使用FFTW对Android未定义的引用 [英] Using FFTW on Android undefined references

问题描述

我想在我的Android应用程序中使用FFTW。我已遵循此教程并且能够在OSX上使用这个build.sh以浮点精度建立fftw：

  INSTALL_DIR =`pwd` jni / fftw3
 SRC_DIR =`pwd` /../ fftw-3.3.3
 NDK_ROOT =/ Users / awesomeUserName / Desktop / android-ndk-r9
 
 cd $ SRC_DIR 
 
 export 
 PATH =$ NDK_ROOT / toolchains / arm-linux-androideabi-4.8 / prebuilt / darwin-x86_64 / bin /：$ PATH
导出SYS_ROOT =$ NDK_ROOT / platforms / android-14 / arch-arm /
 export CC =arm-linux-androideabi-gcc --sysroot = $ SYS_ROOT
 export LD = linux-androideabi-ld
 export AR =arm-linux-androideabi-ar
 export RANLIB =arm-linux-androideabi-ranlib
 export STRIP =arm-linux- androideabi-strip
 
 mkdir -p $ INSTALL_DIR 
 ./configure --host = arm-eabi --build = i386-apple-darwin10.8.0 --prefix = $ INSTALL_DIR LIBS = -lc -lgcc--enable-float 
 
 make 
 make install 
 
 exit 0 
  

这将正确生成fftw3 / lib和fftw3 / include目录，一切似乎都很好。
然后我要编译这个.cpp文件：

  #include./fftw3/include/fftw3.h 
 
 externC{
 int FooPluginFunction（）
 {
 fftwf_complex * in，* out; 
 fftwf_plan p; 
 in =（fftwf_complex *）fftwf_malloc（sizeof（fftwf_complex）* 1024）; 
 out =（fftwf_complex *）fftwf_malloc（sizeof（fftwf_complex）* 1024）; 
 p = fftwf_plan_dft_1d（1024，in，out，FFTW_FORWARD，FFTW_ESTIMATE）; 
 fftwf_execute（p）; / *根据需要重复* / 
 fftwf_destroy_plan（p）; 
 fftwf_free（in）; fftwf_free（out）; 
 return 42; 
} 
} 
  

要生成共享库，请使用以下Android。 mk makefile：

  LOCAL_PATH：= $（call my-dir）
 
 include $（CLEAR_VARS） 
 
 LOCAL_MODULE：= fftw3 
 LOCAL_SRC_FILES：= fftw3 / lib / libfftw3f.a 
 LOCAL_EXPORT_CPPFLAGS：= fftw3 / include 
 include $（PREBUILT_STATIC_LIBRARY）
 
＃这里我们给出我们的模块名和源文件
 LOCAL_MODULE：= FooPlugin 
 LOCAL_SRC_FILES：= FooPlugin.cpp 
 LOCAL_SHARED_LIBRARIES：= fftw3f 
 include $（BUILD_SHARED_LIBRARY ）
  

当我运行Android.mk时，我得到一些未定义的引用错误， p>

  /Users/awesomeUsername/Desktop/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64 /bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld：./obj/local/armeabi/objs/ FooPlugin / FooPlugin.o：in function FooPluginFunction：jni / FooPlugin.cpp：8：error：undefined reference to'fftwf_malloc'
  
 
 
 
结构fftwf_complex和fftwf_plan很好，因为这些在fftw.h中定义，但fftwf_malloc，fftwf_free，fftwf_destroy，fftwf_plan_dft_1d等函数在fftw.f03中定义，似乎找不到编译器。
 
 
 
如何修改我的makefile，以便它找到并使用.f03文件，以便我可以在Android上使用fftw？
解决方案
我刚刚删除了--build参数和错误的错误
 
I'm trying to use FFTW in my Android application. I have followed this tutorial and was able to buid fftw with floating point precision using this build.sh, on OSX:
INSTALL_DIR="`pwd`/jni/fftw3"
SRC_DIR="`pwd`/../fftw-3.3.3"
NDK_ROOT="/Users/awesomeUserName/Desktop/android-ndk-r9"

cd $SRC_DIR

export
PATH="$NDK_ROOT/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/:$PATH"
export SYS_ROOT="$NDK_ROOT/platforms/android-14/arch-arm/"
export CC="arm-linux-androideabi-gcc --sysroot=$SYS_ROOT"
export LD="arm-linux-androideabi-ld"
export AR="arm-linux-androideabi-ar"
export RANLIB="arm-linux-androideabi-ranlib"
export STRIP="arm-linux-androideabi-strip"

mkdir -p $INSTALL_DIR
./configure --host=arm-eabi --build=i386-apple-darwin10.8.0 --prefix=$INSTALL_DIR LIBS="-lc -lgcc" --enable-float

make
make install

exit 0
This generates the fftw3/lib and fftw3/include directories correctly and everything seems fine.
I then want to compile this .cpp file:
#include "./fftw3/include/fftw3.h"

extern "C" {
  int FooPluginFunction ()
  {
     fftwf_complex *in, *out;
     fftwf_plan p;
     in = (fftwf_complex*) fftwf_malloc(sizeof(fftwf_complex) * 1024);
     out = (fftwf_complex*) fftwf_malloc(sizeof(fftwf_complex) * 1024);
     p = fftwf_plan_dft_1d(1024, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
     fftwf_execute(p); /* repeat as needed */
     fftwf_destroy_plan(p);
     fftwf_free(in); fftwf_free(out);
     return 42;
  }
} 
To generate a shared library, using the following Android.mk makefile:
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := fftw3
LOCAL_SRC_FILES := fftw3/lib/libfftw3f.a
LOCAL_EXPORT_CPPFLAGS := fftw3/include
include $(PREBUILT_STATIC_LIBRARY)

# Here we give our module name and source file(s)
LOCAL_MODULE    := FooPlugin
LOCAL_SRC_FILES := FooPlugin.cpp
LOCAL_SHARED_LIBRARIES := fftw3f
include $(BUILD_SHARED_LIBRARY)
When I run Android.mk, I get a few undefined reference errors like this one:
/Users/awesomeUsername/Desktop/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/FooPlugin/FooPlugin.o: in function FooPluginFunction:jni/FooPlugin.cpp:8: error: undefined reference to 'fftwf_malloc'
The structures fftwf_complex and fftwf_plan are fine because these are defined in fftw.h, but the functions fftwf_malloc, fftwf_free, fftwf_destroy, fftwf_plan_dft_1d, etc. are defined in fftw.f03, which doesn't seem to be found by the compiler.

How can I modify my makefile so that it finds and uses the .f03 files so that I can use fftw on Android?
解决方案
I just removed the --build parameter and the error disapeared

                        
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