On 5/4/21 9:34 AM, Peng Yu via Gcc-help wrote:
Hi,
__FILE__ is the full path of the file used at compile time.
$ cat a/test.c
#include <stdio.h>
int main() {
puts(__FILE__);
return 0;
}
$ gcc a/test.c
$ ./a.out
a/test.c
The following discussion says there is no way to get its basename and
dirname at compile time. Is it still the case?
Could <string.h> functions be used at compile time for __FILE__ since
__FILE__ is known at compile time anyway? Thanks.
https://stackoverflow.com/questions/8487986/file-macro-shows-full-path
There is no macro for just the base name part of __FILE__ that I know
of but it can be computed from __FILE__ using strrchr as someone shows
in the thread:
(strrchr (__FILE__, '/') ? strrchr (__FILE__, '/') + 1 : __FILE__)
This is evaluated at compile time even without optimization.
Getting just the directory part isn't as easy.
Martin
