fix protobuf version conflict with os (remove unnecessary symbols)

mace/mace_version_script.lds

@@ -2,13 +2,15 @@ mace {
   global:
     *MaceTensor*;
     *MaceEngine*;
-    *MaceVersion*;
-    *SetOpenMPThreadPolicy*;
-    *SetGPUHints*;
-    *SetOpenCLBinaryPaths*;
+    *CreateMaceEngineFromProto*;
     *FileStorageFactory*;
     *SetKVStorageFactory*;
-    *CreateMaceEngineFromProto*;
+    *SetOpenCLBinaryPaths*;
+    *SetGPUHints*;
+    *SetOpenMPThreadPolicy*;
+    *SetOpenMPThreadAffinity*;
+    *GetBigLittleCoreIDs*;
+    *MaceVersion*;
   local:
     *;
 };

mace/public/mace.h

@@ -74,7 +74,7 @@ enum MaceStatus {
   }
 
 // MACE input/output tensor
-class MaceTensor {
+class __attribute__((visibility("default"))) MaceTensor {
  public:
   // shape - the shape of the tensor, with size n
   // data - the buffer of the tensor, must not be null with size equals
@@ -97,7 +97,7 @@ class MaceTensor {
   std::unique_ptr<Impl> impl_;
 };
 
-class MaceEngine {
+class __attribute__((visibility("default"))) MaceEngine {
  public:
   explicit MaceEngine(DeviceType device_type);
   ~MaceEngine();
@@ -127,6 +127,7 @@ class MaceEngine {
   MaceEngine &operator=(const MaceEngine &) = delete;
 };
 
+__attribute__((visibility("default")))
 MaceStatus CreateMaceEngineFromProto(
     const std::vector<unsigned char> &model_pb,
     const std::string &model_data_file,

mace/public/mace_runtime.h

@@ -63,7 +63,8 @@ class KVStorageFactory {
   virtual std::unique_ptr<KVStorage> CreateStorage(const std::string &name) = 0;
 };
 
-class FileStorageFactory : public KVStorageFactory {
+class __attribute__((visibility("default"))) FileStorageFactory
+    : public KVStorageFactory {
  public:
   explicit FileStorageFactory(const std::string &path);
 
@@ -77,6 +78,7 @@ class FileStorageFactory : public KVStorageFactory {
 };
 
 // Set KV store factory used as OpenCL cache. (Call Once)
+__attribute__((visibility("default")))
 void SetKVStorageFactory(std::shared_ptr<KVStorageFactory> storage_factory);
 
 // Just call once. (Not thread-safe)
@@ -85,11 +87,13 @@ void SetKVStorageFactory(std::shared_ptr<KVStorageFactory> storage_factory);
 // Using OpenCL binary will speed up the initialization.
 // OpenCL binary is corresponding to the OpenCL Driver version,
 // you should update the binary when OpenCL Driver changed.
+__attribute__((visibility("default")))
 void SetOpenCLBinaryPaths(const std::vector<std::string> &paths);
 
 // Set GPU hints, currently only supports Adreno GPU.
 //
 // Caution: this function may hurt performance if improper parameters provided.
+__attribute__((visibility("default")))
 void SetGPUHints(GPUPerfHint perf_hint, GPUPriorityHint priority_hint);
 
 // Set OpenMP threads number and affinity policy.
@@ -109,6 +113,7 @@ void SetGPUHints(GPUPerfHint perf_hint, GPUPriorityHint priority_hint);
 // If successful, it returns MACE_SUCCESS and error if it can't reliabley
 // detect big-LITTLE cores (see GetBigLittleCoreIDs). In such cases, it's
 // suggested to use AFFINITY_NONE to use all cores.
+__attribute__((visibility("default")))
 MaceStatus SetOpenMPThreadPolicy(int num_threads_hint,
                                  CPUAffinityPolicy policy);
 
@@ -119,6 +124,7 @@ MaceStatus SetOpenMPThreadPolicy(int num_threads_hint,
 // This function may not work well on some chips (e.g. MTK). Setting thread
 // affinity to offline cores may run very slow or unexpectedly. In such cases,
 // please use SetOpenMPThreadPolicy with default policy instead.
+__attribute__((visibility("default")))
 void SetOpenMPThreadAffinity(int num_threads, const std::vector<int> &cpu_ids);
 
 // Get ARM big.LITTLE configuration.
@@ -130,6 +136,7 @@ void SetOpenMPThreadAffinity(int num_threads, const std::vector<int> &cpu_ids);
 //
 // If successful, it returns MACE_SUCCESS and error if it can't reliabley
 // detect the frequency of big-LITTLE cores (e.g. MTK).
+__attribute__((visibility("default")))
 MaceStatus GetBigLittleCoreIDs(std::vector<int> *big_core_ids,
                                std::vector<int> *little_core_ids);
 

mace/tools/git/gen_version_source.sh

@@ -45,6 +45,7 @@ cat <<EOF > ${OUTPUT_FILENAME}
 // This is a generated file. DO NOT EDIT!
 
 namespace mace {
+__attribute__((visibility ("default")))
 const char *MaceVersion() { return "MACEVER-${GIT_VERSION}" + 8; }
 }  // namespace mace
 EOF

tools/bazel.rc

@@ -22,6 +22,7 @@ build:optimization --linkopt=-Wl,--strip-all
 build:optimization --copt=-ffunction-sections
 build:optimization --copt=-fdata-sections
 build:optimization --linkopt=-Wl,--gc-sections
+build:optimization --copt=-fvisibility=hidden
 
 # Address sanitizer
 build:asan --strip=never