[Bug fortran/120812] New: [regression] buffer(80:80) = C_NEW_LINE not working with gfortran 15.1 under Mac

[christophe.peyret at onera dot fr via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120812

            Bug ID: 120812
           Summary: [regression] buffer(80:80) = C_NEW_LINE not working
                    with gfortran 15.1 under Mac
           Product: gcc
           Version: 15.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: christophe.peyret at onera dot fr
  Target Milestone: ---

Created attachment 61702
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61702&action=edit
buffer(80:80) = C_NEW_LINE not working

Hello,

I face a problem with gfortran 15.1 on my Mac Intel and Mac Apple Silicon (that
didn't exist with gfortran 14)

I declare :

character(len=:), pointer :: buffer=>null()
allocate( character(len=80) :: buffer )

when I enter :

buffer(80:80) = C_NEW_LINE

the C_NEW_LINE is inserted at buffer(1:1). 
If I want it to work I need to enter:

buffer(1:80) = buffer(1:79) // C_NEW_LINE


I join a small example that reproduces the problem

Sincerely
Christophe