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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/103115] [12 Regression] reallocation of character array
 fails when appending a constant size 4 array
Date: Wed, 17 Nov 2021 16:30:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103115

--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to J=C3=BCrgen Reuter from comment #6)

> Really interesting, I don't get an ICE with the following setup:
> ../configure --prefix=3D/usr/local/ --with-gmp=3D/usr/local/
> --with-mpfr=3D/usr/local/ --with-mp=3D/usr/local/
> --with-sysroot=3D/Applications/Xcode.app/Contents/Developer/Platforms/Mac=
OSX.
> platform/Developer/SDKs/MacOSX.sdk/ --enable-checking=3Drelease
> --enable-languages=3Dc,c++,fortran,lto,objc,obj-c++
> $ gfortran --version
> GNU Fortran (GCC) 12.0.0 20211115 (experimental)
> Maybe the enable-checking setup!?

Extremely likely.

--enable-checking=3Drelease turns off a very large number of checks
which are really only interesting for developers to find bugs,
and which make the compiler run rather slowly.=