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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，在 Andriod make 文件中也取消了 vlfeat (vl.so) 的注释。

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'

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1 回答 1

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我遇到了同样的问题，经过一番挣扎后，我发现了一个问题

  1. 转到http://danigiulianelli.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
android-ndk-r8d\toolchains\arm-linux-androideabi-4.8.0
android-ndk-r8b\android-ndk-r8d\toolchains\x86中创建的 2 个文件夹-4.8。

  1. 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。

  1. 添加你的 android.mk 并添加以下 localflags

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

  2. 运行 ndk-build

    • 我遇到了 ndk-8d 的问题，它缺少 gcc 4.8 的文件，为了解决它，我从 ndk-9 复制了丢失的文件，它可以工作。
于 2015-05-07T11:16:06.853 回答