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debuginfo: Revert to old/more verbose behavior for -Cdebuginfo=1 #61007

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May 22, 2019
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debuginfo: Revert to old/more verbose behavior for -Cdebuginfo=1 #61007

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23 changes: 21 additions & 2 deletions src/librustc_codegen_llvm/debuginfo/metadata.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ use rustc::ty::{self, AdtKind, ParamEnv, Ty, TyCtxt};
use rustc::ty::layout::{self, Align, Integer, IntegerExt, LayoutOf,
PrimitiveExt, Size, TyLayout, VariantIdx};
use rustc::ty::subst::UnpackedKind;
use rustc::session::config;
use rustc::session::config::{self, DebugInfo};
use rustc::util::nodemap::FxHashMap;
use rustc_fs_util::path_to_c_string;
use rustc_data_structures::small_c_str::SmallCStr;
Expand Down Expand Up @@ -925,7 +925,26 @@ pub fn compile_unit_metadata(tcx: TyCtxt<'_, '_, '_>,
let producer = CString::new(producer).unwrap();
let flags = "\0";
let split_name = "\0";
let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo);

// FIXME(#60020):
//
// This should actually be
//
// ```
// let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo);
// ```
//
// that is, we should set LLVM's emission kind to `LineTablesOnly` if
// we are compiling with "limited" debuginfo. However, some of the
// existing tools relied on slightly more debuginfo being generated than
// would be the case with `LineTablesOnly`, and we did not want to break
// these tools in a "drive-by fix", without a good idea or plan about
// what limited debuginfo should exactly look like. So for now we keep
// the emission kind as `FullDebug`.
//
// See https://github.com/rust-lang/rust/issues/60020 for details.
let kind = DebugEmissionKind::FullDebug;
assert!(tcx.sess.opts.debuginfo != DebugInfo::None);

unsafe {
let file_metadata = llvm::LLVMRustDIBuilderCreateFile(
Expand Down