Disable `.debug_aranges` for all wasm targets

This follows from discussion on
https://bugs.llvm.org/show_bug.cgi?id=52442 where it looks like this
section doesn't make sense for wasm targets.

2 files changed, 12 insertions, 0 deletions

diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 69b90bf10fe..0771f998535 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1357,6 +1357,9 @@ pub struct TargetOptions {
 
     /// Minimum number of bits in #[repr(C)] enum. Defaults to 32.
     pub c_enum_min_bits: u64,
+
+    /// Whether or not the DWARF `.debug_aranges` section should be generated.
+    pub generate_arange_section: bool,
 }
 
 impl Default for TargetOptions {
@@ -1462,6 +1465,7 @@ impl Default for TargetOptions {
             supported_sanitizers: SanitizerSet::empty(),
             default_adjusted_cabi: None,
             c_enum_min_bits: 32,
+            generate_arange_section: true,
         }
     }
 }
@@ -2047,6 +2051,7 @@ impl Target {
         key!(supported_sanitizers, SanitizerSet)?;
         key!(default_adjusted_cabi, Option<Abi>)?;
         key!(c_enum_min_bits, u64);
+        key!(generate_arange_section, bool);
 
         if base.is_builtin {
             // This can cause unfortunate ICEs later down the line.
@@ -2286,6 +2291,7 @@ impl ToJson for Target {
         target_option_val!(split_debuginfo);
         target_option_val!(supported_sanitizers);
         target_option_val!(c_enum_min_bits);
+        target_option_val!(generate_arange_section);
 
         if let Some(abi) = self.default_adjusted_cabi {
             d.insert("default-adjusted-cabi".to_string(), Abi::name(abi).to_json());
diff --git a/compiler/rustc_target/src/spec/wasm_base.rs b/compiler/rustc_target/src/spec/wasm_base.rs
index 4c954a1e567..24e9c625169 100644
--- a/compiler/rustc_target/src/spec/wasm_base.rs
+++ b/compiler/rustc_target/src/spec/wasm_base.rs
@@ -128,6 +128,12 @@ pub fn options() -> TargetOptions {
         // gdb scripts don't work on wasm blobs
         emit_debug_gdb_scripts: false,
 
+        // There's more discussion of this at
+        // https://bugs.llvm.org/show_bug.cgi?id=52442 but the general result is
+        // that this isn't useful for wasm and has tricky issues with
+        // representation, so this is disabled.
+        generate_arange_section: false,
+
         ..Default::default()
     }
 }