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Your cl::opt definition seems correct but the definition from
llc.cpp is not visible in X86ISelLowring.cpp. The general practice
is to define the cl::opt variable in the file you want to use it in.
So you could try moving the definition to X86ISelLowering.cpp.<br>
<br>
<div class="moz-cite-prefix">On 7/21/2017 10:17 AM, hameeza ahmed
via llvm-dev wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFMPKeaKG9UFvoYydbGNW4c=BM-umtVgqiDjXeqcseDHoE9kSQ@mail.gmail.com">
<div dir="ltr">Thank you.
<div>I want to define a flag -optt-enabled in llc so i wrote
following line in llc.cpp:</div>
<div><br>
</div>
<div>
<div>static cl::opt<bool></div>
<div>OPPT("oppt-enabled", cl::desc("Enables Optimization"),
cl::init(false));</div>
</div>
<div><br>
</div>
<div>Now i want to check its value in x86isellwering.cpp</div>
<div>there i wrote:</div>
<div><br>
</div>
<div>
<div> if (OPPT)</div>
<div> {addRegisterClass(.............)</div>
</div>
<div>}</div>
<div>but getting the error</div>
<div><br>
</div>
<div> use of undeclared identifier 'OPPT'<br>
</div>
<div><br>
</div>
<div>Could someone tell me where i am mistaken? what else do i
need to define.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Jul 21, 2017 at 2:33 PM, Diana
Picus <span dir="ltr"><<a
href="mailto:diana.picus@linaro.org" target="_blank"
moz-do-not-send="true">diana.picus@linaro.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
You can find plenty of examples (including in the
vectorizer) if you<br>
grep for cl::opt.<br>
The docs are here:<br>
<a href="https://llvm.org/docs/CommandLine.html"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://llvm.org/docs/<wbr>CommandLine.html</a><br>
<br>
Hope that helps,<br>
Diana<br>
<br>
On 21 July 2017 at 10:47, hameeza ahmed via llvm-dev<br>
<div>
<div class="h5"><<a
href="mailto:llvm-dev@lists.llvm.org"
moz-do-not-send="true">llvm-dev@lists.llvm.org</a>>
wrote:<br>
> Hello.<br>
><br>
> I need to introduce a new flag in llc command like
llc -mV to control the<br>
> vectorization. How can I achieve this??<br>
><br>
><br>
> Please help.<br>
><br>
> Thank You<br>
><br>
</div>
</div>
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</blockquote>
</div>
<br>
</div>
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