Fix TFLite builds on Windows/MacOS

Avoid using `--enable_platform_specific_config` when cross-compiling for
iOS/Android, as this pulls in host build flags, which may not be
appropriate (e.g., when cross-compiling for Android on a Windows host).

Also fix an issue when building tensorflowlite_c for iOS.

Fixes #38525.

PiperOrigin-RevId: 311767770
Change-Id: I80b817fd89a6889dc78be50f1def8b899f091cb6

.bazelrc

@@ -235,10 +235,15 @@ build:c++17 --cxxopt=-std=c++1z
 build:c++17 --cxxopt=-stdlib=libc++
 build:c++1z --config=c++17
 
-# Enable using platform specific build settings
+# Enable using platform specific build settings, except when cross-compiling for
+# mobile platforms.
 build --enable_platform_specific_config
+build:android --noenable_platform_specific_config
+build:ios --noenable_platform_specific_config
 
 # Suppress C++ compiler warnings, otherwise build logs become 10s of MBs.
+build:android --copt=-w
+build:ios --copt=-w
 build:linux --copt=-w
 build:macos --copt=-w
 build:windows --copt=/w
@@ -258,6 +263,10 @@ build:macos --define=INCLUDEDIR=$(PREFIX)/include
 # TF_SYSTEM_LIBS do not work on windows.
 
 # By default, build TF in C++ 14 mode.
+build:android --cxxopt=-std=c++14
+build:android --host_cxxopt=-std=c++14
+build:ios --cxxopt=-std=c++14
+build:ios --host_cxxopt=-std=c++14
 build:linux --cxxopt=-std=c++14
 build:linux --host_cxxopt=-std=c++14
 build:macos --cxxopt=-std=c++14

configure.py

@@ -1387,7 +1387,6 @@ def main():
     # Windows.
     environ_cp['TF_DOWNLOAD_CLANG'] = '0'
     environ_cp['TF_NEED_MPI'] = '0'
-    environ_cp['TF_SET_ANDROID_WORKSPACE'] = '0'
 
   if is_macos():
     environ_cp['TF_NEED_TENSORRT'] = '0'

tensorflow/lite/c/BUILD

@@ -22,6 +22,9 @@ package(
 tflite_cc_shared_object(
     name = "tensorflowlite_c",
     linkopts = select({
+        "//tensorflow:ios": [
+            "-Wl,-exported_symbols_list,$(location //tensorflow/lite/c:exported_symbols.lds)",
+        ],
         "//tensorflow:macos": [
             "-Wl,-exported_symbols_list,$(location //tensorflow/lite/c:exported_symbols.lds)",
         ],

tensorflow/tensorflow.bzl

@@ -615,6 +615,9 @@ def tf_cc_shared_object(
             linkshared = 1,
             data = data + data_extra,
             linkopts = linkopts + _rpath_linkopts(name_os_full) + select({
+                clean_dep("//tensorflow:ios"): [
+                    "-Wl,-install_name,@rpath/" + soname,
+                ],
                 clean_dep("//tensorflow:macos"): [
                     "-Wl,-install_name,@rpath/" + soname,
                 ],