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Subject: [Bug bootstrap/92002] [10/11 regression] -Wuninitialized warning in
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Date: Wed, 03 Mar 2021 15:06:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92002

--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Rainer Orth <ro@gcc.gnu.org>:

https://gcc.gnu.org/g:fa6092d2cdc654d4b2e018929c0dbe13fbd4ea69

commit r11-7484-gfa6092d2cdc654d4b2e018929c0dbe13fbd4ea69
Author: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Date:   Wed Mar 3 16:01:50 2021 +0100

    sparcv9: Disable -Wuninitialized warnings breaking bootstrap [PR92002]

    sparcv9 bootstrap has been broken for 1 1/2 years now by spurious
    -Wuninitialized warnings:

    In function =C3=A2wide_int wi::max_value(unsigned int, signop)=C3=A2,
        inlined from =C3=A2wide_int wi::max_value(unsigned int, signop)=C3=
=A2 at
/vol/gcc/src/hg/master/local/gcc/wide-int.cc:330:1:
    /vol/gcc/src/hg/master/local/gcc/wide-int.cc:335:31: error:
=C3=A2<anonymous>.generic_wide_int<wide_int_storage>::<anonymous>.wide_int_=
storage::val[1]=C3=A2
may be used uninitialized [-Werror=3Dmaybe-uninitialized]
      335 |     return shwi (-1, precision);
          |                               ^
    [...]
    In function =C3=A2wide_int get_nonzero_bits(const_tree)=C3=A2,
        inlined from =C3=A2wide_int get_nonzero_bits(const_tree)=C3=A2 at
/vol/gcc/src/hg/master/local/gcc/tree-ssanames.c:531:1:
    /vol/gcc/src/hg/master/local/gcc/tree-ssanames.c:544:67: error:
=C3=A2<anonymous>.generic_wide_int<wide_int_storage>::<anonymous>.wide_int_=
storage::val[1]=C3=A2
may be used uninitialized [-Werror=3Dmaybe-uninitialized]
      544 |                          | (HOST_WIDE_INT) pi->misalign,
precision);
          |                                                                =
   ^
    [...]

    Before we ship yet another release with this issue, I suggest to at
    least include a workaround of demoting them to warnings.

    Tested on sparcv9-sun-solaris2.11.


    2021-03-03  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

            gcc:
            PR bootstrap/92002
            * config/sparc/t-sparc (tree-ssanames.o-warn): Don't error for
            -Wuninitialized, -Wmaybe-uninitialized.
            (wide-int.o-warn): Likewise.=