https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92487
Bug ID: 92487
Summary: case label error when label is made from character of
C string
Product: gcc
Version: 9.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: SztfG at yandex dot ru
Target Milestone: ---
testcase:
void test(char x)
{
switch (x)
{
case "abc"[0]: // error: case label does not reduce to an integer constant
printf("a\n");
break;
case "abc"[1]: // error: case label does not reduce to an integer constant
printf("b\n");
break;
default:
printf("other\n");
break;
}
}
clang and icc is able to compile this.
Clang with -pedantic telling
> warning: expression is not an integer constant expression; folding it to a
> constant is a GNU extension [-Wgnu-folding-constant]
https://godbolt.org/z/xvGJB4
So this is some GNU extension, but why GCC doesn't support it?
