Macro: ac_check_symbol

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# ac_check_symbol

## Synopsis

`AC_CHECK_SYMBOL(SYMBOL, HEADER... [,ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]])`

## Version

1.1.1.1 (2001/07/26) guidod @ ac-archive-0.5.32

## Author

Guido Draheim <guidod@gmx.de>

## Description

a wrapper around AC_EGREP_HEADER the shellvar $ac_found will hold the HEADER-name that had been containing the symbol. This value is shown to the user.

## M4 Source Code

    AC_DEFUN(AC_CHECK_SYMBOL,
    [AC_MSG_CHECKING([for $1 in $2])
    AC_CACHE_VAL(ac_cv_func_$1,
    [AC_REQUIRE_CPP()dnl
    changequote(, )dnl
    symbol="[^a-zA-Z_0-9]$1[^a-zA-Z_0-9]"
    changequote([, ])dnl
    ac_found=no
    for ac_header in $2 ; do
      ac_safe=`echo "$ac_header" | sed 'y%./+-%__p_%' `
      if test $ac_found != "yes" ; then
          if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
                AC_EGREP_HEADER( $symbol, $ac_header, [ac_found="$ac_header"] )
          fi
      fi
    done
    if test "$ac_found" != "no" ; then
      AC_MSG_RESULT($ac_found)
      ifelse([$3], , :, [$3])
    else
      AC_MSG_RESULT(no)
      ifelse([$4], , , [$4
    ])dnl
    fi
    ])])

    dnl AC_CHECK_SYMBOLS( symbol..., header... [, action-if-found [, action-if-not-found]])
    AC_DEFUN(AC_CHECK_SYMBOLS,
    [for ac_func in $1
    do
    P4_CHECK_SYMBOL($ac_func, $2,
    [changequote(, )dnl
      ac_tr_func=HAVE_`echo $ac_func | sed -e 'y:abcdefghijklmnopqrstuvwxyz:ABCDEFGHIJKLMNOPQRSTUVWXYZ:' -e 's:[[^A-Z0-9]]:_:'`
    changequote([, ])dnl
      AC_DEFINE_UNQUOTED($ac_tr_func) $2], $3)dnl
    done
    ])