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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/53431] C++ preprocessor ignores #pragma GCC diagnostic ignored "-Wundef"
Date: Sat, 16 Nov 2013 20:23:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D53431

Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |scottbaldwin at gmail dot =
com

--- Comment #6 from Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez <manu at gcc dot gnu=
.org> ---
*** Bug 57241 has been marked as a duplicate of this bug. ***
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Subject: [Bug inline-asm/59157] New: "+f" constraint rejected: output constraint 0 must specify a single register
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59157

            Bug ID: 59157
           Summary: "+f" constraint rejected: output constraint 0 must
                    specify a single register
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
          Assignee: unassigned at gcc dot gnu.org
          Reporter: glisse at gcc dot gnu.org
            Target: x86_64-unknown-linux-gnu

double f(double x){
  asm volatile("":"+f"(x));
  return x;
}

a.c: In function 'f':
a.c:2:3: error: output constraint 0 must specify a single register
   asm volatile("":"+f"(x));
   ^

If I use "+mf", it is accepted with -m64 but still fails with -m32.