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Make symbols stripping work on MacOS X

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As reported in the stabilization issue, MacOS' linker doesn't support the `-s` and `-S` flags to strip symbols anymore. However, the os ships a separated tool to perform these operations.

This change allows the compiler to use that tool after a target has been compiled to strip symbols.

For rationale, see: https://github.com/rust-lang/rust/issues/72110#issuecomment-641169818
For option selection, see: https://www.unix.com/man-page/osx/1/strip/

Signed-off-by: David Calavera <david.calavera@gmail.com>
This commit is contained in:
David Calavera 2021-02-12 10:24:16 -08:00
parent 9d9c2c92b8
commit df0fc6daee
2 changed files with 49 additions and 13 deletions
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51
compiler/rustc_codegen_ssa/src/back/link.rs
View File

@ -5,7 +5,7 @@ use rustc_fs_util::fix_windows_verbatim_for_gcc;
use rustc_hir::def_id::CrateNum;
use rustc_middle::middle::cstore::{EncodedMetadata, LibSource};
use rustc_middle::middle::dependency_format::Linkage;
use rustc_session::config::{self, CFGuard, CrateType, DebugInfo};
use rustc_session::config::{self, CFGuard, CrateType, DebugInfo, Strip};
use rustc_session::config::{OutputFilenames, OutputType, PrintRequest};
use rustc_session::output::{check_file_is_writeable, invalid_output_for_target, out_filename};
use rustc_session::search_paths::PathKind;
@ -717,14 +717,6 @@ fn link_natively<'a, B: ArchiveBuilder<'a>>(
}
}
fn escape_string(s: &[u8]) -> String {
str::from_utf8(s).map(|s| s.to_owned()).unwrap_or_else(|_| {
let mut x = "Non-UTF-8 output: ".to_string();
x.extend(s.iter().flat_map(|&b| ascii::escape_default(b)).map(char::from));
x
})
}
match prog {
Ok(prog) => {
if !prog.status.success() {
@ -866,6 +858,47 @@ fn link_natively<'a, B: ArchiveBuilder<'a>>(
// ... and otherwise we're processing a `*.dwp` packed dwarf file.
SplitDebuginfo::Packed => link_dwarf_object(sess, &out_filename),
}
if sess.target.is_like_osx {
if let Some(option) = osx_strip_opt(sess.opts.debugging_opts.strip) {
strip_symbols_in_osx(sess, &out_filename, option);
}
}
}
fn strip_symbols_in_osx<'a>(sess: &'a Session, out_filename: &Path, option: &str) {
let prog = Command::new("strip").arg(option).arg(out_filename).output();
match prog {
Ok(prog) => {
if !prog.status.success() {
let mut output = prog.stderr.clone();
output.extend_from_slice(&prog.stdout);
sess.struct_warn(&format!(
"stripping debug info with `strip` failed: {}",
prog.status
))
.note(&escape_string(&output))
.emit();
}
}
Err(e) => sess.fatal(&format!("unable to run `strip`: {}", e)),
}
}
fn osx_strip_opt<'a>(strip: Strip) -> Option<&'a str> {
match strip {
Strip::Debuginfo => Some("-S"),
Strip::Symbols => Some("-x"),
Strip::None => None,
}
}
fn escape_string(s: &[u8]) -> String {
str::from_utf8(s).map(|s| s.to_owned()).unwrap_or_else(|_| {
let mut x = "Non-UTF-8 output: ".to_string();
x.extend(s.iter().flat_map(|&b| ascii::escape_default(b)).map(char::from));
x
})
}
fn link_sanitizers(sess: &Session, crate_type: CrateType, linker: &mut dyn Linker) {

11
compiler/rustc_codegen_ssa/src/back/linker.rs
View File

@ -482,15 +482,18 @@ impl<'a> Linker for GccLinker<'a> {
fn control_flow_guard(&mut self) {}
fn debuginfo(&mut self, strip: Strip) {
// MacOS linker doesn't support stripping symbols directly anymore.
if self.sess.target.is_like_osx {
return;
}
match strip {
Strip::None => {}
Strip::Debuginfo => {
// MacOS linker does not support longhand argument --strip-debug
self.linker_arg("-S");
self.linker_arg("--strip-debug");
}
Strip::Symbols => {
// MacOS linker does not support longhand argument --strip-all
self.linker_arg("-s");
self.linker_arg("--strip-all");
}
}
}