Do not emit .eh_frame section when using -Cpanic=abort

build_sysroot/build_sysroot.sh

@@ -27,4 +27,10 @@ fi
 
 # Copy files to sysroot
 mkdir -p sysroot/lib/rustlib/$TARGET_TRIPLE/lib/
+# TODO: copy src if asked by the user.
+# Or is it not necessary because using KRUSTFLAGS sets the sysroot in too many cases?
+# How I did it:
+# cd build_sysroot/sysroot/lib/rustlib
+# mkdir -p src/rust
+# cp -r ../../../sysroot_src/library/ src/rust/
 cp -r target/$TARGET_TRIPLE/$sysroot_channel/deps/* sysroot/lib/rustlib/$TARGET_TRIPLE/lib/

src/base.rs

@@ -3,7 +3,6 @@ use std::env;
 use std::time::Instant;
 
 use gccjit::{
-    Context,
     FunctionType,
     GlobalKind,
 };
@@ -18,8 +17,9 @@ use rustc_codegen_ssa::mono_item::MonoItemExt;
 use rustc_codegen_ssa::traits::DebugInfoMethods;
 use rustc_session::config::DebugInfo;
 use rustc_span::Symbol;
+use rustc_target::spec::PanicStrategy;
 
-use crate::{LockedTargetInfo, gcc_util};
+use crate::{LockedTargetInfo, gcc_util, new_context};
 use crate::GccContext;
 use crate::builder::Builder;
 use crate::context::CodegenCx;
@@ -88,20 +88,18 @@ pub fn compile_codegen_unit(tcx: TyCtxt<'_>, cgu_name: Symbol, target_info: Lock
     fn module_codegen(tcx: TyCtxt<'_>, (cgu_name, target_info): (Symbol, LockedTargetInfo)) -> ModuleCodegen<GccContext> {
         let cgu = tcx.codegen_unit(cgu_name);
         // Instantiate monomorphizations without filling out definitions yet...
-        let context = Context::default();
+        let context = new_context(&tcx);
 
-        context.add_command_line_option("-fexceptions");
-        context.add_driver_option("-fexceptions");
+        if tcx.sess.panic_strategy() == PanicStrategy::Unwind {
+            context.add_command_line_option("-fexceptions");
+            context.add_driver_option("-fexceptions");
+        }
 
         let disabled_features: HashSet<_> = tcx.sess.opts.cg.target_feature.split(',')
             .filter(|feature| feature.starts_with('-'))
             .map(|string| &string[1..])
             .collect();
 
-        if tcx.sess.target.arch == "x86" || tcx.sess.target.arch == "x86_64" {
-            context.add_command_line_option("-masm=intel");
-        }
-
         if !disabled_features.contains("avx") && tcx.sess.target.arch == "x86_64" {
             // NOTE: we always enable AVX because the equivalent of llvm.x86.sse2.cmp.pd in GCC for
             // SSE2 is multiple builtins, so we use the AVX __builtin_ia32_cmppd instead.

src/lib.rs

@@ -233,17 +233,23 @@ impl CodegenBackend for GccCodegenBackend {
     }
 }
 
+fn new_context<'gcc, 'tcx>(tcx: &TyCtxt<'tcx>) -> Context<'gcc> {
+    let context = Context::default();
+    if tcx.sess.target.arch == "x86" || tcx.sess.target.arch == "x86_64" {
+        context.add_command_line_option("-masm=intel");
+    }
+    context.add_command_line_option("-fno-asynchronous-unwind-tables");
+    context
+}
+
 impl ExtraBackendMethods for GccCodegenBackend {
     fn codegen_allocator<'tcx>(&self, tcx: TyCtxt<'tcx>, module_name: &str, kind: AllocatorKind, alloc_error_handler_kind: AllocatorKind) -> Self::Module {
         let mut mods = GccContext {
-            context: Context::default(),
+            context: new_context(&tcx),
             should_combine_object_files: false,
             temp_dir: None,
         };
 
-        if tcx.sess.target.arch == "x86" || tcx.sess.target.arch == "x86_64" {
-            mods.context.add_command_line_option("-masm=intel");
-        }
         unsafe { allocator::codegen(tcx, &mut mods, module_name, kind, alloc_error_handler_kind); }
         mods
     }