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Experimental features in GNU m4

Certain features of GNU m4 are experimental.

Some are only available if activated by an option given to configure at GNU m4 installation time. The functionality might change or even go away in the future. Do not rely on it. Please direct your comments about it the same way you would do for bugs.

Changesyntax

An experimental feature, which would improve m4 usefulness, allows for changing the way the input is parsed (see section Changing the lexical structure of the input).

No compile time option is needed for changesyntax.

The implementation does not seem to slow down m4, more likely the contrary.

Changeword

An experimental feature, which would improve m4 usefulness, allows for changing the syntax for what is a word in m4. You should use:

./configure --enable-changeword

if you want this feature compiled in. The current implementation slows down m4 considerably and is hardly acceptable. So, it might go away, do not count on it yet.

Multiple precision arithmetic

Another experimental feature, which would improve m4 usefulness, allows for multiple precision rational arithmetic in eval. You should use:

./configure --with-gmp

if you want this feature compiled in. The current implementation is unproven and might go away. Do not count on it yet.


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