AndroidConfig.h
AndroidConfig.h system\core\include\arch\Linux-arm
今天看android 的源码，发现一个这个配置文件，全是宏，觉得比较有意思，英文注释已经说明了它的作用，放到这。。。
/*
* Android config -- "android-arm". Used for ARM device builds.
*/
#ifndef _ANDROID_CONFIG_H
#define _ANDROID_CONFIG_H
/*
* ===========================================================================
* !!! IMPORTANT !!!
* ===========================================================================
*
* This file is included by ALL C/C++ source files. Don't put anything in
* here unless you are absolutely certain it can't go anywhere else.
*
* Any C++ stuff must be wrapped with "#ifdef __cplusplus". Do not use "//"
* comments.
*/
/*
* Threading model. Choose one:
*
* HAVE_PTHREADS - use the pthreads library.
* HAVE_WIN32_THREADS - use Win32 thread primitives.
* -- combine HAVE_CREATETHREAD, HAVE_CREATEMUTEX, and HAVE__BEGINTHREADEX
*/
#define HAVE_PTHREADS
/*
* Do we have pthread_setname_np()?
*
* (HAVE_PTHREAD_SETNAME_NP is used by WebKit to enable a function with
* the same name but different parameters, so we can't use that here.)
*/
#define HAVE_ANDROID_PTHREAD_SETNAME_NP
/*
* Do we have the futex syscall?
*/
#define HAVE_FUTEX
/*
* Define if we already have the futex wrapper functions defined. Yes if
* compiling against bionic.
*/
#define HAVE_FUTEX_WRAPPERS 1
/*
* Process creation model. Choose one:
*
* HAVE_FORKEXEC - use fork() and exec()
* HAVE_WIN32_PROC - use CreateProcess()
*/
#define HAVE_FORKEXEC
/*
* Process out-of-memory adjustment. Set if running on Linux,
* where we can write to /proc//oom_adj to modify the out-of-memory
* badness adjustment.
*/
#define HAVE_OOM_ADJ
/*
* IPC model. Choose one:
*
* HAVE_SYSV_IPC - use the classic SysV IPC mechanisms (semget, shmget).
* HAVE_MACOSX_IPC - use Macintosh IPC mechanisms (sem_open, mmap).
* HAVE_WIN32_IPC - use Win32 IPC (CreateSemaphore, CreateFileMapping).
* HAVE_ANDROID_IPC - use Android versions (?, mmap).
*/
#define HAVE_ANDROID_IPC
/*
* Memory-mapping model. Choose one:
*
* HAVE_POSIX_FILEMAP - use the Posix sys/mmap.h
* HAVE_WIN32_FILEMAP - use Win32 filemaps
*/
#define HAVE_POSIX_FILEMAP
/*
* Define this if you have
*/
#define HAVE_TERMIO_H
/*
* Define this if you have
*/
#define HAVE_SYS_SENDFILE_H 1
/*
* Define this if you build against MSVCRT.DLL
*/
/* #define HAVE_MS_C_RUNTIME */
/*
* Define this if you have sys/uio.h
*/
#define HAVE_SYS_UIO_H
/*
* Define this if your platforms implements symbolic links
* in its filesystems
*/
#define HAVE_SYMLINKS
/*
* Define this if we have localtime_r().
*/
/* #define HAVE_LOCALTIME_R */
/*
* Define this if we have gethostbyname_r().
*/
/* #define HAVE_GETHOSTBYNAME_R */
/*
* Define this if we have ioctl().
*/
#define HAVE_IOCTL
/*
* Define this if we want to use WinSock.
*/
/* #define HAVE_WINSOCK */
/*
* Define this if have clock_gettime() and friends
*/
#define HAVE_POSIX_CLOCKS
/*
* Define this if we have pthread_cond_timedwait_monotonic() and
* clock_gettime(CLOCK_MONOTONIC).
*/
#define HAVE_TIMEDWAIT_MONOTONIC
/*
* Define this if we have linux style epoll()
*/
#define HAVE_EPOLL
/*
* Endianness of the target machine. Choose one:
*
* HAVE_ENDIAN_H -- have endian.h header we can include.
* HAVE_LITTLE_ENDIAN -- we are little endian.
* HAVE_BIG_ENDIAN -- we are big endian.
