Delete Firestore public C++ API

cmake/Findfirebase_cpp_sdk.cmake

@@ -34,6 +34,10 @@ if(APPLE)
   else()
     set(FIREBASE_CPP_LIB_DIR ${FIREBASE_CPP_SDK_DIR}/libs/darwin/universal)
   endif()
+
+elseif(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+  set(FIREBASE_CPP_LIB_DIR ${FIREBASE_CPP_SDK_DIR}/libs/linux/${CMAKE_SYSTEM_PROCESSOR})
+
 endif()
 
 find_library(

cmake/compiler_id.cmake

@@ -12,12 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Adds cheap tests for various compilers
+# Adds cheap tests for various compilers, and any global compiler setup
+# required across all dependencies.
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(CXX_CLANG TRUE)
 endif()
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   set(CXX_GNU TRUE)
+
+  if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    # Disable the C++11 ABI introduced in GCC 5 for compatibility with Firebase
+    # C++, which is still compiled with GCC 4.
+    #
+    # Note that this is set here rather than in compiler_setup.cmake so that it
+    # applies to all subdirectory builds, including all external dependencies.
+    #
+    # TODO(b/119137881): Remove this when Firebase C++ built with GCC 5.
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_GLIBCXX_USE_CXX11_ABI=0")
+  endif()
 endif()

cmake/compiler_setup.cmake

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# C++ Compiler setup
+# C++ Compiler setup that's local to Firebase code in this repo.
 
 include(compiler_id)