vlfeat笔记
2020-03-23

cpp(Linux)

参考:https://www.vlfeat.org/gcc.html

向/etc/ld.so.conf.d/下任意一个文件(如opencv.conf)添加so库(例如libvl.so)的路径,然后sudo ldconfig

extern "C" {
  #include
}

int main (int argc, const char * argv[]) {
  VL_PRINT ("Hello world!") ;
  return 0;
}

g++ vl_test.cpp -o test -I$(VL) -L$(VL)/bin/glnxa64 -lvl

编译

单独使用sift模块

使用源文件

保留vl目录下所有文件
保留src下的sift.c和generic-driver.h

注释host.h部分代码(约665行)

/* Linux: limit glibc to old versions for compatibility */
// #if defined(VL_COMPILER_GNUC) & defined(VL_OS_LINUX) & ! defined(__DOXYGEN__)
// __asm__(".symver memcpy,memcpy@GLIBC_2.2.5");
// #endif

在vl下创建一个头文件fuck.h

#define FUCK_H

#define VL_DISABLE_AVX
#define VL_DISABLE_SSE2

在vl下的host.h,imopv_sse2.c头部添加

#if ! defined(FUCK_H)
#include "fuck.h"
#endif

CMakeLists.txt编写

# vlfeat
set(vlfeat_dir /home/lynx/fuck_mount/vlfeat/vlfeat_android)
include_directories(${vlfeat_dir})
aux_source_directory(/home/lynx/fuck_mount/vlfeat/vlfeat_android/src vl_src)
aux_source_directory(/home/lynx/fuck_mount/vlfeat/vlfeat_android/vl vl_head)
add_library(
  vlfeat_lib

  SHARED

  ${vl_src}
  ${vl_head}
)

# 添加目标文件/目标库
add_executable(
  entry

  source.cpp )

# 连接库文件
target_link_libraries(
  entry

  ${OpenCV_LIBS}
  # ${vlfeat_lib}
  vlfeat_lib
)

常见错误

找不到libiomp5.so

apt-file search libiomp5.so
sudo apt install libomp-7-dev

解除挂载的硬盘,make clean后重新编译

编译错误

vl/mathop.h:92:37: error: ‘vl_infinity_d’ not specified in enclosing ‘parallel’
   92 | #define VL_INFINITY_D (vl_infinity_d.value)

解决: /vl/kmeans.c(参考)

// #pragma omp parallel default(none)
#pragma omp parallel \

matlab模块错误

如果安装了texlive,那么makefile在检测时会把pdftex检测为matlab,直接把make/matlab.mak内容清空即可