*/
#define HAVE_ENDIAN_H
#define HAVE_LITTLE_ENDIAN
/*
* We need to choose between 32-bit and 64-bit off_t. All of our code should
* agree on the same size. For desktop systems, use 64-bit values,
* because some of our libraries (e.g. wxWidgets) expect to be built that way.
*/
/* #define _FILE_OFFSET_BITS 64 */
/* #define _LARGEFILE_SOURCE 1 */
/*
* Define if platform has off64_t (and lseek64 and other xxx64 functions)
*/
#define HAVE_OFF64_T
/*
* Defined if we have the backtrace() call for retrieving a stack trace.
* Needed for CallStack to operate; if not defined, CallStack is
* non-functional.
*/
#define HAVE_BACKTRACE 0
/*
* Defined if we have the dladdr() call for retrieving the symbol associated
* with a memory address. If not defined, stack crawls will not have symbolic
* information.
*/
#define HAVE_DLADDR 1
/*
* Defined if we have the cxxabi.h header for demangling C++ symbols. If
* not defined, stack crawls will be displayed with raw mangled symbols
*/
#define HAVE_CXXABI 0
/*
* Defined if we have the gettid() system call.
*/
#define HAVE_GETTID
/*
* Defined if we have the sched_setscheduler() call
*/
#define HAVE_SCHED_SETSCHEDULER
/*
* Add any extra platform-specific defines here.
*/
#ifndef __linux__
#define __linux__
#endif
/*
* Define if we have header
*/
#define HAVE_MALLOC_H
/*
* Define if we're running on *our* linux on device or emulator.
*/
#define HAVE_ANDROID_OS 1
/*
* Define if we have Linux-style non-filesystem Unix Domain Sockets
*/
#define HAVE_LINUX_LOCAL_SOCKET_NAMESPACE 1
/*
* Define if we have Linux's inotify in .
*/
#define HAVE_INOTIFY 1
/*
* Define if we have madvise() in
*/
#define HAVE_MADVISE 1
/*
* Define if tm struct has tm_gmtoff field
*/
#define HAVE_TM_GMTOFF 1
/*
* Define if dirent struct has d_type field
*/
#define HAVE_DIRENT_D_TYPE 1
/*
* Define if libc includes Android system properties implementation.
*/
#define HAVE_LIBC_SYSTEM_PROPERTIES 1
/*
* Define if system provides a system property server (should be
* mutually exclusive with HAVE_LIBC_SYSTEM_PROPERTIES).
*/
/* #define HAVE_SYSTEM_PROPERTY_SERVER */
/*
* What CPU architecture does this platform use?
*/
#define ARCH_ARM
/*
* Define if the size of enums is as short as possible,
*/
/* #define HAVE_SHORT_ENUMS */
/*
* sprintf() format string for shared library naming.
*/
#define OS_SHARED_LIB_FORMAT_STR "lib%s.so"
/*
* Do we have __memcmp16()?
*/
#define HAVE__MEMCMP16 1
/*
* type for the third argument to mincore().
*/
#define MINCORE_POINTER_TYPE unsigned char *
/*
* Do we have the sigaction flag SA_NOCLDWAIT?
*/
#define HAVE_SA_NOCLDWAIT
/*
* The default path separator for the platform
*/
#define OS_PATH_SEPARATOR '/'
/*
* Is the filesystem case sensitive?
*/
#define OS_CASE_SENSITIVE
/*
* Define if exists.
*/
#define HAVE_SYS_SOCKET_H 1
/*
* Define if the strlcpy() function exists on the system.
*/
#define HAVE_STRLCPY 1
/*
* Define if the open_memstream() function exists on the system.
*/
/* #define HAVE_OPEN_MEMSTREAM 1 */
/*
* Define if the BSD funopen() function exists on the system.
*/
#define HAVE_FUNOPEN 1
/*
* Define if prctl() exists
*/
#define HAVE_PRCTL 1
/*
* Define if writev() exists
*/
#define HAVE_WRITEV 1
/*
* Define if exists.
*/
#define HAVE_STDINT_H 1
/*
* Define if exists.
*/
#define HAVE_STDBOOL_H 1
/*
* Define if exists.
*/
#define HAVE_SCHED_H 1
/*
* Define if pread() exists
*/
#define HAVE_PREAD 1
/*
* Define if we have st_mtim in struct stat
*/
#define HAVE_STAT_ST_MTIM 1
/*
* Define if printf() supports %zd for size_t arguments
*/
#define HAVE_PRINTF_ZD 1
#endif /* _ANDROID_CONFIG_H */