Add a target option for selecting a DWARF version

Certain platforms need to limit the DWARF version emitted (oxs, *bsd). This
change adds a dwarf_version entry to the options that allows a platform to
specify the dwarf version to use. By default this option is none and the default
DWARF version is selected.

Also adds an option for printing Option<u32> json keys

Author: amshafer

Diff for: compiler/rustc_codegen_llvm/src/debuginfo/mod.rs

@@ -120,10 +120,8 @@ pub fn finalize(cx: &CodegenCx<'_, '_>) {
         // for macOS to understand. For more info see #11352
         // This can be overridden using --llvm-opts -dwarf-version,N.
         // Android has the same issue (#22398)
-        if cx.sess().target.target.options.is_like_osx
-            || cx.sess().target.target.options.is_like_android
-        {
-            llvm::LLVMRustAddModuleFlag(cx.llmod, "Dwarf Version\0".as_ptr().cast(), 2)
+        if let Some(version) = cx.sess().target.target.options.dwarf_version {
+            llvm::LLVMRustAddModuleFlag(cx.llmod, "Dwarf Version\0".as_ptr().cast(), version)
         }
 
         // Indicate that we want CodeView debug information on MSVC

Diff for: compiler/rustc_target/src/spec/android_base.rs

@@ -9,6 +9,7 @@ pub fn opts() -> TargetOptions {
         .unwrap()
         .push("-Wl,--allow-multiple-definition".to_string());
     base.is_like_android = true;
+    base.dwarf_version = Some(2);
     base.position_independent_executables = true;
     base.has_elf_tls = false;
     base.requires_uwtable = true;

Diff for: compiler/rustc_target/src/spec/apple_base.rs

@@ -23,6 +23,7 @@ pub fn opts() -> TargetOptions {
         executables: true,
         target_family: Some("unix".to_string()),
         is_like_osx: true,
+        dwarf_version: Some(2),
         has_rpath: true,
         dll_prefix: "lib".to_string(),
         dll_suffix: ".dylib".to_string(),

Diff for: compiler/rustc_target/src/spec/dragonfly_base.rs

@@ -24,6 +24,7 @@ pub fn opts() -> TargetOptions {
         pre_link_args: args,
         position_independent_executables: true,
         relro_level: RelroLevel::Full,
+        dwarf_version: Some(2),
         ..Default::default()
     }
 }

Diff for: compiler/rustc_target/src/spec/freebsd_base.rs

@@ -26,6 +26,7 @@ pub fn opts() -> TargetOptions {
         eliminate_frame_pointer: false, // FIXME 43575
         relro_level: RelroLevel::Full,
         abi_return_struct_as_int: true,
+        dwarf_version: Some(2),
         ..Default::default()
     }
 }

Diff for: compiler/rustc_target/src/spec/mod.rs

@@ -816,6 +816,9 @@ pub struct TargetOptions {
     pub is_like_emscripten: bool,
     /// Whether the target toolchain is like Fuchsia's.
     pub is_like_fuchsia: bool,
+    /// Version of DWARF to use if not using the default.
+    /// Useful because some platforms (osx, bsd) only want up to DWARF2.
+    pub dwarf_version: Option<u32>,
     /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
     pub linker_is_gnu: bool,
     /// The MinGW toolchain has a known issue that prevents it from correctly
@@ -1012,6 +1015,7 @@ impl Default for TargetOptions {
             is_like_emscripten: false,
             is_like_msvc: false,
             is_like_fuchsia: false,
+            dwarf_version: None,
             linker_is_gnu: false,
             allows_weak_linkage: true,
             has_rpath: false,
@@ -1165,6 +1169,15 @@ impl Target {
                     base.options.$key_name = s;
                 }
             } );
+            ($key_name:ident, Option<u32>) => ( {
+                let name = (stringify!($key_name)).replace("_", "-");
+                if let Some(s) = obj.find(&name).and_then(Json::as_u64) {
+                    if s < 1 || s > 5 {
+                        return Err("Not a valid DWARF version number".to_string());
+                    }
+                    base.options.$key_name = Some(s as u32);
+                }
+            } );
             ($key_name:ident, Option<u64>) => ( {
                 let name = (stringify!($key_name)).replace("_", "-");
                 if let Some(s) = obj.find(&name).and_then(Json::as_u64) {
@@ -1417,6 +1430,7 @@ impl Target {
         key!(is_like_emscripten, bool);
         key!(is_like_android, bool);
         key!(is_like_fuchsia, bool);
+        key!(dwarf_version, Option<u32>);
         key!(linker_is_gnu, bool);
         key!(allows_weak_linkage, bool);
         key!(has_rpath, bool);
@@ -1654,6 +1668,7 @@ impl ToJson for Target {
         target_option_val!(is_like_emscripten);
         target_option_val!(is_like_android);
         target_option_val!(is_like_fuchsia);
+        target_option_val!(dwarf_version);
         target_option_val!(linker_is_gnu);
         target_option_val!(allows_weak_linkage);
         target_option_val!(has_rpath);

Diff for: compiler/rustc_target/src/spec/netbsd_base.rs

@@ -24,6 +24,7 @@ pub fn opts() -> TargetOptions {
         position_independent_executables: true,
         relro_level: RelroLevel::Full,
         use_ctors_section: true,
+        dwarf_version: Some(2),
         ..Default::default()
     }
 }

Diff for: compiler/rustc_target/src/spec/openbsd_base.rs

@@ -26,6 +26,7 @@ pub fn opts() -> TargetOptions {
         position_independent_executables: true,
         eliminate_frame_pointer: false, // FIXME 43575
         relro_level: RelroLevel::Full,
+        dwarf_version: Some(2),
         ..Default::default()
     }
 }