Use use_default_shell_env whenever possible

go/private/actions/asm.bzl

@@ -47,5 +47,10 @@ def emit_asm(
         executable = go.toolchain._builder,
         arguments = [builder_args, "--", tool_args],
         env = go.env,
+        # We may need the shell environment (potentially augmented with --action_env)
+        # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+        # .dll files in non-default locations that must be in PATH. The target configuration
+        # may not have a C compiler, so we have no idea what PATH should be.
+        use_default_shell_env = "PATH" not in go.env,
     )
     return out_obj

go/private/actions/compile.bzl

@@ -87,4 +87,9 @@ def emit_compile(
         executable = go.toolchain._builder,
         arguments = [builder_args, "--", tool_args],
         env = go.env,
+        # We may need the shell environment (potentially augmented with --action_env)
+        # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+        # .dll files in non-default locations that must be in PATH. The target configuration
+        # may not have a C compiler, so we have no idea what PATH should be.
+        use_default_shell_env = "PATH" not in go.env,
     )

go/private/actions/compilepkg.bzl

@@ -132,6 +132,11 @@ def emit_compilepkg(
         executable = go.toolchain._builder,
         arguments = [args],
         env = go.env,
+        # We may need the shell environment (potentially augmented with --action_env)
+        # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+        # .dll files in non-default locations that must be in PATH. The target configuration
+        # may not have a C compiler, so we have no idea what PATH should be.
+        use_default_shell_env = "PATH" not in go.env,
     )
 
 def _quote_opts(opts):

go/private/actions/cover.bzl

@@ -67,6 +67,11 @@ def emit_cover(go, source):
             executable = go.toolchain._builder,
             arguments = [args],
             env = go.env,
+            # We may need the shell environment (potentially augmented with --action_env)
+            # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+            # .dll files in non-default locations that must be in PATH. The target configuration
+            # may not have a C compiler, so we have no idea what PATH should be.
+            use_default_shell_env = "PATH" not in go.env,
         )
     members = structs.to_dict(source)
     members["srcs"] = covered

go/private/actions/link.bzl

@@ -181,6 +181,11 @@ def emit_link(
         executable = go.toolchain._builder,
         arguments = [builder_args, "--", tool_args],
         env = go.env,
+        # We may need the shell environment (potentially augmented with --action_env)
+        # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+        # .dll files in non-default locations that must be in PATH. The target configuration
+        # may not have a C compiler, so we have no idea what PATH should be.
+        use_default_shell_env = "PATH" not in go.env,
     )
 
 def _extract_extldflags(gc_linkopts, extldflags):

go/private/actions/pack.bzl

@@ -40,4 +40,9 @@ def emit_pack(
         executable = go.toolchain._builder,
         arguments = [args],
         env = go.env,
+        # We may need the shell environment (potentially augmented with --action_env)
+        # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+        # .dll files in non-default locations that must be in PATH. The target configuration
+        # may not have a C compiler, so we have no idea what PATH should be.
+        use_default_shell_env = "PATH" not in env,
     )

go/private/actions/stdlib.bzl

@@ -97,6 +97,11 @@ def _build_stdlib(go):
         executable = go.toolchain._builder,
         arguments = [args],
         env = env,
+        # We may need the shell environment (potentially augmented with --action_env)
+        # to invoke protoc on Windows. If protoc was built with mingw, it probably needs
+        # .dll files in non-default locations that must be in PATH. The target configuration
+        # may not have a C compiler, so we have no idea what PATH should be.
+        use_default_shell_env = "PATH" not in env,
     )
     return GoStdLib(
         root_file = root_file,

go/private/rules/info.bzl

@@ -28,6 +28,7 @@ def _go_info_impl(ctx):
         mnemonic = "GoInfo",
         executable = ctx.executable._go_info,
         arguments = [args],
+        use_default_shell_env = True,
     )
     return [DefaultInfo(
         files = depset([report]),