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*]) 29
