stage2: get rid of failed_root_src_file

BRANCH_TODO

@@ -1,17 +1,8 @@
- * modify stage2 CBE tests so that only 1 uses pub export main and the
-   rest use pub fn main
-
- * get the test runner and `zig test` working
- * get behavior tests passing for stage2
-
  * use a hash map for instructions because the array is too big
    - no, actually modify the Zir.Inst.Ref strategy so that each decl gets
      their indexes starting at 0 so that we can use an array to store Sema
      results rather than a map.
 
- * implement the new AstGen compile errors
-
- * get rid of failed_root_src_file
  * get rid of Scope.DeclRef
  * get rid of NameHash
  * handle decl collision with usingnamespace
@@ -68,3 +59,13 @@
  * repl: if you try `run` with -ofmt=c you get an access denied error because it
    tries to execute the .c file as a child process instead of executing `zig run`
    on it.
+
+=== file issues: ===
+
+ * C backend: honor the exported symbol name. Right now if you do `pub fn main`
+   it generates bogus C code because the `@export` name is not honored, and it allows
+   the `main` which should be not exported, to clobber the exported symbol name.
+
+ * get the test runner and `zig test` working
+   - get behavior tests passing for stage2
+

src/Compilation.zig

@@ -1681,8 +1681,7 @@ pub fn totalErrorCount(self: *Compilation) usize {
     var total: usize = self.failed_c_objects.count() + self.misc_failures.count();
 
     if (self.bin_file.options.module) |module| {
-        total += module.failed_exports.items().len +
-            @boolToInt(module.failed_root_src_file != null);
+        total += module.failed_exports.items().len;
 
         for (module.failed_files.items()) |entry| {
             if (entry.value) |_| {
@@ -1789,15 +1788,6 @@ pub fn getAllErrorsAlloc(self: *Compilation) !AllErrors {
         for (module.failed_exports.items()) |entry| {
             try AllErrors.add(module, &arena, &errors, entry.value.*);
         }
-        if (module.failed_root_src_file) |err| {
-            const file_path = try module.root_pkg.root_src_directory.join(&arena.allocator, &[_][]const u8{
-                module.root_pkg.root_src_path,
-            });
-            const msg = try std.fmt.allocPrint(&arena.allocator, "unable to read {s}: {s}", .{
-                file_path, @errorName(err),
-            });
-            try AllErrors.addPlain(&arena, &errors, msg);
-        }
     }
 
     if (errors.items.len == 0 and self.link_error_flags.no_entry_point_found) {

src/Module.zig

@@ -92,9 +92,6 @@ error_name_list: ArrayListUnmanaged([]const u8) = .{},
 /// previous analysis.
 generation: u32 = 0,
 
-/// When populated it means there was an error opening/reading the root source file.
-failed_root_src_file: ?anyerror = null,
-
 stage1_flags: packed struct {
     have_winmain: bool = false,
     have_wwinmain: bool = false,