Added HAVE_INT128 test and variable to bitcoin-config.h

Calin Culianurequested to merge
cculianu/bitcoin-cash-node:add_config_have_int128 into master

Summary

In the future ABLA implementation, we will need to use the __int128 type (or emulate it if it's missing). As such, we need to add a cmake configure test for it.

A test for __int128 has been added to src/config/CMakeLists.txt and this variable will appear as defined to 0 or 1 in the generated ./src/config/bitcoin-config.h.

Test Plan

On your (presumably 64-bit) machine, regenerate the cmake configuration:

  • rm -fr build/ && mkdir build
  • cd build
  • cmake -GNinja ..

Next, verify that ./src/config/bitcoin-config.h contains the define: #define HAVE_INT128 1 (uncommented).

(Optional) Do the above on a machine that lacks the __i128 type (such as ARM-32)... and verify that the define appears as #define HAVE_INT128 0 in ./src/config/bitcoin-config.h.

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