doc/bench: Added cmake build options to bench error messages

[kevkevinpal]

Motivation

I wanted to try and run the benchmarking scripts and I noticed the recovery benchmark in bench.c. I wanted to run but I was using cmake and the error message telling me to use ./configure -enable-module-recovery wasn't sufficient.

I figure rather than forcing users to look into the CMakeLists.txt file or anywhere else we should add this to the output

Solution

I appended to the message to include the -DSECP256K1_ENABLE_MODULE_...=ON in the message.

[real-or-random]

Thanks for spotting this. Maybe a simpler fix (which will be easier to maintain in the future) is to remove this line (or simply refer to the README).

[kevkevinpal]

Thanks for spotting this. Maybe a simpler fix (which will be easier to maintain in the future) is to remove this line (or simply refer to the README).

Sounds good I pushed 3b5b03f to replace the message with this instead:

"See README.md for configuration instructions.\n\n"

let me know if this looks good, I can reword or simply delete the print if that is wanted

[real-or-random]

utACK 3b5b03f

[hebasto]

ACK 3b5b03f, I have reviewed the code and it looks OK.

Another PR might also improve this comment:

secp256k1/include/secp256k1.h

Line 352 in 5c75183

* has been configured with --enable-external-default-callbacks. Then the