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From: "bernie at codewiz dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105438] Incorrect array-bounds warning with array size
 carried over from a previous template instantiation
Date: Mon, 02 May 2022 06:05:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105438

--- Comment #2 from Bernie Innocenti <bernie at codewiz dot org> ---
GCC 12.0.1 20220413 (Red Hat 12.0.1-0) gives a more helpful diagnostic with
inlining backtrace:

In function =E2=80=98void configure(const int (&)[N], int) [with int N =3D =
7]=E2=80=99,
    inlined from =E2=80=98void configure(const int (&)[N], int) [with int N=
 =3D 2]=E2=80=99 at
testcase.cc:8:6,
    inlined from =E2=80=98int main()=E2=80=99 at gcc-array-bounds-bug-testc=
ase.cc:22:12:
testcase.cc:14:24: warning: array subscript =E2=80=98const int [7][0]=E2=80=
=99 is partly
outside array bounds of =E2=80=98int [2]=E2=80=99 [-Warray-bounds]
   14 |             out[i] =3D in[i];
      |                      ~~^


Note how configure<N=3D7>() was inlined into configure<N=3D7>().=