But numerous sources1,2 indicate reproducible builds are very difficult (or even impossible) to implement in practice on major app stores.
Some reasons listed include:
- app store processes and idiosyncrasies that alter source code
- complexities in software versions and compilers
- app thinning
- any random generators in the build process
Usually, different compilations of the same code will not result in the same binary, even when using the same version of libraries, compiler, target, etc.
Given the concept of a 'reproducible build' is quite new, (its wiki page is less than 5 years old), and that methods may improve in coming years, is it reasonable to expect reproducible builds for entire apps in practice (i.e. on major app stores), or do insurmountable factors limit reproducible builds to being theoretically possible (and possible for a small subset of apps), but practically difficult if not impossible for most apps?