e3f6e68d63
This does not actually improve build times, since it still depends on rustc_trans, but is better layering and fits the multi-backend future slightly better.
45 lines
1.7 KiB
Rust
45 lines
1.7 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use syntax::ast;
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use rustc::session::Session;
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use syntax::symbol::Symbol;
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use rustc_trans;
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/// Add `target_feature = "..."` cfgs for a variety of platform
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/// specific features (SSE, NEON etc.).
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///
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/// This is performed by checking whether a whitelisted set of
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/// features is available on the target machine, by querying LLVM.
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pub fn add_configuration(cfg: &mut ast::CrateConfig, sess: &Session) {
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let tf = Symbol::intern("target_feature");
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for feat in rustc_trans::target_features(sess) {
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cfg.insert((tf, Some(feat)));
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}
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let requested_features = sess.opts.cg.target_feature.split(',');
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let found_negative = requested_features.clone().any(|r| r == "-crt-static");
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let found_positive = requested_features.clone().any(|r| r == "+crt-static");
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// If the target we're compiling for requests a static crt by default,
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// then see if the `-crt-static` feature was passed to disable that.
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// Otherwise if we don't have a static crt by default then see if the
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// `+crt-static` feature was passed.
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let crt_static = if sess.target.target.options.crt_static_default {
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!found_negative
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} else {
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found_positive
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};
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if crt_static {
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cfg.insert((tf, Some(Symbol::intern("crt-static"))));
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}
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}
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