From: Nobuyoshi Nakada <nobu@...>
Date: 2006-12-20T23:50:58+09:00
Subject: Re: System V IPC in standard library?

Hi,

At Wed, 20 Dec 2006 10:22:12 +0900,
Steven Jenkins wrote in [ruby-core:09752]:
> I don't see that conftestval is used at all in have_type. But yes,
> that's the idea. The test code has no side effects, so an aggressively
> optimizing compiler can throw the whole thing away. (In this case, of
> course, the desired side effect is an error.) I looked at autoconf
> because I figured someone else would have encountered this problem
> before. Their code returns values to the environment, so it can't be so
> easily optimized away.

I was forgetting fixing it at 26 Sep, therefore 1.8.5 still has
the older test.

The current test is:

  typedef #{type} conftest_type;
  static conftest_type conftestval[sizeof(conftest_type)?1:-1];

-- 
Nobu Nakada