build-time hash

12:50 Mar 18, 2020 

but you have a clue that comes immediately after:

"during build-time of a program"

Programs are usually not written in a directly executable form - a program would need first to be converted in a form that the specific computer can understand and execute.

as explained here:

Software Build in simpler term is an activity to translate the human-readable source code into the efficient executable program.

Basically, Build is the process of creating the application program for a software release, by taking all the relevant source code files and compiling them and then creating a build artifacts, such as binaries or executable program, etc.

You can also say that the build process is a combination of several activities which varies for each programming language and for each operating system but please remember the basic concepts are universal.

https://scmquest.com/software-build-knowledge/

so a "build-time hash" would be a hash used at the time of "building" the executable form of the program, the point being to prevent any tampering of the executable code, once it has been "built".