[LLVMdev] linux build broken on Ubuntu 12.04 x86_64

[Todd Fiala]

Thanks, Adam.

I came to the same conclusion and I just put up a patch for review to
handle this a moment ago on llvm-commits.

The patch might need to be tweaked to coordinate on the variable name
change that occurred due to the changed configure mechanism.  I'm looking
at that now.


On Tue, Feb 4, 2014 at 3:56 PM, Adam Strzelecki <ono at java.pl> wrote:

> Huh, I have just hit this issue today’s morning.
>
> > Maybe a machine change? Let's take this off list for now and we can
> update when we figure it out. I can't duplicate it.
>
> This issue happens only if libedit-dev is installed on Ubuntu 12.04. This
> leads configure to false detect HAVE_ARC4RANDOM, because libedit is being
> tested before arc4random, and libedit.so depends on libbsd.so. This makes
> arc4random check succeed, even arc4random is not declared anywhere, as
> plain C just assumes function existence (no args returning int), then it
> links with -ledit which succeeds.
>
> So I am seeing two possible solutions:
>
> (1) either move libedit check after arc4random, so arc4random is checked
> without -ledit
> (2) make sure arc4random check if function is actually declared, and fail
> instead assuming it exists and returns int
>
> Cheers,
> --
> Adam




-- 
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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