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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')
have_header('linux/tcp.h')
$CPPFLAGS += " -D_BSD_SOURCE "
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
# 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[]) {
unsigned long i = 0;
__sync_lock_test_and_set(&i, 0);
__sync_lock_test_and_set(&i, 1);
__sync_bool_compare_and_swap(&i, 0, 1);
__sync_add_and_fetch(&i, argc);
__sync_sub_and_fetch(&i, argc);
return 0;
}
SRC
if try_link(src)
$defs.push(format("-DHAVE_GCC_ATOMIC_BUILTINS"))
true
else
# some compilers still target 386 by default, but we need at least 486
# to run atomic builtins.
prev_cflags = $CFLAGS
$CFLAGS += " -march=i486 "
if try_link(src)
$defs.push(format("-DHAVE_GCC_ATOMIC_BUILTINS"))
true
else
prev_cflags = $CFLAGS
false
end
end
end or have_header('atomic_ops.h') or abort <<-SRC
libatomic_ops is required if GCC 4+ is not used.
See https://github.com/ivmai/libatomic_ops
Users of Debian-based distros may run:
apt-get install libatomic-ops-dev
SRC
create_makefile('raindrops_ext')
|