Re: Visual Studio 2012 RC

On Sun, Oct 07, 2012 at 08:30:22PM +0200, Brar Piening wrote:
> Noah Misch wrote:
>> I'm marking this patch Waiting on Author, but the changes needed to
>> get it Ready for Committer are fairly trivial. Thanks, nm
>
> Thanks for your review and sorry for my delayed response - I've been on
> vacation.
>
> I'll look into adressing your comments and suggestions within the next
> few days.

Thanks.  I decided to try a 32-bit build, but Solution::DeterminePlatform
detected it as x64.  Its shibboleth is no longer valid; the cl.exe shipping
with VS 2012 Express for Desktop has a /favor option for both architectures:

32clhelp:/favor:<blend|ATOM> select processor to optimize for, one of:
64clhelp:/favor:<blend|AMD64|INTEL64|ATOM> select processor to optimize for, one of:

Overlaying the first attached change fixed detection for this particular
compiler, but I have not checked compatibility with older versions.  Do you
have VS 2008 and/or VS 2010 handy?  Having worked around that, the build
eventually failed like this:

     Creating library Debug\postgres\postgres.lib and object Debug\postgres\postgres.exp
postgres.exp : error LNK2001: unresolved external symbol _xmm@41f00000000000000000000000000000
[c:\cygwin\home\nm\src\pg\postgresql\postgres.vcxproj]
postgres.exp : error LNK2001: unresolved external symbol _xmm@80000000000000008000000000000000
[c:\cygwin\home\nm\src\pg\postgresql\postgres.vcxproj]
postgres.exp : error LNK2001: unresolved external symbol _xmm@80000000800000008000000080000000
[c:\cygwin\home\nm\src\pg\postgresql\postgres.vcxproj]
.\Debug\postgres\postgres.exe : fatal error LNK1120: 3 unresolved externals
[c:\cygwin\home\nm\src\pg\postgresql\postgres.vcxproj]
  The command exited with code 1120.
Done executing task "Link" -- FAILED.

This compiler emits _xmm symbols automatically, where needed.  The second
attached change lets the build complete and pass tests, but I can't readily
explain why it's necessary.  In the 64-bit build, the _xmm symbols export
normally (albeit, I presume, needlessly).  I hoped to find some rationale for
the preexisting gendef.pl exclusion of _real, which seems to resemble _xmm in
origin and use.  Magnus/anyone, can you shed light on our exclusion of "_real"
symbols from .def files?

In any event, if these incremental changes seem sane to you, please merge them
into your next version.

nm