it be faster to define

line 15: #define MYMACRO_ab MYMACRO(a,b)

and then use

line 25: MYMACRO_ab

…

line 35: MYMACRO_ab

When does MYMACRO expansion happen?

Is it at line 15 once, or at lines 25 and 35?

Is the answer compiler-dependent?

Regards,