add a panic-strategy field to the target specification

Now a target can define its panic strategy in its specification. If a
user doesn't specify a panic strategy via the command line, i.e. '-C
panic', then the compiler will use the panic strategy defined by the
target specification.

Custom targets can pick their panic strategy via the "panic-strategy"
field of their target specification JSON file. If omitted in the
specification, the strategy defaults to "unwind".

closes #36647

5 files changed, 6 insertions, 6 deletions

diff --git a/src/librustc_metadata/creader.rs b/src/librustc_metadata/creader.rs
index 71cc13aebb3..be908ff9d19 100644
--- a/src/librustc_metadata/creader.rs
+++ b/src/librustc_metadata/creader.rs
@@ -18,7 +18,7 @@ use schema::CrateRoot;
 use rustc::hir::def_id::{CrateNum, DefIndex};
 use rustc::hir::svh::Svh;
 use rustc::session::{config, Session};
-use rustc::session::config::PanicStrategy;
+use rustc_back::PanicStrategy;
 use rustc::session::search_paths::PathKind;
 use rustc::middle;
 use rustc::middle::cstore::{CrateStore, validate_crate_name, ExternCrate};
@@ -710,7 +710,7 @@ impl<'a> CrateReader<'a> {
         // The logic for finding the panic runtime here is pretty much the same
         // as the allocator case with the only addition that the panic strategy
         // compilation mode also comes into play.
-        let desired_strategy = self.sess.opts.cg.panic.clone();
+        let desired_strategy = self.sess.panic_strategy();
         let mut runtime_found = false;
         let mut needs_panic_runtime = attr::contains_name(&krate.attrs,
                                                           "needs_panic_runtime");
diff --git a/src/librustc_metadata/csearch.rs b/src/librustc_metadata/csearch.rs
index 1f25136ffe1..16a5b5402fb 100644
--- a/src/librustc_metadata/csearch.rs
+++ b/src/librustc_metadata/csearch.rs
@@ -26,7 +26,7 @@ use rustc::hir::map::DefKey;
 use rustc::mir::repr::Mir;
 use rustc::mir::mir_map::MirMap;
 use rustc::util::nodemap::{NodeSet, DefIdMap};
-use rustc::session::config::PanicStrategy;
+use rustc_back::PanicStrategy;
 
 use std::path::PathBuf;
 use syntax::ast;
diff --git a/src/librustc_metadata/cstore.rs b/src/librustc_metadata/cstore.rs
index 0a1ff70a049..038d0f73d5c 100644
--- a/src/librustc_metadata/cstore.rs
+++ b/src/librustc_metadata/cstore.rs
@@ -19,7 +19,7 @@ use rustc::hir::def_id::{CRATE_DEF_INDEX, CrateNum, DefIndex, DefId};
 use rustc::hir::map::DefKey;
 use rustc::hir::svh::Svh;
 use rustc::middle::cstore::ExternCrate;
-use rustc::session::config::PanicStrategy;
+use rustc_back::PanicStrategy;
 use rustc_data_structures::indexed_vec::IndexVec;
 use rustc::util::nodemap::{FnvHashMap, NodeMap, NodeSet, DefIdMap, FnvHashSet};
 
diff --git a/src/librustc_metadata/encoder.rs b/src/librustc_metadata/encoder.rs
index 0f067270b80..ca4fb77d95a 100644
--- a/src/librustc_metadata/encoder.rs
+++ b/src/librustc_metadata/encoder.rs
@@ -1293,7 +1293,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             triple: tcx.sess.opts.target_triple.clone(),
             hash: link_meta.crate_hash,
             disambiguator: tcx.sess.local_crate_disambiguator().to_string(),
-            panic_strategy: tcx.sess.opts.cg.panic.clone(),
+            panic_strategy: tcx.sess.panic_strategy(),
             plugin_registrar_fn: tcx.sess.plugin_registrar_fn.get().map(|id| {
                 tcx.map.local_def_id(id).index
             }),
diff --git a/src/librustc_metadata/schema.rs b/src/librustc_metadata/schema.rs
index f4d1e8e17f8..58e18bc709e 100644
--- a/src/librustc_metadata/schema.rs
+++ b/src/librustc_metadata/schema.rs
@@ -18,7 +18,7 @@ use rustc::middle::cstore::{LinkagePreference, NativeLibraryKind};
 use rustc::middle::lang_items;
 use rustc::mir;
 use rustc::ty::{self, Ty};
-use rustc::session::config::PanicStrategy;
+use rustc_back::PanicStrategy;
 
 use rustc_serialize as serialize;
 use syntax::{ast, attr};