Download M4 Source Macro History Category Index

ax_check_awk_user_defined_functions

Synopsis

AX_CHECK_AWK_USER_DEFINED_FUNCTIONS([ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])

Description

Check if AWK supports user defined functions. If successful execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.

This work is heavily based upon testawk.sh script by Heiner Steven. You should find his script (and related works) at <http://www.shelldorado.com/articles/awkcompat.html>. Thanks to Alessandro Massignan for his suggestions and extensive nawk tests on FreeBSD.

Author

Francesco Salvestrini <salvestrini@users.sourceforge.net>

Last Modified

2008-04-12

Cross References

group26-xrefs.png

M4 Source Code

AC_DEFUN([AX_CHECK_AWK_USER_DEFINED_FUNCTIONS],[
  AC_REQUIRE([AX_NEED_AWK])

  AC_MSG_CHECKING([if $AWK supports user defined functions])

  ax_awk_command=`echo "" | $AWK 'function mydouble(x) { return 2*x ; } ; { print mydouble(1) ; }' 2> /dev/null`
  AS_IF([test $? -eq 0],[
    AS_IF([test X"$ax_awk_command" = X"2"],[
      AC_MSG_RESULT([yes])
      $1
    ],[
      AC_MSG_RESULT([no])
      $2
    ])
  ],[
    AC_MSG_RESULT([no])
    $2
  ])
])

License

Copyright © 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.