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libxml2 2.9.1

    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*])