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pedantic gcc and const 2D arrays

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IIRC, this is my first on-topic post in comp.lang.c group.
As they say, nobody is perfect.

// pedant_2d.c
int bar(const int a[5][42])
{
  return a[0][0];
}

int foo(int x)
{
  int a[5][42];
  a[0][0] = 1;
  return bar(a);
}

// end of pedant_2d.c


$ gcc -std=c17 -pedantic  -c  pedant_2d.c
pedant_2d.c: In function 'foo':
pedant_2d.c:10:14: warning: invalid use of pointers to arrays with
different qualifiers in ISO C before C23 [-Wpedantic] 10 |   return
bar(a); |              ^

What does it mean ?

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pedantic gcc and const 2D arrays Michael S <already5chosen@yahoo.com> - 2026-04-09 01:21 +0300
  Re: pedantic gcc and const 2D arrays Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-08 15:57 -0700
    Re: pedantic gcc and const 2D arrays Michael S <already5chosen@yahoo.com> - 2026-04-09 03:09 +0300
      Re: pedantic gcc and const 2D arrays 🇵🇱Jacek Marcin Jaworski🇵🇱 <jmj@energokod.gda.pl> - 2026-04-09 02:33 +0200
      Re: pedantic gcc and const 2D arrays Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-08 21:42 -0700
  Re: pedantic gcc and const 2D arrays Andrey Tarasevich <noone@noone.net> - 2026-04-08 20:34 -0700
    Re: pedantic gcc and const 2D arrays Michael S <already5chosen@yahoo.com> - 2026-04-09 11:09 +0300
    Re: pedantic gcc and const 2D arrays "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-09 02:38 -0700
      Re: pedantic gcc and const 2D arrays Michael S <already5chosen@yahoo.com> - 2026-04-09 14:06 +0300
        Re: pedantic gcc and const 2D arrays "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-09 13:09 -0700
          Re: pedantic gcc and const 2D arrays Andrey Tarasevich <noone@noone.net> - 2026-04-12 11:30 -0700
            Re: pedantic gcc and const 2D arrays Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-13 05:40 -0700

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