ndk-build 使用 amadillo (blas lapack) 和 vlfeat lib

Posted 2023-02-19

【中文标题】ndk-build 使用 amadillo (blas lapack) 和 vlfeat lib

【英文标题】：ndk-build using amadillo (blas lapack) and vlfeat lib

【发布时间】：2015-05-03 13:42:20

【问题描述】：

我正在尝试编译使用犰狳编写的 c++ 代码，我在 config.hpp 中取消了对 blas lapack 的注释，并在 Andriod make 文件中取消了 vlfeat (vl.so)。

在 Jni 文件夹中，我有以下 Andriod.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
PRODUCT_PACKAGES += \libblas
PRODUCT_PACKAGES += \liblapack
PRODUCT_PACKAGES += \libvl



include $(CLEAR_VARS)
LOCAL_MODULE+=mjni
LOCAL_SRC_FILES+=HelloJNI.cpp
LOCAL_SRC_FILES+=featureExtraction.cpp

LOCAL_C_INCLUDES:=$(LOCAL_PATH)/include
LOCAL_C_INCLUDES+=$(LOCAL_PATH)/include/externalInclude/
LOCAL_C_INCLUDES+=$(LOCAL_PATH)/include/externalInclude/armadillo_bits


#LOCAL_SHARED_LIBRARIES := blas lapack
LOCAL_LDLIBS +=  -llog -ldl

LOCAL_CPP_FEATURES += exceptions
LOCAL_CPPFLAGS += -fexceptions


include $(BUILD_SHARED_LIBRARY)

对于每个模块 blas、lapack 和 vlfeat，我使用了 .so 库，如下所示：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := libvl

MY_LIBRARY_NAME := libvl

### export include path
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/../include/vl
LOCAL_EXPORT_C_INCLUDES += $(LOCAL_PATH)/../include/src

### path to library
LOCAL_SRC_FILES := libvl.so

### export dependency on the library
LOCAL_EXPORT_LDLIBS += -l$(MY_LIBRARY_NAME)

include $(PREBUILT_SHARED_LIBRARY)

和

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := libblas

MY_LIBRARY_NAME := libblas

### export include path
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/../include/OpenBLAS/include

### path to library
LOCAL_SRC_FILES := libblas.so

### export dependency on the library
LOCAL_EXPORT_LDLIBS += -l$(MY_LIBRARY_NAME)

include $(PREBUILT_SHARED_LIBRARY)

使用 ndk-build 命令时出现以下错误：

jni/include/externalInclude/armadillo_bits/blas_wrapper.hpp:172: error: undefined reference to 'sdot_'
jni/include/externalInclude/armadillo_bits/blas_wrapper.hpp:98: error: undefined reference to 'ssyrk_'
jni/include/externalInclude/armadillo_bits/blas_wrapper.hpp:28: error: undefined reference to 'sgemv_'
jni/include/externalInclude/armadillo_bits/blas_wrapper.hpp:63: error: undefined reference to 'sgemm_'

 error: undefined reference to 'vl_sift_new'
 error: undefined reference to 'vl_sift_process_first_octave'
 error: undefined reference to 'vl_sift_delete'
 error: undefined reference to 'vl_sift_detect'
 error: undefined reference to 'vl_sift_calc_keypoint_orientations'
 error: undefined reference to 'vl_sift_calc_keypoint_descriptor'
 error: undefined reference to 'vl_sift_process_next_octave'

【问题讨论】：

您找到解决链接问题的方法了吗？

【参考方案1】：

我也遇到了同样的问题，经过一番挣扎后，我发现了一个问题

转到http://danilogiulianelli.blogspot.co.il/2013/02/how-to-build-gcc-fortran-cross-compiler.html 并构建 gcc 交叉编译器。我是为 ndk-8d 做的。

确保在运行脚本后您可以看到脚本在其中创建的 2 个文件夹 android-ndk-r8d\toolchains\arm-linux-androideabi-4.8.0 android-ndk-r8b\android-ndk-r8d\toolchains\x86-4.8.

下载 blas lib 并更新 blas make.in 中的以下字段： 而不是

FORTRAN  = gfortran

FORTRAN = $(yourPath)/android-ndk-r8d/toolchains/x86-4.8.0/prebuilt/linux-x86/bin/i686-linux-android-gfortran

运行生成文件。

添加你的 android.mk 并添加以下 localflags

LOCAL_LDFLAGS           := $(OPT) $(PROF) -lblas -llapack -lstdc++ -lgfortran

运行 ndk-build

我遇到了 ndk-8d 的问题，它缺少 gcc 4.8 的文件，为了解决这个问题，我从 ndk-9 复制了丢失的文件，它可以工作。