<br><br><div class="gmail_quote">On Wed, Jul 25, 2012 at 12:24 AM, Kaylor, Andrew <span dir="ltr"><<a href="mailto:andrew.kaylor@intel.com" target="_blank">andrew.kaylor@intel.com</a>></span> wrote:<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-------------------------------</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">ELF Support on Windows</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">There are various reasons that it would be nice to be able to support generation of ELF objects on Windows through the MCJIT interface, one of which is that
it would allow users to debug JITed code with GDB (i.e. MinGW). There was a proposal by Eli Bendersky to enable ELF generation on Windows by extending the target triple handling. We have been using that approach, and it works. However, at the time it was
proposed there seemed to be a general feeling that it would be preferable to have a general way to specify a non-default object format for any platform rather than a Windows/ELF-specific extension.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The original discussion can be found here:</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120130/136053.html" target="_blank"><span style="font-size:12.0pt">http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120130/136053.html</span></a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Unfortunately, I don't believe a consensus was ever reached as to what the correct way to implement this would be. I'd like to re-open that discussion now
so that we can find a solution that would be generally accepted for inclusion in LLVM.</span></p></div></div></blockquote><div><br></div><div>I'm using this patch mentioned and it works just fine.</div><div>However, I would like to see it implemented in more generic way:</div>
<div><br></div><div>1. When a container type is explicitly specified in triple it should be used by MCJIT.</div><div>2. When a container type is not specified it is deduced from OS.</div><div>3. Use ELF by default.</div>
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<br></div><div>"Environment" part of the triple may be used to specify the container. Some options are already there (like MachO). But there may conflicts exist where both environment and container must have been specified together (e.g. "arm-apple-ios-eabi-macho").</div>
<div><br></div><div>- Paweł</div></div>