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Disable .debug_aranges for all wasm targets

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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.
This commit is contained in:
Alex Crichton 2021-11-10 10:47:00 -08:00
parent 9a442353f3
commit 7dc38369c0
3 changed files with 14 additions and 8 deletions
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10
compiler/rustc_codegen_llvm/src/llvm_util.rs
View file

@ -75,14 +75,8 @@ unsafe fn configure_llvm(sess: &Session) {
if sess.print_llvm_passes() {
add("-debug-pass=Structure", false);
}
if !sess.opts.debugging_opts.no_generate_arange_section
// FIXME: An LLVM bug [1] means that if this option is enabled for
// wasm64 then LLVM will crash when generating debuginfo. Assuming
// that this gets fixed in LLVM 14 this condition here is a
// workaround to work with versions of LLVM 13 and prior.
//
// [1]: https://bugs.llvm.org/show_bug.cgi?id=52376
&& (sess.target.arch != "wasm64" || llvm_util::get_version() >= (14, 0, 0))
if sess.target.generate_arange_section
&& !sess.opts.debugging_opts.no_generate_arange_section
{
add("-generate-arange-section", false);
}

6
compiler/rustc_target/src/spec/mod.rs
View file

@ -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());

6
compiler/rustc_target/src/spec/wasm_base.rs
View file

@ -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()
}
}