enable arm math lib

paddle/fluid/lite/arm/math/CMakeLists.txt

@@ -6,40 +6,77 @@ if(NOT (LITE_WITH_LIGHT_WEIGHT_FRAMEWORK AND LITE_WITH_ARM))
   return()
 endif()
 
-# TODO(xxx): seperate them
-lite_cc_library(math_arm SRCS
-    funcs.cc
-    packed_sgemm.cc
-    softmax.cc
-    scale.cc
-    pooling.cc
-    elementwise.cc
-    concat.cc
-    sgemv.cc
-    type_trans.cc
-    conv_impl.cc
-    conv_direct_3x3s1.cc
-    conv_direct_3x3s2.cc
-    conv_direct.cc
-    conv_depthwise_3x3_int7.cc
-    conv_depthwise_3x3_int8.cc
-    conv_depthwise_5x5s1_int8.cc
-    conv_depthwise_3x3p0.cc
-    conv_depthwise_3x3p1.cc
-    conv_depthwise_5x5s1.cc
-    conv_depthwise_5x5s2.cc
-    conv_depthwise.cc
-    conv_gemmlike.cc
-    conv_winograd_3x3.cc
-    conv_winograd.cc
-    split.cc
-    activation.cc
-    dropout.cc
-    gemm_prepacked_int8.cc
-    gemv_arm_int8.cc
-    conv3x3s1_direct_int8.cc
-    conv3x3s2_direct_int8.cc
-    DEPS ${lite_kernel_deps} eigen3 framework_proto_lite)
-  # TODO(TJ): fix me do not deps proto
- 
- 
+set(HAS_ARM_MATH_LIB_DIR OFF)
+# will search name as "libmath_arm.${os}.${abi}.${lang}.a"
+if(ARM_MATH_LIB_DIR AND EXISTS "${ARM_MATH_LIB_DIR}")
+  set(arm_math_name "")
+  if(ARM_TARGET_OS STREQUAL "android")
+    if(ARM_TARGET_ARCH_ABI STREQUAL "armv8")
+      set(arm_math_name "math_arm.android.armv8")
+    elseif(ARM_TARGET_ARCH_ABI STREQUAL "armv7")
+      set(arm_math_name "math_arm.android.armv7")
+    endif()
+  endif()
+
+  if(ARM_TARGET_OS STREQUAL "armlinux" )
+    if(ARM_TARGET_ARCH_ABI STREQUAL "armv8")
+      set(arm_math_name "math_arm.armlinux.armv8")
+    elseif(ARM_TARGET_ARCH_ABI STREQUAL "armv7")
+      set(arm_math_name "math_arm.armlinux.armv7")
+    endif()
+  endif()
+
+  if(ARM_TARGET_LANG STREQUAL "clang")
+    set(arm_math_name "${arm_math_name}.clang")
+  else()
+    set(arm_math_name "${arm_math_name}.gcc")
+  endif()
+
+  find_library(math_arm_file ${arm_math_name} ${ARM_MATH_LIB_DIR} NO_DEFAULT_PATH)
+  if(math_arm_file)
+    add_library(math_arm STATIC IMPORTED GLOBAL)
+    set_property(TARGET math_arm PROPERTY IMPORTED_LOCATION ${math_arm_file})
+    message(STATUS "ARM math library imported: ${math_arm_file}")
+    set(HAS_ARM_MATH_LIB_DIR ON)
+  else()
+    message(WARNING "Can not find arm math library ${arm_math_name} in ${ARM_MATH_LIB_DIR")
+  endif()
+endif()
+
+
+if (NOT HAS_ARM_MATH_LIB_DIR)
+  # TODO(xxx): seperate them and do not deps proto, eigen3
+  cc_library(math_arm SRCS  
+      funcs.cc 
+      packed_sgemm.cc 
+      softmax.cc 
+      scale.cc
+      pooling.cc
+      elementwise.cc
+      concat.cc
+      sgemv.cc
+      type_trans.cc
+      conv_impl.cc
+      conv_direct_3x3s1.cc
+      conv_direct_3x3s2.cc
+      conv_direct.cc
+      conv_depthwise_3x3_int7.cc
+      conv_depthwise_3x3_int8.cc
+      conv_depthwise_5x5s1_int8.cc
+      conv_depthwise_3x3p0.cc
+      conv_depthwise_3x3p1.cc
+      conv_depthwise_5x5s1.cc
+      conv_depthwise_5x5s2.cc
+      conv_depthwise.cc
+      conv_gemmlike.cc
+      conv_winograd_3x3.cc
+      conv_winograd.cc
+      split.cc
+      activation.cc
+      dropout.cc
+      gemm_prepacked_int8.cc
+      gemv_arm_int8.cc
+      conv3x3s1_direct_int8.cc
+      conv3x3s2_direct_int8.cc
+      DEPS ${lite_kernel_deps} eigen3 framework_proto_lite)
+endif()