dpkg/automake/dpkg.m4

dnl Moved from configure.in, modified to use AC_DEFUN
dnl -- Tom Lees <tom@lpsg.demon.co.uk>

dnl DPKG_CACHED_TRY_COMPILE(<description>,<cachevar>,<include>,<program>,<ifyes>,<ifno>)
AC_DEFUN(DPKG_CACHED_TRY_COMPILE,[
 AC_MSG_CHECKING($1)
 AC_CACHE_VAL($2,[
  AC_TRY_COMPILE([$3],[$4],[$2=yes],[$2=no])
 ])
 if test "x$$2" = xyes; then
  true
  $5
 else
  true
  $6
 fi
])

dnl DPKG_C_GCC_TRY_WARNS(<warnings>,<cachevar>)
AC_DEFUN(DPKG_C_GCC_TRY_WARNS,[
 AC_MSG_CHECKING([GCC warning flag(s) $1])
 if test "${GCC-no}" = yes
 then
  AC_CACHE_VAL($2,[
   oldcflags="${CFLAGS-}"
   CFLAGS="${CFLAGS-} ${CWARNS} $1 -Werror"
   AC_TRY_COMPILE([
#include <string.h>
#include <stdio.h>
],[
    strcmp("a","b"); fprintf(stdout,"test ok\n");
], [$2=yes], [$2=no])
   CFLAGS="${oldcflags}"])
  if test "x$$2" = xyes; then
   CWARNS="${CWARNS} $1"
   AC_MSG_RESULT(ok)
  else
   $2=''
   AC_MSG_RESULT(no)
  fi
 else
  AC_MSG_RESULT(no, not using GCC)
 fi
])
dnl DPKG_CACHED_TRY_COMPILE(<description>,<cachevar>,<include>,<program>,<ifyes>,<ifno>)