<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Redefinition of 'tan' provokes assert"
   href="https://llvm.org/bugs/show_bug.cgi?id=28143">28143</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Redefinition of 'tan' provokes assert
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>carlo.bertolli@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The following program:

extern int tan (void);


int main (void) {
  tan();
  return 0;
}

Compiled with:

clang t53.c -O

Returns the following assert
clang-3.9: /localhd/cbertol/trunk/src/include/llvm/IR/Instructions.h:1554:
llvm::Value *llvm::CallInst::getArgOperand(unsigned int) const: Assertion `i <
getNumArgOperands() && "Out of bounds!"' failed.

It looks like that llvm is trying to simplify 'tan' as if it were the math.h
declaration, and not the re-declaration.

Compiled on bare-metal ubuntu on power 8 with:
llvm a94e734
clang e03851a

Using clang 3.8.1 does not result in error, but linking error as 'tan' is not
defined.</pre>
        </div>
      </p>
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