New Video on Solaris Studio and Solaris 11 Express



Don Kretsch and I talk to Rick Ramsey about Solaris Studio. The parallel event that I presented Studio at was LISA 2010 where Solaris 11 Express was introduced in a full-day summit to SysAdmins (you can find all the slides here) . Don and I talk about optimizing for Oracle Sun systems, being the compiler/tool of choice for a significant part of Oracle stack (DB, Peoplesoft, Siebel, JD Edwards, Hyperion, Java, NetBeans are all built using Studio) and how Studio uses and supports Solaris 11 Express features.

Rick was particularly fascinated about the Application Binary Compatibility Guarantee that Studio + Solaris help to deliver, so we spent quite a bit of time on it. Its unique in the industry that binaries built on several previous releases of Solaris (from Solaris 2.6 and up) and with Studio compilers, will continue to run on newer versions of Solaris. Not only is that invaluable in quickly getting the applications requalified on a new platform- like Solaris 11 Express- but it also provides for a gentler migration path in upgrading to newer version of the OS and/or compilers. The C ABI, of course, hasnt changed since SVR4 adoption and the C++ ABI hasnt changed since the ANSI C++ standard was adopted/ratified. [Good news is that its not likely that the new standard will require incompatibilities to be introduced]

I wanted to add this bit, because of some confusion wrt what constitutes an ABI (as in the comment below, or at least my interpretation of it). For C++, the guarantee is that if you use the earlier versions of the Sun (Studio) C++ compiler and earlier versions of Solaris, you can mix that code with later versions of the Sun Studio C++ compiler and later versions of Solaris. eg. you compile a library with Sun Studio 8 on Solaris 8; you can link that library into applications compiled with Sun Studio 12.2 (latest) and Solaris 11 Express (latest). For Sun Studio, ABI is a combination of compiler and stdlib. For this reason, Sun has not upgraded the default stdlib (still based on Roguewave stdlib2.0.1). This means some features are missing, but it guarantees that applications will continue to work in an upward compatible fashion. In order to offer new features, we recommend STLport4 and the latest Apache Stdlib (STLport4 is part of the compiler release, you can use -library=stlport4 to get to it; in the case of Apache, its in the repository and/or companion CD). Thus users have to make a call: build for compatibility using old library or use the latest features and not have compatible binaries. Most corporate customers and ISVs prefer to stick to the compatible solution. Which is the default.

Comments:

Hmm, yes the C++ ABI didn't change, as long as you only consider the pure language and not the standard library (Cstd->stlport4->stdcxx and it will have to change again for C++0x since none of those are maintained upstream anymore, and C++0X forces incompatible changes on the library anyway). And the ABI used differs on x86_64 because the one used on the other systems doesn't allow to implement the standard faithfully. And this compiler is one of the least conforming to the standard out there.
The compatibility exists (and that's good), but it is not as miraculous as one might believe.

Posted by Marc on November 17, 2010 at 03:07 PM PST #

Please see the added comments above. I hope that helps to clarify the situation.
Yes, in C++, over the years, compiler providers had to make a call between compatibility and library features. Sun chose the compatibility by default and offered the other via option.
As for x86 and x64, there are no differences on Sun Studio and Solaris. All features are equally available on both. Of course, the calling conventions are different between 32 and 64 bit (as are other system differences), so you cant mix 32 and 64 bit objects.
Which C++ language features in the current standard require 64bit support and do not work on 32bits?
And yes, I agree on the last point. Compat is not all that important to everyone, but it is extremely key to corporate customers/ISVs.

Posted by Vijay Tatkar on November 18, 2010 at 01:03 AM PST #

Hello,

for x86 vs x64 (actually I don't remember exactly what uses what, I believe linux has the modern one for x86 too), see -Qoption ccfe -abiopt=mangle6.

Posted by Marc on November 18, 2010 at 07:01 PM PST #

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I have worked with Sun and Oracle for 25 years now; in compilers and tools organization for most of these years followed by a couple of years in Cloud Computing. I am now in ISV Engineering, where our primary task is to improve synergy between Oracle Sun Systems and our rich ISV ecosystem

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