As part of the change to larger character lengths, the string copy
algorithm was temporarily pessimized to get around some spurious
-Wstringop-overflow warnings. Having tried a number of variations of
this algorithm I have managed to get it down to one spurious warning,
only with -O1 optimization, in the testsuite. This patch reinstates
the optimized variant and modifies this one testcase to ignore the
warning.
Regtested on x86_64-pc-linux-gnu.
gcc/fortran/ChangeLog:
2018-01-31 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/78534
* trans-expr.c (fill_with_spaces): Use memset instead of
generating loop.
(gfc_trans_string_copy): Improve opportunity to use builtins with
constant lengths.
gcc/testsuite/ChangeLog:
2018-01-31 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/78534
* gfortran.dg/allocate_deferred_char_scalar_1.f03: Prune
-Wstringop-overflow warnings due to spurious warning with -O1.
* gfortran.dg/char_cast_1.f90: Update dump scan pattern.
* gfortran.dg/transfer_intrinsic_1.f90: Likewise.
From-SVN: r257233
