Build sherpa-onnx as a single shared library (#1078)

When `-D BUILD_SHARED_LIBS=ON` is passed to `cmake`, it builds a single shared library.

Specifically, 

- For C APIs, it builds `libsherpa-onnx-c-api.so`
- For Python APIs, it builds `_sherpa_onnx.cpython-xx-xx.so`
- For Kotlin and Java APIs, it builds `libsherpa-onnx-jni.so`

There is no `libsherpa-onnx-core.so` any longer.

Note it affects only shared libraries.

sherpa-onnx/csrc/CMakeLists.txt

@@ -155,7 +155,18 @@ endif()
 if(SHERPA_ONNX_ENABLE_CHECK)
   list(APPEND sources log.cc)
 endif()
-add_library(sherpa-onnx-core ${sources})
+
+# Always static build
+add_library(sherpa-onnx-core STATIC ${sources})
+
+set_target_properties(
+    sherpa-onnx-core
+  PROPERTIES
+    POSITION_INDEPENDENT_CODE ON
+    C_VISIBILITY_PRESET hidden
+    CXX_VISIBILITY_PRESET hidden
+)
+
 if(APPLE)
   target_compile_options(sherpa-onnx-core PRIVATE
     -Wno-deprecated-declarations
@@ -213,6 +224,7 @@ if(SHERPA_ONNX_ENABLE_CHECK)
 endif()
 
 if(NOT BUILD_SHARED_LIBS AND CMAKE_SYSTEM_NAME STREQUAL Linux)
+  # This is for linux arm32 and arm64
   target_link_libraries(sherpa-onnx-core -ldl)
 endif()
 
@@ -264,16 +276,10 @@ if(SHERPA_ONNX_ENABLE_BINARY)
   endif()
 endif()
 
-if(SHERPA_ONNX_ENABLE_PYTHON AND WIN32)
-  install(TARGETS sherpa-onnx-core DESTINATION ..)
-else()
+if(NOT BUILD_SHARED_LIBS)
   install(TARGETS sherpa-onnx-core DESTINATION lib)
 endif()
 
-if(WIN32 AND BUILD_SHARED_LIBS)
-  install(TARGETS sherpa-onnx-core DESTINATION bin)
-endif()
-
 if(SHERPA_ONNX_ENABLE_BINARY)
   install(
     TARGETS
@@ -311,6 +317,9 @@ if(SHERPA_ONNX_HAS_ALSA AND SHERPA_ONNX_ENABLE_BINARY)
     )
   endif()
 
+  #   # To fix the following error for Windows when building exe
+  #   #  mismatch detected for 'RuntimeLibrary': value 'MT_StaticRelease' doesn't match value 'MD_Dynamic Release'
+
   foreach(exe IN LISTS exes)
     target_link_libraries(${exe} sherpa-onnx-core)
   endforeach()
@@ -386,12 +395,6 @@ if(SHERPA_ONNX_ENABLE_PORTAUDIO AND SHERPA_ONNX_ENABLE_BINARY)
     microphone.cc
   )
 
-  if(BUILD_SHARED_LIBS)
-    set(PA_LIB portaudio)
-  else()
-    set(PA_LIB portaudio_static)
-  endif()
-
   set(exes
     sherpa-onnx-microphone
     sherpa-onnx-keyword-spotter-microphone
@@ -408,7 +411,7 @@ if(SHERPA_ONNX_ENABLE_PORTAUDIO AND SHERPA_ONNX_ENABLE_BINARY)
   endif()
 
   foreach(exe IN LISTS exes)
-    target_link_libraries(${exe} ${PA_LIB} sherpa-onnx-core)
+    target_link_libraries(${exe} portaudio_static sherpa-onnx-core)
   endforeach()
 
   if(NOT WIN32)
@@ -473,7 +476,7 @@ if(SHERPA_ONNX_ENABLE_WEBSOCKET AND SHERPA_ONNX_ENABLE_BINARY)
     target_link_libraries(sherpa-onnx-offline-websocket-server "-Wl,-rpath,${SHERPA_ONNX_RPATH_ORIGIN}/../lib")
     target_link_libraries(sherpa-onnx-offline-websocket-server "-Wl,-rpath,${SHERPA_ONNX_RPATH_ORIGIN}/../../../sherpa_onnx/lib")
 
-    if(SHERPA_ONNX_ENABLE_PYTHON)
+    if(SHERPA_ONNX_ENABLE_PYTHON AND NOT WIN32)
       target_link_libraries(sherpa-onnx-online-websocket-server "-Wl,-rpath,${SHERPA_ONNX_RPATH_ORIGIN}/../lib/python${PYTHON_VERSION}/site-packages/sherpa_onnx/lib")
       target_link_libraries(sherpa-onnx-online-websocket-client "-Wl,-rpath,${SHERPA_ONNX_RPATH_ORIGIN}/../lib/python${PYTHON_VERSION}/site-packages/sherpa_onnx/lib")
       target_link_libraries(sherpa-onnx-offline-websocket-server "-Wl,-rpath,${SHERPA_ONNX_RPATH_ORIGIN}/../lib/python${PYTHON_VERSION}/site-packages/sherpa_onnx/lib")
@@ -550,4 +553,3 @@ add_custom_target(
   DEPENDS ${sources})
 
 add_custom_target(check DEPENDS clang-tidy-check)
-

sherpa-onnx/jni/CMakeLists.txt

@@ -35,5 +35,8 @@ endif()
 
 add_library(sherpa-onnx-jni ${sources})
 
+target_compile_definitions(sherpa-onnx-jni PRIVATE SHERPA_ONNX_BUILD_SHARED_LIBS=1)
+target_compile_definitions(sherpa-onnx-jni PRIVATE SHERPA_ONNX_BUILD_MAIN_LIB=1)
+
 target_link_libraries(sherpa-onnx-jni sherpa-onnx-core)
 install(TARGETS sherpa-onnx-jni DESTINATION lib)

sherpa-onnx/jni/common.h

@@ -12,11 +12,31 @@
 #include "android/asset_manager_jni.h"
 #endif
 
+#if defined(_WIN32)
+#if defined(SHERPA_ONNX_BUILD_SHARED_LIBS)
+#define SHERPA_ONNX_EXPORT __declspec(dllexport)
+#define SHERPA_ONNX_IMPORT __declspec(dllimport)
+#else
+#define SHERPA_ONNX_EXPORT
+#define SHERPA_ONNX_IMPORT
+#endif
+#else  // WIN32
+#define SHERPA_ONNX_EXPORT __attribute__((visibility("default")))
+
+#define SHERPA_ONNX_IMPORT SHERPA_ONNX_EXPORT
+#endif  // WIN32
+
+#if defined(SHERPA_ONNX_BUILD_MAIN_LIB)
+#define SHERPA_ONNX_API SHERPA_ONNX_EXPORT
+#else
+#define SHERPA_ONNX_API SHERPA_ONNX_IMPORT
+#endif
+
 // If you use ndk, you can find "jni.h" inside
 // android-ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include
 #include "jni.h"  // NOLINT
 
-#define SHERPA_ONNX_EXTERN_C extern "C"
+#define SHERPA_ONNX_EXTERN_C extern "C" SHERPA_ONNX_API
 
 // defined in jni.cc
 jobject NewInteger(JNIEnv *env, int32_t value);