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    <p>When passing in "stream" instead I get<br>
    </p>
    <p>error: non-const lvalue reference to type
      'llvm::raw_pwrite_stream' cannot bind to a value of unrelated type
      'llvm::raw_string_ostream'</p>
    <p>I am not sure what else to try.<br>
    </p>
    <p>Frank<br>
    </p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 4/14/20 10:27 PM, Craig Topper
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAF7ks-M59dhcUDvxnNV0dqO1LaHs2owJFqgHXkWFW9aR5PCF8Q@mail.gmail.com">
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      <div dir="ltr">I think buffer_ostream has an internal buffer that
        doesn't flush until its destructor runs. What happens 
        <div>if you just pass "stream" instead of pstream?</div>
        <div><br clear="all">
          <div>
            <div dir="ltr" class="gmail_signature"
              data-smartmail="gmail_signature">~Craig</div>
          </div>
          <br>
        </div>
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      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Tue, Apr 14, 2020 at 7:08
          PM Frank Winter via llvm-dev <<a
            href="mailto:llvm-dev@lists.llvm.org" moz-do-not-send="true">llvm-dev@lists.llvm.org</a>>
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I
          can use llc to compile my IR module to amdgcn with some
          non-zero <br>
          output. However, if try to write the output (assembly or
          object) to a <br>
          string (via buffer_ostream) the resulting string has always
          zero length. <br>
          Here the code changes I do:<br>
          <br>
          Original llc:<br>
          <br>
                 if (Target->addPassesToEmitFile(PM, *OS,<br>
                                                 DwoOut ?
          &DwoOut->os() : nullptr,<br>
                                                 FileType, NoVerify,
          MMIWP))<br>
          <br>
          <br>
          Now, with this tiny change I was hoping to write to a string
          instead of <br>
          the output stream defined by the command line parameters:<br>
          <br>
          std::string outStr;<br>
          raw_string_ostream stream(outStr);<br>
          buffer_ostream pstream(stream);<br>
          if (Target->addPassesToEmitFile(PM, pstream,<br>
                                               DwoOut ?
          &DwoOut->os() : nullptr,<br>
                                               FileType, NoVerify,
          MMIWP))<br>
          <br>
          <br>
          later, e.g., after PM.run(*M), I check the string for content
          with<br>
          <br>
          WithColor::warning(errs(), argv[0]) << "with flush,
          output size: " << <br>
          outStr.length() << "\n";<br>
          <br>
          <br>
          But this always yields "with flush, output size: 0"<br>
          <br>
          I tried to flush the raw_string_ostream before using the
          string, same <br>
          result.<br>
          <br>
          The used command line was<br>
          <br>
          llc -march=amdgcn -mcpu=gfx906 < module.ll<br>
          <br>
          <br>
          Anyone see what's wrong with the code?<br>
          <br>
          <br>
          Frank<br>
          <br>
          <br>
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        </blockquote>
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