| 25 Sep 2025 |
 sterni | The only robust way of overridding a package that occurs multiple times in the dependency closure of a give package is to use overrideScope and recompiling (a large portion of) the dependency closure. | 11:00:42 |
| sterni | or do you mean something else by "not affected by"? | 11:01:07 |
 bglgwyng | No. your understanding is correct | 11:02:43 |
| bglgwyng | I should check for it now, but I'm so sure that I override every package depends on random with the same version of random | 11:03:14 |
| bglgwyng | So transitively depended random should be the same | 11:03:37 |
| bglgwyng | Even if I did so, does the problem you describe can occur for some reasons? | 11:04:05 |
| bglgwyng | Warning:
This package indirectly depends on multiple versions of the same package. This is very likely to cause a compile failure.
package hip (hip-1.5.6.0) requires random-1.2.1.3-37JdwX1MChN5J4YOL6CRA5
package temporary (temporary-1.3-D9AnthCRrFGJbyvBi0CXlS) requires random-1.2.1.3-wWDAMRL8k9YVWnjsPAPC
package linear (linear-1.23.2-3JDfk2hoPGIIa6oUPVB0FE) requires random-1.2.1.3-wWDAMRL8k9YVWnjsPAPC
package QuickCheck (QuickCheck-2.15.0.1-LDCjebZP9NmJJekAZt2vVq) requires random-1.2.1.3-wWDAMRL8k9YVWnjsPAPC
package random (random-1.2.1.3-37JdwX1MChN5J4YOL6CRA5) requires splitmix-0.1.1-JnFxtR8Qwyw2CyoVPkB8hj
package random (random-1.2.1.3-wWDAMRL8k9YVWnjsPAPC) requires splitmix-0.1.3.1-1AXCbj2oPlfCvSRlfGtm8v
package QuickCheck (QuickCheck-2.15.0.1-LDCjebZP9NmJJekAZt2vVq) requires splitmix-0.1.3.1-1AXCbj2oPlfCvSRlfGtm8v
I got this message, and I override random for every package depending on it
| 11:11:43 |
| bglgwyng | Hmm... I'm reading generic-builder.nix and found ${setupCommand} register --gen-pkg-config=$packageConfFile this code | 11:27:10 |
| bglgwyng | Maybe generic-builder doesn't explicitly passing overrided packages, but just putting them in package-db and letting cabal resolve it? | 11:27:36 |
 toonn | The different hashes do seem to indicate that they're different instances of the package, no? | 11:37:01 |
| bglgwyng | Yes they are different | 11:40:57 |
| bglgwyng | I wonder if generic-builder can distinguish them during build | 11:41:25 |
 maralorn | bglgwyng: I am not 100% sure but from my experience: Cabal will prefer the overriden one over the default except in the following situations:
- Some dependency is already using the default and none the override. (i.e. the only way to get a coherent build plan.)
- There is a constraint which prevents usage of the overriden one.
But this is really murky and I could be wrong.
| 11:54:31 |
| sterni | bglgwyng: the issue appears to be that you are building random with different versions of splitmix in these cases | 11:58:24 |
| sterni | so you need to make sure that the splitmix version is consistent as well | 11:58:33 |
