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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Using 'clang -target …-darwin10.10 …' or configuring LLVM's default triple at configure-time (-DLLVM_DEFAULT_TARGET_TRIPLE=…-darwin10.10 for CMake) should work. I do the
latter for MIPS32 toolchains on a MIPS64 host.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> llvm-dev [mailto:llvm-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Benoit Belley via llvm-dev<br>
<b>Sent:</b> 24 September 2015 18:48<br>
<b>To:</b> llvm-dev@lists.llvm.org<br>
<b>Cc:</b> Ian Ameline; Eric Bourque<br>
<b>Subject:</b> [llvm-dev] TargetTriple issue: LC_VERSION_MIN_MACOSX: Darwin kernel version vs SDK version<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hi everyone,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I just reported the following issue: <a href="https://llvm.org/bugs/show_bug.cgi?id=24927">https://llvm.org/bugs/show_bug.cgi?id=24927</a><o:p></o:p></span></p>
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<pre style="white-space:pre-wrap" id="comment_text_0"><span style="font-family:"Calibri","sans-serif";color:black">Using the Xcode 7 linker, one gets messages such as the following when linking objects generated using llvm:<o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
<pre><b><i><span style="font-family:"Calibri","sans-serif";color:black">ld: warning: object file (foo.o) was built for newer OS X version (14.5) than being linked (10.9)</span></i></b><span style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black">The issue is the following:<o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black">a) In lib/Support/Unix/Host.inc, sys::getDefaultTargetTriple() sets the OS name to darwin14.5 when running on MaxOS X 10.10. 14.5 is the Darwin kernel version as reported by uname.<o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black">b) In lib/CodeGen/AsmPrinter.cpp, AsmPrinter::doInitialization() writes out this version number to the LC_VERSION_MIN_MACOSX of the generated object.<o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black">c) The XCode 7 linker seems to expect that LC_VERSION_MIN_MACOSX contains the minimum version number of the MacOS X SDK (10.9, 10.11, ...), NOT the Darwin kernel version number! <o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
<pre><b><i><span style="font-family:"Calibri","sans-serif";color:black">AFAICT, LLVM had this wrong behaviour for a long time. The only new thing with Xcode 7 is that the linker is now reporting a warning for the version mismatch.</span></i></b><span style="color:black"><o:p></o:p></span></pre>
<pre style="white-space:pre-wrap" id="comment_text_0"><span style="font-family:"Calibri","sans-serif";color:black">As a workaround, we are temporarily stripping out the darwin kernel version number from the triple in our project code. Something like:</span><span style="color:black"><o:p></o:p></span></pre>
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<pre style="white-space:pre-wrap" id="comment_text_1"><span style="font-size:9.0pt;font-family:Consolas;color:black">// FIXME: LLVM confuses Darwin Kernel version numbers with MacOS X SDK<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">// version. By stripping out the kernel version number, we prevent the<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">// LC_VERSION_MIN_MACOSX directive from being emitted. Hopefully, that<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">// will get fixed by LLVM 3.8...<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">//<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">// See LLVM bug 24927: <a href="https://llvm.org/bugs/show_bug.cgi?id=24927#if">https://llvm.org/bugs/show_bug.cgi?id=24927#if</a> defined(OSX)<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">#if (LLVM_VERSION_MAJOR < 3) || ((LLVM_VERSION_MAJOR == 3) && (LLVM_VERSION_MINOR < 8 ))<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black"> triple = Triple(triple.getArchName(),<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black"> triple.getVendorName(),<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black"> "darwin",<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black"> triple.getEnvironmentName());<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">#endif<o:p></o:p></span></pre>
<pre><span style="font-size:9.0pt;font-family:Consolas;color:black">#endif</span><span style="color:black"><o:p></o:p></span></pre>
<pre style="white-space:pre-wrap" id="comment_text_1"><span style="font-family:"Calibri","sans-serif";color:black">This prevents the LC_VERSION_MIN_MACOSX directives from being emitted into the LLVM generated object files.</span><span style="color:black"><o:p></o:p></span></pre>
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<pre style="white-space:pre-wrap" id="comment_text_1"><b><i><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:black">Any suggestions how to go about fixing LLVM to generate the correct LC_VERSION_MIN_MACOSX minimum SDK version number ? There seems to be no way to pass this information correctly through the Triple!</span></i></b><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></pre>
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<pre><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></pre>
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<pre><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:black">Thanks,<o:p></o:p></span></pre>
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<pre><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:black">Benoit<o:p></o:p></span></pre>
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