Have GCC give warnings for the preprocessed file - gcc

Question

GCC shows line numbers for the .c file, which in my case is a macro that is defined using other macros, which are defined using even more macros, etc. Is there a way to have GCC give the line numbers for the preprocessed .i file instead?
bla.c
#include <stdlib.h>
#include <stdio.h>
#define PRINT(a) printf("%d\n", (a));
int main()
{
double a = 2.5;
PRINT(a);
return 0;
}
It will print the warning for the line containing PRINT(a) (line 10), but I want it to print the line containing printf("%d\n", (a));; from the preprocessed file (line 1837)
preprocessed file:
<other code above>
int main()
{
double a = 2.5;
printf("%d\n", (a));;
return 0;
}

Answer 1

Use the options -no-integrated-cpp -P to get:
/tmp/ccQ2ECah.i: In function 'main':
/tmp/ccQ2ECah.i:729:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'double' [-Wformat=]
729 | printf("%d\n", (a));;
| ~^ ~~~
| | |
| int double
| %f
The -no-integrated-cpp option causes the preprocessor and compiler to run as truly separate passes, where the only communication between them is the preprocessor output.
In this mode, the preprocessor would normally include #line directives in its output to identify source line numbers from the original file. The -P option suppresses them. Then the compiler pass has no information about the original file's line numbers, and can only print the line numbers of the preprocessor output.