thodg/libgit2/cmake/Modules/FindStatNsec.cmake

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• Hash : df54c7fb
  Author :
  Date : 2019-06-27T07:34:43
  

  cmake: report whether we are using sub-second stat information Depending on the platform and on build options, we may or may not build libgit2 with support for nanoseconds when using `stat` calls. It's currently unclear though whether sub-second stat information is used at all. Add feature info for this to tell at configure time whether it's being used or not.

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• cmake/Modules/FindStatNsec.cmake

• INCLUDE(FeatureSummary)
  
  CHECK_STRUCT_HAS_MEMBER ("struct stat" st_mtim "sys/types.h;sys/stat.h"
  	HAVE_STRUCT_STAT_ST_MTIM LANGUAGE C)
  CHECK_STRUCT_HAS_MEMBER ("struct stat" st_mtimespec "sys/types.h;sys/stat.h"
  	HAVE_STRUCT_STAT_ST_MTIMESPEC LANGUAGE C)
  CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtime_nsec sys/stat.h
  	HAVE_STRUCT_STAT_MTIME_NSEC LANGUAGE C)
  
  IF (HAVE_STRUCT_STAT_ST_MTIM)
  	CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtim.tv_nsec sys/stat.h
  		HAVE_STRUCT_STAT_NSEC LANGUAGE C)
  ELSEIF (HAVE_STRUCT_STAT_ST_MTIMESPEC)
  	CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtimespec.tv_nsec sys/stat.h
  		HAVE_STRUCT_STAT_NSEC LANGUAGE C)
  ELSE ()
  	SET( HAVE_STRUCT_STAT_NSEC ON )
  ENDIF()
  
  IF (HAVE_STRUCT_STAT_NSEC OR WIN32)
  	OPTION( USE_NSEC		"Care about sub-second file mtimes and ctimes"	ON  )
  ELSE()
  	SET(USE_NSEC OFF)
  ENDIF()
  
  ADD_FEATURE_INFO(nanoseconds USE_NSEC "whether to use sub-second file mtimes and ctimes")
  

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