我想鏈接我的程序與libjpeg。'未定義的引用'與g ++編譯時
臂的Mandriva-Linux的gnueabi-G ++ v4l2grab2.cpp -o v4l2grab -Wall -llib -ljpeg
錯誤:
v4l2grab2.cpp:(.text+0xa28): undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
v4l2grab2.cpp:(.text+0xa44): undefined reference to `jpeg_CreateCompress(jpeg_compress_struct*, int, unsigned int)'
v4l2grab2.cpp:(.text+0xa54): undefined reference to `jpeg_stdio_dest(jpeg_compress_struct*, _IO_FILE*)'
v4l2grab2.cpp:(.text+0xa88): undefined reference to `jpeg_set_defaults(jpeg_compress_struct*)'
v4l2grab2.cpp:(.text+0xaa4): undefined reference to `jpeg_set_quality(jpeg_compress_struct*, int, int)'
v4l2grab2.cpp:(.text+0xab4): undefined reference to `jpeg_start_compress(jpeg_compress_struct*, int)'
v4l2grab2.cpp:(.text+0xaf0): undefined reference to `jpeg_write_scanlines(jpeg_compress_struct*, unsigned char**, unsigned int)'
v4l2grab2.cpp:(.text+0xb1c): undefined reference to `jpeg_finish_compress(jpeg_compress_struct*)'
v4l2grab2.cpp:(.text+0xb28): undefined reference to `jpeg_destroy_compress(jpeg_compress_struct*)'
但是,當i中的文件重命名爲的* .c並嘗試編譯它與arm-mandriva-linux-gnueabi-gcc(而不是g ++)一切作品!
我真的需要在C++代碼中使用它。 如何使用g ++編譯此代碼?
聽起來就像是的libjpeg misbuilt。 –
C風格的函數聲明需要放在'extern「C」塊中 –