Add TargetOption::force_pic_relocation_model and use it for mips64

src/librustc_back/target/mips64_unknown_linux_gnuabi64.rs

@@ -32,6 +32,9 @@ pub fn target() -> TargetResult {
  // see #36994
  exe_allocation_crate: None,
 
+ // see #49421
+ force_pic_relocation_model: true,
+
  ..super::linux_base::opts()
  },
  })

src/librustc_back/target/mips64el_unknown_linux_gnuabi64.rs

@@ -32,6 +32,9 @@ pub fn target() -> TargetResult {
  // see #36994
  exe_allocation_crate: None,
 
+ // see #49421
+ force_pic_relocation_model: true,
+
  ..super::linux_base::opts()
  },
  })

src/librustc_back/target/mod.rs

@@ -478,6 +478,9 @@ pub struct TargetOptions {
 
  /// Whether or not bitcode is embedded in object files
  pub embed_bitcode: bool,
+
+ /// This target requires everything to be compiled with pic reloc model.
+ pub force_pic_relocation_model: bool,
 }
 
 impl Default for TargetOptions {
@@ -550,6 +553,7 @@ impl Default for TargetOptions {
  codegen_backend: "llvm".to_string(),
  default_hidden_visibility: false,
  embed_bitcode: false,
+ force_pic_relocation_model: false,
  }
  }
 }
@@ -799,6 +803,7 @@ impl Target {
  key!(codegen_backend);
  key!(default_hidden_visibility, bool);
  key!(embed_bitcode, bool);
+ key!(force_pic_relocation_model, bool);
 
  if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
  for name in array.iter().filter_map(|abi| abi.as_string()) {
@@ -1002,6 +1007,7 @@ impl ToJson for Target {
  target_option_val!(codegen_backend);
  target_option_val!(default_hidden_visibility);
  target_option_val!(embed_bitcode);
+ target_option_val!(force_pic_relocation_model);
 
  if default.abi_blacklist != self.options.abi_blacklist {
  d.insert("abi-blacklist".to_string(), self.options.abi_blacklist.iter()

src/librustc_trans/back/write.rs

@@ -154,6 +154,14 @@ fn get_llvm_opt_size(optimize: config::OptLevel) -> llvm::CodeGenOptSize {
  }
 }
 
+fn get_llvm_reloc_model(sess: &Session) -> llvm::RelocMode {
+ if sess.target.target.options.force_pic_relocation_model {
+ llvm::RelocMode::PIC
+ } else {
+ get_reloc_model(sess)
+ }
+}
+
 pub fn create_target_machine(sess: &Session) -> TargetMachineRef {
  target_machine_factory(sess)().unwrap_or_else(|err| {
  llvm_err(sess.diagnostic(), err).raise()
@@ -163,7 +171,7 @@ pub fn create_target_machine(sess: &Session) -> TargetMachineRef {
 pub fn target_machine_factory(sess: &Session)
  -> Arc<Fn() -> Result<TargetMachineRef, String> + Send + Sync>
 {
- let reloc_model = get_reloc_model(sess);
+ let reloc_model = get_llvm_reloc_model(sess);
 
  let opt_level = get_llvm_opt_level(sess.opts.optimize);
  let use_softfp = sess.opts.cg.soft_float;