Since unicorn users are raindrops users, I''d appreciate it if
32-bit FreeBSD users can give this a try. Thanks!
ref: http://mid.gmane.org/20120510215457.GA11961 at dcvr.yhbt.net
Eric Wong <normalperson at yhbt.net> wrote:> I''ve just pushed this out to master on
git://bogomips.org/raindrops
>
> The original check for "i386" arch was causing builds on SmartOS
> to fail.
>
> Also available as a prerelease gem (0.8.0.5.g71f8):
>
> gem install --pre raindrops
>
> >From 71f80afdbcb45245a01ee2c278ebda692587e92a Mon Sep 17 00:00:00 2001
> From: Eric Wong <normalperson at yhbt.net>
> Date: Thu, 10 May 2012 14:49:39 -0700
> Subject: [PATCH] extconf: better check for GCC atomic builtins
>
> Attempting to test for CMPXCHG on x86 should allow this check to
> fail on i386 systems. We also won''t need try_run as a result,
> enabling cross-compilation. The configure.in check in Ruby
> 1.9.3 does something similar and that''s far more widely used
> than raindrops is.
> ---
> ext/raindrops/extconf.rb | 15 ++++++---------
> 1 file changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/ext/raindrops/extconf.rb b/ext/raindrops/extconf.rb
> index 9f5de95..447a90a 100644
> --- a/ext/raindrops/extconf.rb
> +++ b/ext/raindrops/extconf.rb
> @@ -13,23 +13,20 @@
have_func(''rb_thread_blocking_region'')
> have_func(''rb_thread_io_blocking_region'')
>
> checking_for "GCC 4+ atomic builtins" do
> + # we test CMPXCHG anyways even though we don''t need it to
filter out
> + # ancient i386-only targets without CMPXCHG
> src = <<SRC
> int main(int argc, char * const argv[]) {
> - volatile unsigned long i = 0;
> + unsigned long i = 0;
> + __sync_lock_test_and_set(&i, 0);
> + __sync_lock_test_and_set(&i, 1);
> __sync_add_and_fetch(&i, argc);
> __sync_sub_and_fetch(&i, argc);
> return 0;
> }
> SRC
>
> - if try_run(src)
> - # some systems target GCC for i386 and don''t get the atomic
builtins
> - # when building shared objects
> - arch = `#{CONFIG[''CC'']} -dumpmachine`.split(/-/)[0]
> - if arch == "i386" && $CFLAGS !~ /\b-march=/
> - $CFLAGS += " -march=i486 "
> - end
> -
> + if try_link(src)
> $defs.push(format("-DHAVE_GCC_ATOMIC_BUILTINS"))
> true
> else
> --
> Eric Wong