1dnl Like AC_TRY_EVAL but also errors out if the compiler generates 2dnl _any_ output. Some compilers might issue warnings which we want 3dnl to catch. 4AC_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 8dnl Like AC_TRY_COMPILE but calls AC_TRY_EVAL2 instead of AC_TRY_EVAL 9AC_DEFUN([AC_TRY_COMPILE2], 10[cat > conftest.$ac_ext <<EOF 11[#]line __oline__ "configure" 12#include "confdefs.h" 13[$1] 14int main(void) { 15[$2] 16; return 0; } 17EOF 18if AC_TRY_EVAL2(ac_compile); then 19 ifelse([$3], , :, [rm -rf conftest* 20 $3]) 21else 22 echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD 23 cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD 24ifelse([$4], , , [ rm -rf conftest* 25 $4 26])dnl 27fi 28rm -f conftest*]) 29