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  1. RHEL
  2. RHEL-39735

gcc: Cannot make struct sockaddr aliasing-compatible if LTO is enabled [rhel-9]

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    • rhel-9.5
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    • gcc-11.5.0-2.el9
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    • Red Hat Enterprise Linux
    • GCC Sprint 9
    • Unspecified Release Note Type - Unknown
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      Under RHEL-38861, we are implementing the POSIX rules for struct sockaddr type-based aliasing analysis. It has come to our intention that this approach is not fully compatible with -flto.

      • Bug 114493 - [11/12/13/14/15 Regression] internal compiler error: in fld_incomplete_type_of with may_alias

      The reproducer is quite simple. Compiling it with -flto is enough:

      typedef struct git_midx_writer git_midx_writer;
int git_futils_rmdir_flags;
int __attribute__git_midx_writer_new(git_midx_writer **);
struct __attribute__((__may_alias__)) git_midx_writer {};

       

              mpolacek@redhat.com Marek Polacek
              fweimer@redhat.com Florian Weimer
              Marek Polacek Marek Polacek
              Vaclav Kadlcik Vaclav Kadlcik
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                Created:
                Updated:
                Resolved: