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| | require 'mkmf'
dir_config('atomic_ops')
have_func('mmap', 'sys/mman.h') or abort 'mmap() not found'
have_func('munmap', 'sys/mman.h') or abort 'munmap() not found'
$CPPFLAGS += " -D_GNU_SOURCE "
have_func('mremap', 'sys/mman.h')
$CPPFLAGS += " -D_BSD_SOURCE -D_XOPEN_SOURCE=600 "
have_func("getpagesize", "unistd.h")
have_func('rb_thread_blocking_region')
have_func('rb_thread_io_blocking_region')
checking_for "GCC 4+ atomic builtins" do
src = <<SRC
int main(int argc, char * const argv[]) {
volatile unsigned long i = 0;
__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
$defs.push(format("-DHAVE_GCC_ATOMIC_BUILTINS"))
true
else
false
end
end or have_header('atomic_ops.h') or abort <<-SRC
libatomic_ops is required if GCC 4+ is not used.
See http://www.hpl.hp.com/research/linux/atomic_ops/
Users of Debian-based distros may run:
apt-get install libatomic-ops-dev
SRC
create_makefile('raindrops_ext')
|