Why does it change the output of the compilation of certain programs? The
documentation implies strongly that it only affects the warnings produced. The
following program demonstrates this.
-----
/* Authors: Florian Schanda and Martin Brain */
#include <stdio.h>
int main(int argc, char ** argv)
{
const int foo = 5;
int b;
void * ptr;
int * intptr;
ptr = (void*)&foo;
intptr = (int*)ptr;
*intptr = 10;
b = foo;
if (b == 5) {
printf("You seem to constant fold stuff.\n");
} else {
printf("You don't seem to constant fold.\n");
}
return 0;
}
-----
$ gcc -Wall -O3 stupid.c && ./a.out
You seem to constant fold stuff.
$ gcc -Wall -O3 -pedantic stupid.c && ./a.out
You don't seem to constant fold.
We note that this "works" as expected with g++, i.e. pedantic doesn't change
the output of the program.
--
Summary: Questions on details of -pedantic
Product: gcc
Version: 4.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: florian at schanda dot org dot uk
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44939
