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<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">Hi Sam,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">I think this feature is useful and there is an alternative solution under review here:
</span><a href="https://reviews.llvm.org/D23712"><span lang="EN-US" style="mso-fareast-language:EN-US">https://reviews.llvm.org/D23712</span></a><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">This solution introduces new command line option to enable/disable supported OpenCL extensions. This approach doesn’t overload meaning of –D and –U option and allows controlling
all extensions at once: enable/disable all.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Alexey<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Liu, Yaxun (Sam) [mailto:Yaxun.Liu@amd.com]
<br>
<b>Sent:</b> Monday, September 19, 2016 11:46 PM<br>
<b>To:</b> cfe-dev (cfe-dev@lists.llvm.org) <cfe-dev@lists.llvm.org>; 'anastasia.stulova@arm.com' <anastasia.stulova@arm.com>; Bader, Alexey <alexey.bader@intel.com><br>
<b>Cc:</b> Morichetti, Laurent <Laurent.Morichetti@amd.com>; Sumner, Brian <Brian.Sumner@amd.com><br>
<b>Subject:</b> [RFC] OpenCL: Allow enabling/disabling an extension by command line options<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Currently Clang defines supported OpenCL extensions for each target, and there is a feature under review for defining supported extensions in header files.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">OpenCL runtime needs a flexible way to define supported extensions for a device in a specific environment. It is desirable to be able to enable/disable support of an extension by command line options.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">One possible solution is to use -D and -U followed by the name of an extension to enable or disable support of the extension.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">There may be multiple -D and -U options, each of which is followed by the name of an extension.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Basically, when Clang decides whether an extension is supported, it not only uses Target information, but also checks if the macro with the same name is defined or undefined.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Your feedback is welcome.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Sam<o:p></o:p></span></p>
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