pw_assert: Add pw_assert_basic CMake build

Change-Id: I5dfda5ccf3077ff799bdf7761250ba9eb00366dd
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f16ca06..c9e6b7d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@
 include(pw_build/pigweed.cmake)
 
 add_subdirectory(pw_assert)
+add_subdirectory(pw_assert_basic)
 add_subdirectory(pw_base64)
 add_subdirectory(pw_checksum)
 add_subdirectory(pw_containers)
diff --git a/pw_assert/public/pw_assert/assert.h b/pw_assert/public/pw_assert/assert.h
index f878bd0..2ad8c07 100644
--- a/pw_assert/public/pw_assert/assert.h
+++ b/pw_assert/public/pw_assert/assert.h
@@ -202,7 +202,7 @@
                                           argument_b_str,        \
                                           argument_b_val,        \
                                           type_fmt,              \
-                                          "");
+                                          "")
 
 // PW_CHECK_BINARY_COMPARISON version 2: With message (and maybe args)
 //
diff --git a/pw_assert_basic/CMakeLists.txt b/pw_assert_basic/CMakeLists.txt
new file mode 100644
index 0000000..432e5f9
--- /dev/null
+++ b/pw_assert_basic/CMakeLists.txt
@@ -0,0 +1,28 @@
+# Copyright 2020 The Pigweed Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+pw_auto_add_simple_module(pw_assert_basic
+  IMPLEMENTS_FACADE
+    pw_assert
+  PRIVATE_DEPS
+    pw_dumb_io
+    pw_preprocessor
+    pw_string
+)
+
+target_include_directories(pw_assert_basic PUBLIC public_overrides)
+
+# TODO(hepler): Declare pw_assert_basic as the pw_assert backend for now.
+add_library(pw_assert.backend INTERFACE)
+target_link_libraries(pw_assert.backend INTERFACE pw_assert_basic)