https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101827
--- Comment #2 from Ignacio Fernández Galván <jellby at yahoo dot com> --- What's a TU? I didn't succeed (but didn't try to hard) in creating a minimal test case. But this reproduces the problem: $ git clone -b ipo https://gitlab.com/Molcas/OpenMolcas.git $ cd OpenMolcas $ git submodule update --init External/lapack # (comment out the line in src/gateway_util/Symmetry_Info.f90 # that refers to this report, i.e. search for 101827. # But note that the "ipo" branch is in development and will change.) $ mkdir build $ cd build $ cmake -D BUILD_SHARED_LIBS=ON -D BIGOT=ON .. $ make [...] [ 65%] Linking Fortran shared library lib/libmolcas.so In function ‘chtab’, inlined from ‘__symmetry_info_MOD_symmetry_info_setup.part.0’ at /OpenMolcas/src/gateway_util/Symmetry_Info.f90:335:0: /OpenMolcas/src/gateway_util/Symmetry_Info.f90:655: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=] 655 | lIrrep(iIrrep-1)(i1:i1)='u' | /OpenMolcas/src/gateway_util/Symmetry_Info.f90: In function ‘__symmetry_info_MOD_symmetry_info_setup.part.0’: /OpenMolcas/src/gateway_util/Symmetry_Info.f90:17:60: note: at offset 0 to object ‘lirrep’ with size 24 declared here 17 | Public :: nIrrep, iOper, iChTbl, iChCar, Mul, iChBas, lIrrep, lBsFnc, SymLab, iSkip, & | ^ In function ‘chtab’, inlined from ‘__symmetry_info_MOD_symmetry_info_setup.part.0’ at /OpenMolcas/src/gateway_util/Symmetry_Info.f90:335:0: /OpenMolcas/src/gateway_util/Symmetry_Info.f90:653: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=] 653 | lIrrep(iIrrep-1)(i1:i1)='g' | /OpenMolcas/src/gateway_util/Symmetry_Info.f90: In function ‘__symmetry_info_MOD_symmetry_info_setup.part.0’: /OpenMolcas/src/gateway_util/Symmetry_Info.f90:17:60: note: at offset 0 to object ‘lirrep’ with size 24 declared here 17 | Public :: nIrrep, iOper, iChTbl, iChCar, Mul, iChBas, lIrrep, lBsFnc, SymLab, iSkip, & | ^ lto1: all warnings being treated as errors lto-wrapper: fatal error: /usr/bin/gfortran returned 1 exit status
