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(autoconf.info)Standard Symbols

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Standard Symbols
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   All the generic macros that `AC_DEFINE' a symbol as a result of
their test transform their ARGUMENTs 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*)

will define the symbol `HAVE_STRUCT__EXPENSIVEP' if the check succeeds.