Port StringPrintf from //base (#624)

* Port StringPrintf from //base.

  Prefer this to approaches based on variadic templates. While the variadic
  template mechanisms are strictly safer, they result in binary bloat we
  can't afford.

  This is essentially the same StringPrintf previously open sourced as a
  part of protobuf, though updated for C++11 which saves a copy and a
  temporary buffer on the heap.

* Add abseil as a subdirectory of Firestore

  This saves having to redefine all the libraries that abseil defines as
  imported libraries.

* Rename firebase_firesture_util_log_* targets

  Cut the log out of the name to reflect that these will get more
  components besides just logging.

1 files changed, 31 insertions, 10 deletions

diff --git a/Firestore/core/src/firebase/firestore/util/CMakeLists.txt b/Firestore/core/src/firebase/firestore/util/CMakeLists.txt
index d70397d..a2da3b4 100644
--- a/Firestore/core/src/firebase/firestore/util/CMakeLists.txt
+++ b/Firestore/core/src/firebase/firestore/util/CMakeLists.txt
@@ -12,50 +12,71 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# firebase_firestore_util is the interface of this module. The rest of the
+# libraries in here are an implementation detail of making this a
+# mutli-platform build.
+
 add_library(
-  firebase_firestore_util
-  autoid.cc
+  firebase_firestore_util_base
   secure_random_arc4random.cc
+  string_printf.cc
+)
+target_link_libraries(
+  firebase_firestore_util_base
+  PRIVATE
+  absl_base
 )
 
-# log_stdio can be built and tested everywhere
+# stdio-dependent bits can be built and tested everywhere
 add_library(
-  firebase_firestore_util_log_stdio
+  firebase_firestore_util_stdio
   log_stdio.cc
 )
+target_link_libraries(
+  firebase_firestore_util_stdio
+  PUBLIC
+  firebase_firestore_util_base
+)
 
-# log_apple can only built and tested on apple plaforms
+# apple-dependent bits can only built and tested on apple plaforms
 if(APPLE)
   add_library(
-    firebase_firestore_util_log_apple
+    firebase_firestore_util_apple
     log_apple.mm
   )
   target_compile_options(
-    firebase_firestore_util_log_apple
+    firebase_firestore_util_apple
     PRIVATE
     ${OBJC_FLAGS}
   )
   target_link_libraries(
-    firebase_firestore_util_log_apple
+    firebase_firestore_util_apple
     PUBLIC
     FirebaseCore
   )
 endif(APPLE)
 
+add_library(
+  firebase_firestore_util
+  autoid.cc
+)
+
 # Export a dependency on the correct logging library for this platform. All
 # buildable libraries are built and tested but only the best fit is exported.
 if(APPLE)
   target_link_libraries(
     firebase_firestore_util
     PUBLIC
-    firebase_firestore_util_log_apple
+    firebase_firestore_util_apple
+    firebase_firestore_util_base
   )
 
 else(NOT APPLE)
   target_link_libraries(
     firebase_firestore_util
     PUBLIC
-    firebase_firestore_util_log_stdio
+    firebase_firestore_util_stdio
+    firebase_firestore_util_base
   )
 
 endif(APPLE)