[LITE][BUILD] Fix armv8-cpu clang compile (#3102)

* [LITE][CMAKE] support clang compile for armv8 cpu. test=develop

* add build for clang. test=develop

* fix cmake format. test=develop

cmake/cross_compiling/postproject.cmake

@@ -60,11 +60,16 @@ endfunction()
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 if (LITE_ON_TINY_PUBLISH)
     if(NOT LITE_WITH_PYTHON)
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
+	    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
+    endif()
+    if(ARM_TARGET_LANG STREQUAL "clang")
+        # TODO(ysh329): add options for clang like gcc branch below
+    else() # ARM_TARGET_LANG STREQUAL "gcc"
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffast-math -Ofast -Os -fomit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden -ffunction-sections")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility-inlines-hidden -ffunction-sections")
+        check_linker_flag(-Wl,--gc-sections)
     endif()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffast-math -Ofast -Os -fomit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden -ffunction-sections")
-    check_linker_flag(-Wl,--gc-sections)
 endif()
 
 if(LITE_WITH_OPENMP)

lite/api/CMakeLists.txt

@@ -5,8 +5,13 @@ else()
 endif(LITE_WITH_LIGHT_WEIGHT_FRAMEWORK)
 
 if (LITE_ON_TINY_PUBLISH)
-    set(CMAKE_CXX_FLAGS_RELEASE "-Os -DNDEBUG")
-    set(CMAKE_C_FLAGS_RELEASE "-Os -DNDEBUG")
+    if(ARM_TARGET_LANG STREQUAL "clang")
+        set(CMAKE_CXX_FLAGS_RELEASE " -DNDEBUG")
+        set(CMAKE_C_FLAGS_RELEASE " -DNDEBUG")
+    else() # gcc
+        set(CMAKE_CXX_FLAGS_RELEASE "-Os -DNDEBUG")
+        set(CMAKE_C_FLAGS_RELEASE "-Os -DNDEBUG")
+    endif()
 endif()
 set(light_lib_DEPS light_api paddle_api paddle_api_light optimizer)
 if ((NOT LITE_ON_TINY_PUBLISH) AND (LITE_WITH_CUDA OR LITE_WITH_X86 OR ARM_TARGET_OS STREQUAL "android" OR ARM_TARGET_OS STREQUAL "armlinux"))
@@ -45,7 +50,11 @@ else()
     if ((ARM_TARGET_OS STREQUAL "android") OR (ARM_TARGET_OS STREQUAL "armlinux"))
         add_library(paddle_light_api_shared SHARED "")
         target_sources(paddle_light_api_shared PUBLIC ${__lite_cc_files} paddle_api.cc light_api.cc light_api_impl.cc)
-        set_target_properties(paddle_light_api_shared PROPERTIES COMPILE_FLAGS "-flto -fdata-sections")
+        if(ARM_TARGET_LANG STREQUAL "clang")
+            set_target_properties(paddle_light_api_shared PROPERTIES COMPILE_FLAGS "")
+        else() # ARM_TARGET_LANG STREQUAL "gcc"
+            set_target_properties(paddle_light_api_shared PROPERTIES COMPILE_FLAGS "-flto -fdata-sections")
+        endif()
         add_dependencies(paddle_light_api_shared op_list_h kernel_list_h)
         if (LITE_WITH_NPU)
             # Need to add HIAI runtime libs (libhiai.so) dependency

lite/api/android/jni/native/CMakeLists.txt

 # Generate paddle_lite_jni.so
 
 if (LITE_ON_TINY_PUBLISH)
-    set(CMAKE_CXX_FLAGS_RELEASE "-Os -DNDEBUG")
-    set(CMAKE_C_FLAGS_RELEASE "-Os -DNDEBUG")
+    if(ARM_TARGET_LANG STREQUAL "clang")
+        set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG")
+        set(CMAKE_C_FLAGS_RELEASE "-DNDEBUG")
+    else() # ARM_TARGET_LANG STREQUAL "gcc"
+        set(CMAKE_CXX_FLAGS_RELEASE "-Os -DNDEBUG")
+        set(CMAKE_C_FLAGS_RELEASE "-Os -DNDEBUG")
+    endif()
     set(lib_DEPS light_api paddle_api paddle_api_light)
 else()
     set(lib_DEPS light_api cxx_api paddle_api_full paddle_api paddle_api_light)
@@ -25,7 +30,11 @@ if (NOT LITE_ON_TINY_PUBLISH)
     endif()
 else()
     add_library(paddle_lite_jni SHARED "")
-    set_target_properties(paddle_lite_jni PROPERTIES COMPILE_FLAGS "-flto -fdata-sections")
+    if(ARM_TARGET_LANG STREQUAL "clang")
+        set_target_properties(paddle_lite_jni PROPERTIES COMPILE_FLAGS "")
+    else() # ARM_TARGET_LANG STREQUAL "gcc"
+        set_target_properties(paddle_lite_jni PROPERTIES COMPILE_FLAGS "-flto -fdata-sections")
+    endif()
     target_sources(paddle_lite_jni PUBLIC ${__lite_cc_files} paddle_lite_jni.cc tensor_jni.cc)
     add_dependencies(paddle_lite_jni op_list_h kernel_list_h)
     if (LITE_WITH_NPU)

lite/tools/build.sh

@@ -395,7 +395,7 @@ function main {
                      echo
                      echo -e "error: only support gcc now, clang will be supported in future."
                      echo
-                     exit 1
+#                     exit 1
                 fi
                 shift
                 ;;