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我正在使用 Intel 的 Compiler 13.1 在 Mac OS X 10.7.3 上编译 FFTW 3.1.2，在 align.c 中出现以下错误：

ifftw.h(122): warning #147: declaration is incompatible with "void *alloca(size_t={__darwin_size_t={unsigned long}})" (declared at line 36 of "/usr/include/alloca.h")
  void *alloca(size_t);
        ^

ifftw.h(154): catastrophic error: #error directive: sizeof void* is unknown!
  #    error sizeof void* is unknown!
       ^

配置脚本将其设置为零，并且 config.h 文件包含：

#define SIZEOF_VOID_P 0

即使我将其注释掉，我仍然会收到错误消息。该错误由 ifftw.h 和以下代码强制转换：

#ifndef HAVE_UINTPTR_T
#  if SIZEOF_VOID_P == 0
#    error sizeof void* is unknown!
#  elif SIZEOF_UNSIGNED_INT == SIZEOF_VOID_P
     typedef unsigned int uintptr_t;
#  elif SIZEOF_UNSIGNED_LONG == SIZEOF_VOID_P
     typedef unsigned long uintptr_t;
#  elif SIZEOF_UNSIGNED_LONG_LONG == SIZEOF_VOID_P
     typedef unsigned long long uintptr_t;
#  else
#    error no unsigned integer type matches void* sizeof!
#  endif
#endif

所以看起来void指针的大小不应该为零，但在我的情况下。在 Linux 上编译代码时并非如此。这里有什么问题？

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