67 lines
3.1 KiB
Rust
67 lines
3.1 KiB
Rust
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// Copyright 2014 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 target::TargetOptions;
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use std::default::Default;
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pub fn opts() -> TargetOptions {
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TargetOptions {
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// FIXME(#13846) this should be enabled for windows
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function_sections: false,
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linker: "gcc".to_string(),
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dynamic_linking: true,
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executables: true,
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dll_prefix: "".to_string(),
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dll_suffix: ".dll".to_string(),
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exe_suffix: ".exe".to_string(),
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staticlib_prefix: "".to_string(),
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staticlib_suffix: ".lib".to_string(),
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morestack: false,
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is_like_windows: true,
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pre_link_args: vec!(
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// And here, we see obscure linker flags #45. On windows, it has been
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// found to be necessary to have this flag to compile liblibc.
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//
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// First a bit of background. On Windows, the file format is not ELF,
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// but COFF (at least according to LLVM). COFF doesn't officially allow
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// for section names over 8 characters, apparently. Our metadata
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// section, ".note.rustc", you'll note is over 8 characters.
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//
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// On more recent versions of gcc on mingw, apparently the section name
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// is *not* truncated, but rather stored elsewhere in a separate lookup
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// table. On older versions of gcc, they apparently always truncated th
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// section names (at least in some cases). Truncating the section name
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// actually creates "invalid" objects [1] [2], but only for some
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// introspection tools, not in terms of whether it can be loaded.
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//
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// Long story short, passing this flag forces the linker to *not*
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// truncate section names (so we can find the metadata section after
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// it's compiled). The real kicker is that rust compiled just fine on
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// windows for quite a long time *without* this flag, so I have no idea
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// why it suddenly started failing for liblibc. Regardless, we
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// definitely don't want section name truncation, so we're keeping this
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// flag for windows.
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//
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// [1] - https://sourceware.org/bugzilla/show_bug.cgi?id=13130
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// [2] - https://code.google.com/p/go/issues/detail?id=2139
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"-Wl,--enable-long-section-names".to_string(),
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// Tell GCC to avoid linker plugins, because we are not bundling
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// them with Windows installer, and Rust does its own LTO anyways.
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"-fno-use-linker-plugin".to_string(),
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// Always enable DEP (NX bit) when it is available
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"-Wl,--nxcompat".to_string(),
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),
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.. Default::default()
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}
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}
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