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

2006-10-13

Guido U. Draheim <guidod@gmx.de>

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

cryp.to ac-archive's C Support (released)

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.

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
])