Converted more stuff to bazel.

Change-Id: I18c4d5c38cc810086d00479962c1b3f16203a252
diff --git a/aos/common/libc/BUILD b/aos/common/libc/BUILD
new file mode 100644
index 0000000..fb27f3a
--- /dev/null
+++ b/aos/common/libc/BUILD
@@ -0,0 +1,58 @@
+package(default_visibility = ['//visibility:public'])
+
+cc_library(
+  name = 'aos_strsignal',
+  srcs = [
+    'aos_strsignal.cc',
+  ],
+  deps = [
+    '//aos/common/logging:logging_interface',
+  ],
+)
+
+cc_test(
+  name = 'aos_strsignal_test',
+  srcs = [
+    'aos_strsignal_test.cc',
+  ],
+  deps = [
+    ':aos_strsignal',
+    '//third_party/gtest',
+    '//aos/common/logging:logging',
+  ],
+)
+
+cc_library(
+  name = 'dirname',
+  srcs = [
+    'dirname.cc',
+  ],
+)
+
+cc_test(
+  name = 'dirname_test',
+  srcs = [
+    'dirname_test.cc',
+  ],
+  deps = [
+    '//third_party/gtest',
+  ],
+)
+
+cc_library(
+  name = 'aos_strerror',
+  srcs = [
+    'aos_strerror.cc',
+  ],
+)
+
+cc_test(
+  name = 'aos_strerror_test',
+  srcs = [
+    'aos_strerror_test.cc',
+  ],
+  deps = [
+    ':aos_strerror',
+    '//third_party/gtest',
+  ],
+)