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auto merge of #15698 : Zoxc/rust/code-model, r=alexcrichton 

The default code model is usually unsuitable for kernels,
so we add an option to specify which model we want.

Testing for this would be fragile and very architecture specific and is better left to LLVM.
This commit is contained in:
bors 2014-07-17 12:11:19 +00:00
parent 9fc8394d3b 0a31060815
commit dd348b3ab0
2 changed files with 19 additions and 1 deletions
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18
src/librustc/back/link.rs
View File

@ -186,6 +186,22 @@ pub mod write {
}
};
let code_model = match sess.opts.cg.code_model.as_slice() {
"default" => llvm::CodeModelDefault,
"small" => llvm::CodeModelSmall,
"kernel" => llvm::CodeModelKernel,
"medium" => llvm::CodeModelMedium,
"large" => llvm::CodeModelLarge,
_ => {
sess.err(format!("{} is not a valid code model",
sess.opts
.cg
.code_model).as_slice());
sess.abort_if_errors();
return;
}
};
let tm = sess.targ_cfg
.target_strs
.target_triple
@ -195,7 +211,7 @@ pub mod write {
target_feature(sess).with_c_str(|features| {
llvm::LLVMRustCreateTargetMachine(
t, cpu, features,
llvm::CodeModelDefault,
code_model,
reloc_model,
opt_level,
true /* EnableSegstk */,

2
src/librustc/driver/config.rs
View File

@ -336,6 +336,8 @@ cgoptions!(
"disable the use of the redzone"),
relocation_model: String = ("pic".to_string(), parse_string,
"choose the relocation model to use (llc -relocation-model for details)"),
code_model: String = ("default".to_string(), parse_string,
"choose the code model to use (llc -code-model for details)"),
metadata: Vec<String> = (Vec::new(), parse_list,
"metadata to mangle symbol names with"),
extra_filename: String = ("".to_string(), parse_string,