Execute dsymutil on build on macOS (#4969)

* Execute dsymutil on build on macOS

* Use `Process.find_executable` instead of `which`

* Let `--no-debug` imply not running dsymutil

Author: asterite

src/compiler/crystal/command.cr

@@ -192,7 +192,10 @@ class Crystal::Command
     output_filename = Crystal.tempfile(config.output_filename)
 
     result = config.compile output_filename
-    execute output_filename, config.arguments unless config.compiler.no_codegen?
+
+    unless config.compiler.no_codegen?
+      execute output_filename, config.arguments, config.compiler
+    end
   end
 
   private def types
@@ -211,7 +214,7 @@ class Crystal::Command
     {config, result}
   end
 
-  private def execute(output_filename, run_args)
+  private def execute(output_filename, run_args, compiler)
     time? = @time && !@progress_tracker.stats?
     status, elapsed_time = @progress_tracker.stage("Execute") do
       begin
@@ -224,6 +227,13 @@ class Crystal::Command
         {$?, Time.now - start_time}
       ensure
         File.delete(output_filename) rescue nil
+
+        # Delete related dwarf generated by dsymutil, if any exists
+        {% if flag?(:darwin) %}
+          unless compiler.debug.none?
+            File.delete("#{output_filename}.dwarf") rescue nil
+          end
+        {% end %}
       end
     end
 

src/compiler/crystal/command/eval.cr

@@ -27,6 +27,6 @@ class Crystal::Command
     output_filename = Crystal.tempfile "eval"
 
     result = compiler.compile sources, output_filename
-    execute output_filename, program_args
+    execute output_filename, program_args, compiler
   end
 end

src/compiler/crystal/command/spec.cr

@@ -68,6 +68,6 @@ class Crystal::Command
     output_filename = Crystal.tempfile "spec"
 
     result = compiler.compile sources, output_filename
-    execute output_filename, options
+    execute output_filename, options, compiler
   end
 end

src/compiler/crystal/compiler.cr

@@ -254,13 +254,26 @@ module Crystal
         cross_compile program, units, output_filename
       else
         result = codegen program, units, output_filename, output_dir
+
+        {% if flag?(:darwin) %}
+          run_dsymutil(output_filename) unless debug.none?
+        {% end %}
       end
 
       CacheDir.instance.cleanup if @cleanup
 
       result
     end
 
+    private def run_dsymutil(filename)
+      dsymutil = Process.find_executable("dsymutil")
+      return unless dsymutil
+
+      @progress_tracker.stage("dsymutil") do
+        Process.run(dsymutil, ["--flat", filename])
+      end
+    end
+
     private def cross_compile(program, units, output_filename)
       llvm_mod = units.first.llvm_mod
       object_name = "#{output_filename}.o"