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Auto merge of #35821 - nbaksalyar:solaris-trans-fix, r=alexcrichton

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Fix linker on Solaris/Illumos

This patch provides a fix for the `GnuLinker::export_symbols` function that currently relies on a `--retain-symbols-file` option which is not supported by the Solaris & Illumos linker.

Instead, a [version script](https://www.gnu.org/software/gnulib/manual/html_node/LD-Version-Scripts.html) is used on this platform to achieve the same goal. Here's an example of a similar approach in LLVM's CMake script: https://github.com/llvm-mirror/llvm/blob/master/cmake/modules/AddLLVM.cmake#L88-L94.

Perhaps other platforms like OpenBSD could benefit from this as well. /cc @semarie
This commit is contained in:
bors 2016-08-21 22:30:46 -07:00 committed by GitHub
commit c44534ef5a
1 changed files with 40 additions and 20 deletions
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60
src/librustc_trans/back/linker.rs
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@ -247,29 +247,49 @@ impl<'a> Linker for GnuLinker<'a> {
return
}
let path = tmpdir.join("list");
let prefix = if self.sess.target.target.options.is_like_osx {
"_"
} else {
""
};
let res = (|| -> io::Result<()> {
let mut f = BufWriter::new(File::create(&path)?);
for sym in &self.info.cdylib_exports {
writeln!(f, "{}{}", prefix, sym)?;
}
Ok(())
})();
if let Err(e) = res {
self.sess.fatal(&format!("failed to write lib.def file: {}", e));
}
let mut arg = OsString::new();
if self.sess.target.target.options.is_like_osx {
arg.push("-Wl,-exported_symbols_list,");
let path = tmpdir.join("list");
if self.sess.target.target.options.is_like_solaris {
let res = (|| -> io::Result<()> {
let mut f = BufWriter::new(File::create(&path)?);
writeln!(f, "{{\n global:")?;
for sym in &self.info.cdylib_exports {
writeln!(f, " {};", sym)?;
}
writeln!(f, "\n local:\n *;\n}};")?;
Ok(())
})();
if let Err(e) = res {
self.sess.fatal(&format!("failed to write version script: {}", e));
}
arg.push("-Wl,-M,");
arg.push(&path);
} else {
arg.push("-Wl,--retain-symbols-file=");
let prefix = if self.sess.target.target.options.is_like_osx {
"_"
} else {
""
};
let res = (|| -> io::Result<()> {
let mut f = BufWriter::new(File::create(&path)?);
for sym in &self.info.cdylib_exports {
writeln!(f, "{}{}", prefix, sym)?;
}
Ok(())
})();
if let Err(e) = res {
self.sess.fatal(&format!("failed to write lib.def file: {}", e));
}
if self.sess.target.target.options.is_like_osx {
arg.push("-Wl,-exported_symbols_list,");
} else {
arg.push("-Wl,--retain-symbols-file=");
}
arg.push(&path);
}
arg.push(&path);
self.cmd.arg(arg);
}
}