dnl Like AC_TRY_EVAL but also errors out if the compiler generates

dnl _any_ output. Some compilers might issue warnings which we want

dnl to catch.

AC_DEFUN([AC_TRY_EVAL2],

[{ (eval echo configure:__oline__: \"[$]$1\") 1>&AS_MESSAGE_LOG_FD; dnl

(eval [$]$1) 2>&AS_MESSAGE_LOG_FD; _out=`eval [$]$1 2>&1` && test "x$_out" = x; }])

dnl Like AC_TRY_COMPILE but calls AC_TRY_EVAL2 instead of AC_TRY_EVAL

AC_DEFUN([AC_TRY_COMPILE2],

[cat > conftest.$ac_ext <

[#]line __oline__ "configure"

#include "confdefs.h"

[$1]

int main(void) {

[$2]

; return 0; }

EOF

if AC_TRY_EVAL2(ac_compile); then

  ifelse([$3], , :, [rm -rf conftest*

  $3])

else

  echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD

  cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD

ifelse([$4], , , [  rm -rf conftest*

  $4

])dnl

fi

rm -f conftest*])