函数'lseek64'的隐式声明在C99中无效

Question

I have got the following compile error while compiling the FFmpeg-Vitamio .

My OS is Mac OS X 10.10.9

NDK version: android-ndk-r10d

Gcc version:

$gcc --version
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.1.1
Thread model: posix

Error message:

libavformat/fd.c:59:9: error: implicit declaration of function 'lseek64' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    return lseek64(fd, pos, whence);

Answer 1

for a linux system, use:

#define _LARGEFILE64_SOURCE     /* See feature_test_macros(7) */
#include <sys/types.h>
#include <unistd.h>

to have a proper prototype for lseek64

I'm not sure how this will relate to the mac OS and using the arm-linux-antroideabi-gcc tool

Answer 2

@anton is right.

Wrong gcc is used,

${NDK_HOME}/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc

is supposed to used