小编tit*_*ito的帖子

我正在编译一个名为"interrogate"的可执行文件:

g++ -o built/bin/interrogate -Lbuilt/lib -Lbuilt/tmp -L/usr/X11R6/lib \
built/tmp/interrogate_composite1.o built/tmp/interrogate_composite2.o \
-lp3cppParser -lp3dtool -lp3dtoolconfig -lp3pystub -pthread -ldl

编译后,当我尝试执行可执行文件时:

$ LD_LIBRARY_PATH=built/lib built/bin/interrogate
built/bin/interrogate: symbol lookup error: built/lib/libp3dtool.so.1.8: undefined symbol: _Py_NoneStruct

此符号由libp3pystub.so提供,但询问可执行文件没有对此库的任何引用(我使用了-lp3pystub):

$ LD_LIBRARY_PATH=built/lib ldd built/bin/interrogate
    linux-vdso.so.1 =>  (0x00007fff2016a000)
    libp3dtool.so.1.8 => built/lib/libp3dtool.so.1.8 (0x00007f498d57a000)
    libp3dtoolconfig.so.1.8 => built/lib/libp3dtoolconfig.so.1.8 (0x00007f498d51b000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f498d1f2000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f498cfdc000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f498cdbf000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f498c9ff000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f498c7fb000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f498c4ff000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f498d5bc000)

如果我手动加载libp3pystub.so,可执行文件的工作原理:

$ LD_PRELOAD=built/lib/libp3pystub.so LD_LIBRARY_PATH=built/lib built/bin/interrogate

Usage:
  interrogate [opts] file.C …

在经典的OpenGL应用程序中,在我们完成渲染帧之后,我们通常调用非gl方法将窗口缓冲区"翻转"到当前帧.

但我在WebGL中没有看到任何相关内容.它是如何工作的？

我正在构建一个用于从 Python 访问 Objective-C 的库。我一直在获取 iOS 上变量的地址。

假设我想获取以下指针地址CBCentralManagerScanOptionAllowDuplicatesKey：

NSString *key = CBCentralManagerScanOptionAllowDuplicatesKey;
NSLog(@"Address is: %p\n", key);

NSString *key2 = dlsym(RTLD_SELF, "CBCentralManagerScanOptionAllowDuplicatesKey");
NSLog(@"Address2 is: %p\n", key2);

我有：

Address is: 0x3a827fcc
Address2 is: 0x3a825514

为什么我会得到不同的值？我尝试查找RTLD_NEXT，仍然得到相同的值。Objective-C 变量是否以某种方式被破坏了？