https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120483
Bug ID: 120483
Summary: character(len=:), allocatable, save variable returns
incorrect substring
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: peter at guentert dot com
Target Milestone: ---
When using a deferred-length allocatable character variable with the SAVE
attribute, substring references give incorrect results.
Test case:
---------------------------------------
program test
character(len=:), allocatable, save :: s1
character(len=:), allocatable :: s2
s1 = 'ABC'
print *, 's1='//s1//', s1(3:3)='//s1(3:3)
s2 = 'ABC'
print *, 's2='//s2//', s2(3:3)='//s2(3:3)
end
---------------------------------------
Expected Output:
s1=ABC, s1(3:3)=C
s2=ABC, s2(3:3)=C
Actual Output (gfortran 15.1.0):
s1=ABC, s1(3:3)=A
s2=ABC, s2(3:3)=C
Compiler Version:
$ gfortran --version
GNU Fortran (Homebrew GCC 15.1.0) 15.1.0
System:
MacOS Sequoia 15.5 (24F74)
Homebrew 4.5.3
$ gcc --version
Apple clang version 17.0.0 (clang-1700.0.13.5)
Target: arm64-apple-darwin24.5.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
$ uname -a:
Darwin ... 24.5.0 Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025;
root:xnu-11417.121.6~2/RELEASE_ARM64_T6000 arm64
Notes:
- Removing `SAVE` from `s1` makes it behave correctly.
- gfortran 13.3.0 and Intel compilers give correct results.
