Note that the C++ warning is for jumping over a declaration,
which is generally allowed in C but not in C++.
Martin
Am Donnerstag, dem 19.10.2023 um 13:49 +0200 schrieb Martin Uecker:
>
>
> GCC supports this as an extension.
>
> Mixing declarations and code is allowed in C99 and C23
> will also allow placing labels before declarations and at
> the end of a compound statement. GCC supports all this
> also in earlier language modes.
>
> See:
> https://gcc.gnu.org/onlinedocs/gcc/Mixed-Labels-and-Declarations.html
>
> You will get the warnings with -pedantic.
>
> Martin
>
> Am Donnerstag, dem 19.10.2023 um 07:39 -0400 schrieb Eric Sokolowsky via Gcc:
> > I am using gcc 13.2 on Fedora 38. Consider the following program.
> >
> > #include <stdio.h>
> > int main(int argc, char **argv)
> > {
> > printf("Enter a number: ");
> > int num = 0;
> > scanf("%d", &num);
> >
> > switch (num)
> > {
> > case 1:
> > int a = num + 3;
> > printf("The new number is %d.\n", a);
> > break;
> > case 2:
> > int b = num - 4;
> > printf("The new number is %d.\n", b);
> > break;
> > default:
> > int c = num * 3;
> > printf("The new number is %d.\n", c);
> > break;
> > }
> > }
> >
> > I would expect that gcc would complain about the declaration of
> > variables (a, b, and c) within the case statements. When I run "gcc
> > -Wall t.c" I get no warnings. When I run "g++ -Wall t.c" I get
> > warnings and errors as expected. I do get warnings when using MinGW on
> > Windows (gcc version 6.3 specifically). Did something change in 13.2?
> >
> > Eric
>
