(autoconf.info)Standard Symbols

Next: Default Includes Up: Common Behavior

5.1.1 Standard Symbols

All the generic macros that `AC_DEFINE' a symbol as a result of their
test transform their ARGUMENT values to a standard alphabet.  First,
ARGUMENT is converted to upper case and any asterisks (`*') are each
converted to `P'.  Any remaining characters that are not alphanumeric
are converted to underscores.

   For instance,

     AC_CHECK_TYPES([struct $Expensive*])

defines the symbol `HAVE_STRUCT__EXPENSIVEP' if the check succeeds.

automatically generated by info2www