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Collection of DPF-based plugins for packaging
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DPF-Plugins/plugins/ProM/projectM/m4/autoconf-archive/ax_c_arithmetic_rshift.m4

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  1. # ===========================================================================

  2. #  https://www.gnu.org/software/autoconf-archive/ax_c_arithmetic_rshift.html

  3. # ===========================================================================

  4. #

  5. # SYNOPSIS

  6. #

  7. #   AX_C_ARITHMETIC_RSHIFT

  8. #

  9. # DESCRIPTION

  10. #

  11. #   Checks if the right shift operation is arithmetic.

  12. #

  13. #   This macro uses compile-time detection and so is cross-compile ready.

  14. #

  15. # LICENSE

  16. #

  17. #   Copyright (c) 2008 YAMAMOTO Kengo <yamaken@bp.iij4u.or.jp>

  18. #

  19. #   Copying and distribution of this file, with or without modification, are

  20. #   permitted in any medium without royalty provided the copyright notice

  21. #   and this notice are preserved. This file is offered as-is, without any

  22. #   warranty.

  23. 

  24. #serial 9

  25. 

  26. AC_DEFUN([AX_C_ARITHMETIC_RSHIFT], [

  27.   AC_CACHE_CHECK([whether right shift operation is arithmetic],

  28.                  [ax_cv_c_arithmetic_rshift],

  29.                  [AC_COMPILE_IFELSE([[int dummy[((-1 >> 1) < 0) ? 1 : -1];]],

  30.                                     [ax_cv_c_arithmetic_rshift=yes],

  31.                                     [ax_cv_c_arithmetic_rshift=no])])

  32.   if test "x$ax_cv_c_arithmetic_rshift" = xyes; then

  33.     AC_DEFINE([HAVE_ARITHMETIC_RSHIFT], [1],

  34.               [Define to 1 if the right shift operation is arithmetic.])

  35.   fi

  36. ])