-std=c99 still defines 'index()' legacy posix function

[llvmbot]

Bugzilla Link	16138
Resolution	FIXED
Resolved on	May 31, 2013 11:58
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@d0k

Extended Description

When I use clang to compile this file:

#include <stdio.h>

int index; // this is the line causing problem.
int main(int argc, char **argv)
{
    puts("hello");
    return 0;
}

I got the error: redefinition of 'index' as different kind of symbol.

It turns out that index is one deprecated one function in posix.

Using gcc -std=c99 fixes the problem, but clang -std=c99 doesn't do the trick.

Is this because index() is still defined in c99?

[d0k]

r183015 disables builtin definitions for non-standard functions like index().

[llvmbot]

Add the link to that revision:

r183015

PS: Thanks for the quick fix.

[zygoloid]

mentioned in issue llvm/llvm-bugzilla-archive#19207