autoconf: Standard Symbols

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1 5.1.1 Standard Symbols
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1 All the generic macros that `AC_DEFINE' a symbol as a result of their
1 test transform their ARGUMENT values to a standard alphabet.  First,
1 ARGUMENT is converted to upper case and any asterisks (`*') are each
1 converted to `P'.  Any remaining characters that are not alphanumeric
1 are converted to underscores.
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1    For instance,
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1      AC_CHECK_TYPES([struct $Expensive*])
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1 defines the symbol `HAVE_STRUCT__EXPENSIVEP' if the check succeeds.
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