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  1. # ===========================================================================
  2. #       http://www.gnu.org/software/autoconf-archive/ax_prog_flex.html
  3. # ===========================================================================
  4. #
  5. # SYNOPSIS
  6. #
  7. #   AX_PROG_FLEX(ACTION-IF-TRUE,ACTION-IF-FALSE)
  8. #
  9. # DESCRIPTION
  10. #
  11. #   Check whether flex is the scanner generator. Run ACTION-IF-TRUE if
  12. #   successful, ACTION-IF-FALSE otherwise
  13. #
  14. # LICENSE
  15. #
  16. #   Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
  17. #   Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
  18. #
  19. #   This program is free software; you can redistribute it and/or modify it
  20. #   under the terms of the GNU General Public License as published by the
  21. #   Free Software Foundation; either version 2 of the License, or (at your
  22. #   option) any later version.
  23. #
  24. #   This program is distributed in the hope that it will be useful, but
  25. #   WITHOUT ANY WARRANTY; without even the implied warranty of
  26. #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  27. #   Public License for more details.
  28. #
  29. #   You should have received a copy of the GNU General Public License along
  30. #   with this program. If not, see <http://www.gnu.org/licenses/>.
  31. #
  32. #   As a special exception, the respective Autoconf Macro's copyright owner
  33. #   gives unlimited permission to copy, distribute and modify the configure
  34. #   scripts that are the output of Autoconf when processing the Macro. You
  35. #   need not follow the terms of the GNU General Public License when using
  36. #   or distributing such scripts, even though portions of the text of the
  37. #   Macro appear in them. The GNU General Public License (GPL) does govern
  38. #   all other use of the material that constitutes the Autoconf Macro.
  39. #
  40. #   This special exception to the GPL applies to versions of the Autoconf
  41. #   Macro released by the Autoconf Archive. When you make and distribute a
  42. #   modified version of the Autoconf Macro, you may extend this special
  43. #   exception to the GPL to apply to your modified version as well.
  44.  
  45. #serial 9
  46.  
  47. # mattst88:
  48. #     Replaced m4_ifnblank(...) with m4_ifval(m4_normalize(...), ...)
  49. #     since m4_ifnblank requires autoconf-2.64.
  50.  
  51. AC_DEFUN([AX_PROG_FLEX], [
  52.   AC_REQUIRE([AM_PROG_LEX])
  53.   AC_REQUIRE([AC_PROG_EGREP])
  54.  
  55.   AC_CACHE_CHECK([if flex is the lexer generator],[ax_cv_prog_flex],[
  56.     AS_IF([$LEX --version 2>/dev/null | $EGREP -q '^\<flex\>'],
  57.       [ax_cv_prog_flex=yes], [ax_cv_prog_flex=no])
  58.   ])
  59.   AS_IF([test "$ax_cv_prog_flex" = "yes"],
  60.     m4_ifval(m4_normalize([$1]), [[$1]]),
  61.     m4_ifval(m4_normalize([$2]), [[$2]])
  62.   )
  63. ])
  64.