Bug #68114 [Fbk->Asn]: Build fails with gcc: Undefined symbols: ___extendsddf ___extendsfsd

From: Date: Fri, 24 Oct 2014 23:23:03 +0000
Subject: Bug #68114 [Fbk->Asn]: Build fails with gcc: Undefined symbols: ___extendsddf ___extendsfsd
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=68114&edit=1

 ID:                 68114
 User updated by:    php-bugs-2014 at ryandesign dot com
 Reported by:        php-bugs-2014 at ryandesign dot com
 Summary:            Build fails with gcc: Undefined symbols:
                     ___extendsddf ___extendsfsd
-Status:             Feedback
+Status:             Assigned
 Type:               Bug
 Package:            MySQL related
 Operating System:   OS X
 PHP Version:        5.5.17
 Assigned To:        keyur
 Block user comment: N
 Private report:     N

 New Comment:

I'd like to try the snapshot, but snaps.php.net has been down for days.

"This service is unavailable at the moment. Please try again in a day"


Previous Comments:
------------------------------------------------------------------------
[2014-10-20 16:57:48] keyur@php.net

Please try using this snapshot:

  http://snaps.php.net/php-trunk-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/



------------------------------------------------------------------------
[2014-10-20 16:57:28] keyur@php.net

Ah I just repeated a bunch of what you said :) Should've read the full email thread before
replying. 

I am marking the bug again as "Try a snapshot".

------------------------------------------------------------------------
[2014-10-20 16:54:33] keyur@php.net

Hello all,

Let me clarify a couple things. Decimal32/64 is not supported by Clang http://clang.llvm.org/docs/UsersManual.html#gcc-extensions-not-implemented-yet
so OS X doesn't support it.

I am not sure what is up with the GCC. The version I used (i686-apple-darwin10-gcc-4.2.1) you can
see it compiles but doesn't link.

The fix is not yet released. It is queued up for 5.5.19
(https://github.com/php/php-src/blob/PHP-5.5/NEWS) and 5.6.3
(https://github.com/php/php-src/blob/PHP-5.6/NEWS)

If it still doesn't resolve, please re-open this bug.

------------------------------------------------------------------------
[2014-10-10 11:16:17] php-bugs-2014 at ryandesign dot com

I've learned that clang does not support decimal floating point types at all:

http://clang.llvm.org/docs/UsersManual.html#gcc-extensions-not-implemented-yet

"clang does not support decimal floating point types (_Decimal32 and friends) or fixed-point
types (_Fract and friends); nobody has expressed interest in these features yet, so it’s hard
to say when they will be implemented."

And gcc only enables support for decimal floating point types by default on Linux, not OS X:

https://gcc.gnu.org/install/configure.html

"This is enabled by default only on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems
may also support it, but require the user to specifically enable it."

The Apple build of gcc 4.2.1 in Xcode doesn't use the --enable-decimal-float flag, according to
"gcc -v", and neither do the newer gcc versions available in MacPorts. I don't know
whether that's due to oversight or ignorance, or whether it was tried and found not to work.

But I think this answers my question: yes it is expected that decimal floating point is not
available on OS X, so using ac_cv_decimal_fp_supported=no is a reasonable workaround for now.

As for fixing the configure script to detect this, perhaps "-O0" can be appended to the
CFLAGS for the duration of this test.

------------------------------------------------------------------------
[2014-10-09 12:26:50] php at deguest dot asia

Thank you, the solution of using this argument worked.
I am just a bit puzzled that Mac would not recognise decimal floating point. Seems a bit weird.

Jacques

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