1  dnl Like AC_TRY_EVAL but also errors out if the compiler generates
 2  dnl _any_ output. Some compilers might issue warnings which we want
 3  dnl to catch.
 4  AC_DEFUN([AC_TRY_EVAL2],
 5  [{ (eval echo configure:__oline__: \"[$]$1\") 1>&AS_MESSAGE_LOG_FD; dnl
 6  (eval [$]$1) 2>&AS_MESSAGE_LOG_FD; _out=`eval [$]$1 2>&1` && test "x$_out" = x; }])
 7  
 8  dnl Like AC_TRY_COMPILE but calls AC_TRY_EVAL2 instead of AC_TRY_EVAL
 9  AC_DEFUN([AC_TRY_COMPILE2],
10  [cat > conftest.$ac_ext <<EOF
11  [#]line __oline__ "configure"
12  #include "confdefs.h"
13  [$1]
14  int main(void) {
15  [$2]
16  ; return 0; }
17  EOF
18  if AC_TRY_EVAL2(ac_compile); then
19    ifelse([$3], , :, [rm -rf conftest*
20    $3])
21  else
22    echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
23    cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
24  ifelse([$4], , , [  rm -rf conftest*
25    $4
26  ])dnl
27  fi
28  rm -f conftest*])