Merge #788

788: gccrs: add the `-frust-crate=` option to set the crate name r=philberty a=mathstuf

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>

Fixes: #627 

Co-authored-by: Ben Boeckel <mathstuf@gmail.com>

Author: bors[bot]

gcc/rust/lang.opt

@@ -34,6 +34,10 @@ L
 Rust Joined Separate
 ; Not documented
 
+frust-crate=
+Rust Joined RejectNegative
+-frust-crate=<name>             Set the crate name for the compilation
+
 frust-debug
 Rust Var(flag_rust_debug)
 Dump various Rust front end internals.

gcc/rust/rust-session-manager.cc

@@ -70,8 +70,6 @@ const char *kHIRDumpFile = "gccrs.hir.dump";
 const char *kHIRTypeResolutionDumpFile = "gccrs.type-resolution.dump";
 const char *kTargetOptionsDumpFile = "gccrs.target-options.dump";
 
-// FIME in the imports/visibility milestone - this needs to be command line
-// option
 const std::string kDefaultCrateName = "TestCrate";
 
 // Implicitly enable a target_feature (and recursively enable dependencies).
@@ -330,6 +328,9 @@ Session::init ()
   // setup backend to GCC GIMPLE
   backend = rust_get_backend ();
 
+  // set the default crate name
+  options.set_crate_name (kDefaultCrateName);
+
   // the constant folder uses gcc
   ConstFold::Context::init (backend);
 }
@@ -359,6 +360,13 @@ Session::handle_option (
     case OPT_L:
       // TODO: add library link path or something
       break;
+    case OPT_frust_crate_:
+      // set the crate name
+      if (arg != nullptr)
+	ret = options.set_crate_name (arg);
+      else
+	ret = false;
+      break;
     case OPT_frust_dump_:
       // enable dump and return whether this was successful
       if (arg != nullptr)
@@ -451,7 +459,7 @@ void
 Session::parse_files (int num_files, const char **files)
 {
   auto mappings = Analysis::Mappings::get ();
-  CrateNum crate_num = mappings->setup_crate_mappings (kDefaultCrateName);
+  CrateNum crate_num = mappings->setup_crate_mappings (options.crate_name);
   mappings->set_current_crate (crate_num);
 
   for (int i = 0; i < num_files; i++)

gcc/rust/rust-session-manager.h

@@ -180,6 +180,7 @@ struct CompileOptions
    * whatever data related to target arch, features, os, family, env, endian,
    * pointer width, vendor */
   TargetOptions target_data;
+  std::string crate_name;
   bool enable_test = false;
   bool debug_assertions = false;
   bool proc_macro = false;
@@ -203,6 +204,13 @@ struct CompileOptions
     enable_dump_option (DumpOption::HIR_DUMP);
     enable_dump_option (DumpOption::TYPE_RESOLUTION_DUMP);
   }
+
+  bool set_crate_name (std::string name)
+  {
+    // TODO: validate the crate name?
+    crate_name = std::move (name);
+    return true;
+  }
 };
 
 /* Defines a compiler session. This is for a single compiler invocation, so