[llvm-bugs] [Bug 28143] New: Redefinition of 'tan' provokes assert

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28143

            Bug ID: 28143
           Summary: Redefinition of 'tan' provokes assert
           Product: new-bugs
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: carlo.bertolli at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

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.

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