allow to set line-directives-only too

config.example.toml

@@ -517,11 +517,8 @@
 #overflow-checks-std = rust.overflow-checks (boolean)
 
 # Debuginfo level for most of Rust code, corresponds to the `-C debuginfo=N` option of `rustc`.
-# `0` - no debug info
-# `1` - line tables only - sufficient to generate backtraces that include line
-#       information and inlined functions, set breakpoints at source code
-#       locations, and step through execution in a debugger.
-# `2` - full debug info with variable and type information
+# See https://doc.rust-lang.org/rustc/codegen-options/index.html#debuginfo for available options.
+#
 # Can be overridden for specific subsets of Rust code (rustc, std or tools).
 # Debuginfo for tests run with compiletest is not controlled by this option
 # and needs to be enabled separately with `debuginfo-level-tests`.

src/bootstrap/src/core/config/config.rs

@@ -55,6 +55,7 @@ pub enum DryRun {
 pub enum DebuginfoLevel {
     #[default]
     None,
+    LineDirectivesOnly,
     LineTablesOnly,
     Limited,
     Full,
@@ -72,6 +73,9 @@ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
         Ok(match Deserialize::deserialize(deserializer)? {
             StringOrInt::String(s) if s == "none" => DebuginfoLevel::None,
             StringOrInt::Int(0) => DebuginfoLevel::None,
+            StringOrInt::String(s) if s == "line-directives-only" => {
+                DebuginfoLevel::LineDirectivesOnly
+            }
             StringOrInt::String(s) if s == "line-tables-only" => DebuginfoLevel::LineTablesOnly,
             StringOrInt::String(s) if s == "limited" => DebuginfoLevel::Limited,
             StringOrInt::Int(1) => DebuginfoLevel::Limited,
@@ -98,6 +102,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use DebuginfoLevel::*;
         f.write_str(match self {
             None => "0",
+            LineDirectivesOnly => "line-directives-only",
             LineTablesOnly => "line-tables-only",
             Limited => "1",
             Full => "2",