64-bit mode by default?

[evanbiederstedt]

Hi @brianwalenz @aphillippy

Not a high priority issue:

I wonder if it would make sense to have MUMmer3 compile in 64-bit mode by default (i.e. add this to the Makefile) or perhaps add a line in the README recommending that users to do this.

For potential users, I think it might save some time/reduce potential confusion.

I ran into the following issue:

suffix tree construction failed: textlen=3209286560 larger than maximal textlen=536870908
ERROR: mummer and/or mgaps returned non-zero

which is solved by just recompiling with make CPPFLAGS="-O3 -DSIXTYFOURBITS"

If it's worth your time, I could make a quick PR.

Best, Evan

[evanbiederstedt]

Related to #6