[Bug rtl-optimization/63620] RELOAD lost SET_GOT dependency on Darwin

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63620

--- Comment #11 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Stupachenko Evgeny from comment #10)

> Anyway, if call is not EBX dependent (say local call in Linux) the issue is
> not reproduced (like in example from PR63618).
> So the issue looks like Darwin dependent RA issue.

True. In Darwin case, RA allocates %eax, which is call-used register and
clobbered by the call to f128_p3. I don't see %eax saved around the call.

In Linux case, RA allocates %edi, which is call-saved.
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From: "petschy at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63657] New: [4.9 regression] -Wunused-variable: warning supressed by virtual dtor fn
Date: Mon, 27 Oct 2014 13:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63657

            Bug ID: 63657
           Summary: [4.9 regression] -Wunused-variable: warning supressed
                    by virtual dtor fn
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: petschy at gmail dot com

The under code has two unused variables, which are references to classes. We
should have two warnings, however 4.9.1 and 5.0 trunk gives just one. 4.7.2 and
4.8.3 are ok. The second warning is supressed by the virtual dtor in Bar. Only
the dtor does the trick, if I comment it out or instead I define a plain
virtual fn, the warning appears.

g++-4.8 -Wunused-variable -c 20141022-unused_warn.cpp 
20141022-unused_warn.cpp: In function ‘void foo()’:
20141022-unused_warn.cpp:7:7: warning: unused variable ‘f’ [-Wunused-variable]
  Foo& f = getfoo();
       ^
20141022-unused_warn.cpp: In function ‘void bar()’:
20141022-unused_warn.cpp:18:7: warning: unused variable ‘b’ [-Wunused-variable]
  Bar& b = getbar();
       ^


g++-5.0.0 -Wunused-variable -c 20141022-unused_warn.cpp 
20141022-unused_warn.cpp: In function ‘void foo()’:
20141022-unused_warn.cpp:7:7: warning: unused variable ‘f’ [-Wunused-variable]
  Foo& f = getfoo();
       ^

----8<----8<----8<----
class Foo 
{
};
Foo& getfoo();
void foo()
{
        Foo& f = getfoo();
}

class Bar
{
        virtual ~Bar() {}
};
Bar& getbar();
void bar()
{
        Bar& b = getbar();
}
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/63610] OSX 10.10 (Yosemite) segfault in MPIR testsuite with -O0 or -O1
Date: Mon, 27 Oct 2014 13:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc610

--- Comment #9 from howarth at bromo dot med.uc.edu ---
Alternatively, you can just make sure you don't set MACOSX_DEPLOYMENT_TARGET in
your shell.

Also mote that gmp, mpfr and mpc also suffer from this bug and, if built on
10.10, should either have their configure scripts patched or regenerated with
the fixed libtool.