[Bug fortran/103115] [12 Regression] reallocation of character array fails when appending a constant size 4 array

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103115

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

> Really interesting, I don't get an ICE with the following setup:
> ../configure --prefix=/usr/local/ --with-gmp=/usr/local/
> --with-mpfr=/usr/local/ --with-mp=/usr/local/
> --with-sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.
> platform/Developer/SDKs/MacOSX.sdk/ --enable-checking=release
> --enable-languages=c,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=release 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.