LLVM:在OSX上优化加载失败

Question

我正在尝试运行这个LLVM instrumentation项目，但是我只能在Linux下加载instrumentation优化。

我已经在OSX上编译并安装了LLVM 3.2和Clang 3.2，并且在Linux上有相同的版本。

当我尝试在Linux中运行时:

command opt -load ./obj/llvminstrument/libllvminstrument.so -help |grep instrum
    -insert-edge-profiling                     - Insert instrumentation for edge profiling
    -insert-gcov-profiling                     - Insert instrumentation for GCOV profiling
    -insert-optimal-edge-profiling             - Insert optimal instrumentation for edge profiling
    -insert-path-profiling                     - Insert instrumentation for Ball-Larus path profiling
    -instrument_block                          - Injects block instrumentation instructions
    -instrument_function                       - Injects function instrumentation instructions
    -instrument_prepare                        - Prepares instrumentation instructions

相同的命令，在OSX中:

command opt -load ./obj/llvminstrument/libllvminstrument.dylib -help |grep instrum    │········
opt: CommandLine Error: Argument 'track-memory' defined more than once!                                                  │········
opt: CommandLine Error: Argument 'debug-buffer-size' defined more than once!                                             │········
opt: CommandLine Error: Argument 'print-all-options' defined more than once!                                             │········
opt: CommandLine Error: Argument 'print-options' defined more than once!                                                 │········
opt: CommandLine Error: Argument 'print-after-all' defined more than once!                                               │········
opt: CommandLine Error: Argument 'print-before-all' defined more than once!                                              │········
opt: CommandLine Error: Argument 'track-memory' defined more than once!                                                  │········
opt: CommandLine Error: Argument 'debug-buffer-size' defined more than once!                                             │········
opt: CommandLine Error: Argument 'print-all-options' defined more than once!                                             │········
opt: CommandLine Error: Argument 'print-options' defined more than once!                                                 │········
opt: CommandLine Error: Argument 'print-after-all' defined more than once!                                               │········
opt: CommandLine Error: Argument 'print-before-all' defined more than once!                                              │········
    -insert-edge-profiling                     - Insert instrumentation for edge profiling                               │········
    -insert-gcov-profiling                     - Insert instrumentation for GCOV profiling                               │········
    -insert-optimal-edge-profiling             - Insert optimal instrumentation for edge profiling                       │········
    -insert-path-profiling                     - Insert instrumentation for Ball-Larus path profiling

Answer 1

我不知道如何解决这个问题，但问题是你将几个核心LLVM库静态地链接到仪表dylib中，这种方式与opt驱动程序"打开"的方式不兼容。因此，当您打开它时，您将获得各种命令行参数的重复全局变量。这可能与LLVM关系不大，更多的是与OS X上使用的特定构建过程有关，它们对符号可见性和/或共享链接与静态链接的默认值不同。