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      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__: \"[$]$1\") 1>&AC_FD_CC; dnl
      6 (eval [$]$1) 2>&AC_FD_CC; _out=`eval [$]$1 2>&1` && test "x$_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   $3])
     21 else
     22   echo "configure: failed program was:" >&AC_FD_CC
     23   cat conftest.$ac_ext >&AC_FD_CC
     24 ifelse([$4], , , [  rm -rf conftest*
     25   $4
     26 ])dnl
     27 fi
     28 rm -f conftest*])
     29