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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98904] New: valgrind error in gfc_trans_assignment_1
 during bootstrap
Date: Sun, 31 Jan 2021 16:44:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98904

            Bug ID: 98904
           Summary: valgrind error in gfc_trans_assignment_1 during
                    bootstrap
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

I just tried to make a valgrind build of gcc fortran with -O3.

My configure lines are

../trunk.git/configure --prefix=3D/home/dcb/gcc/$PREFIX \
        --disable-bootstrap \
        --disable-multilib \
        --disable-werror \
        --with-pkgversion=3D$HASH \
        --enable-checking=3Dvalgrind \
        --enable-languages=3Dfortran

sed 's/-O2/-O3/' < Makefile > Makefile.tmp
mv Makefile.tmp Makefile

When compiling source code file omp_lib.f90 in libssp, I get

=3D=3D147960=3D=3D Conditional jump or move depends on uninitialised value(=
s)
=3D=3D147960=3D=3D    at 0x761595: gfc_trans_assignment_1(gfc_expr*, gfc_ex=
pr*, bool,
bool, bool, bool) (trans-expr.c:11340)
=3D=3D147960=3D=3D    by 0x75FE1C: gfc_trans_assignment(gfc_expr*, gfc_expr=
*, bool,
bool, bool, bool) (trans-expr.c:11557)
=3D=3D147960=3D=3D    by 0x71D39A: trans_code(gfc_code*, tree_node*) (trans=
.c:1922)
=3D=3D147960=3D=3D    by 0x745B96: gfc_generate_function_code(gfc_namespace=
*)
(trans-decl.c:6880)

Line 11340 is

     && lhs_caf_attr.codimension && rhs_caf_attr.codimension

As part of

  else if (flag_coarray =3D=3D GFC_FCOARRAY_LIB
           && lhs_caf_attr.codimension && rhs_caf_attr.codimension
           && ((lhs_caf_attr.allocatable && lhs_refs_comp)
               || (rhs_caf_attr.allocatable && rhs_refs_comp)))
    {=