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LI80797: COMPILER ABEND WHEN COMPILING WIHT -QCHECK

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APAR status

  • Closed as program error.

Error description

  • The compiler abends when trying to compile the following
    testcase using -qcheck:
    
    =======TESTCASE:
    $ cat t.cc
    bool color_set[3];
    
    int foo(void)
    {
        color_set[0] = 0;
    }
    
    
    ========COMPILE COMMAND:
    xlc_r -+ t.cc -qcheck -c
    
    
    ========ACTUAL OUTPUT:
    $ xlc_r -+ t.cc -qcheck -c
    Line     ? Displ 00000000000019E0  OD_diff::alloc_opt0(PlObj&,
    CtObj&, FastPlSummary&, Opt0Allocator&, int) const
    Line     ? Displ 000000000000194C  OD_diff::alloc_opt0(PlObj&,
    CtObj&, FastPlSummary&, Opt0Allocator&, int) const
    Line     ? Displ 0000000000000BB4
    OD_regcantbe_when_toc::alloc_opt0(PlObj&, CtObj&,
    FastPlSummary&, Opt0Allocator&, int) const
    Line     ? Displ 00000000000013FC  OpDesc::alloc_opt0(PlObj&,
    CtObj&, Opt0Allocator&) const
    Line     ? Displ 000000000000008C  PlObj::alloc_opt0(CtObj&,
    Opt0Allocator&)
    Line     ? Displ 00000000000001CC  fast_cobra
    Line     ? Displ 0000000000000860  ra
    Line     ? Displ 0000000000000604  regallo
    Line     ? Displ 0000000000000194  IPRA.$invoke_tobey
    Line     ? Displ 0000000000000DD8  xlator_main
    Line     ? Displ 00000000000000D8  main
    xlator_terminate..000000000000005C main..00000000000001AC
    $
    
    
    ========EXPECTED OUTPUT:
    Compiler should no abend
    

Local fix

  • N/A
    

Problem summary

  • USERS AFFECTED:
    Users compiling at -O0 with -qcheck may be affected by this
    issue.
    
    PROBLEM DESCRIPTION:
    The compiler produces a segfault when compiling certain test
    case at -O0 with -qcheck due to an incorrect compiler
    optimization.
    

Problem conclusion

  • The compiler optimization is now fixed.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI80797

  • Reported component name

    XL C/C++ FOR LI

  • Reported component ID

    5725C7300

  • Reported release

    G11

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-05-03

  • Closed date

    2019-06-21

  • Last modified date

    2019-06-21

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    XL C/C++ LINUX

  • Fixed component ID

    5725C7310

Applicable component levels



Document information

More support for: XL C/C++ for Linux

Software version: G11

Reference #: LI80797

Modified date: 21 June 2019