I am working on an issue that involves our tool depending on the
preprocessed output from gcc -E.
This simple test program exhibits the problem
#include <stdlib.h>
int main() {
return EXIT_SUCCESS;
}
With some elision, this preprocesses to:
# 3 "test.c"
int main() {
return
# 4 "test.c" 3 4
0
# 4 "test.c"
;
}
Notice how when the macro EXIT_SUCCESS is expanded, we get several lines
around the 0?
This is happening for us with GCC 8.3. But using something as early as
4.8.5 (yeah, I know,
bad idea), we get this:
int main() {
return 0;
}
I am pretty sure this is an intentional change. What I'd like to know is
if there is a way of
reverting back to the former behavior? I looked at
https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options
But didn't see anything that jumped out at me and said "this is how you can
work around it"
I did a modicum of bi-secting to see that this change was introduced
somewhere between gcc
4.9.3 and 5.4.0. I can go deeper to figure out which version actually
broke it if you would find
it helpful.
If anyone has some ideas on this, I'd appreciate hearing them.
Thanks,
Tom
