Bug 827944

Summary:	sci-physics/root: 'vmc' flag is no longer supported after version 6.25.01
Product:	Gentoo Linux	Reporter:	Phireh
Component:	Current packages	Assignee:	Guilherme Amadio <amadio>
Status:	RESOLVED INVALID
Severity:	minor	CC:	sci-physics
Priority:	Normal
Version:	unspecified
Hardware:	AMD64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Phireh 2021-12-01 16:17:00 UTC

ROOT stopped supporting vmc (virtual monte carlo library) with version 6.25.01. However sci-physics/root-9999 still shows it as a valid flag. The compilation fails if you toggle it.

Reproducible: Always

Steps to Reproduce:
1. Add 'vmc' to sci-physics/root-9999 USE flags
2. Emerge it
3. Build fails at src_configure phase
Actual Results:  
I got this error from cmake:

CMake Error at cmake/modules/RootBuildOptions.cmake:415 (message):
  >>> Option 'vmc' is no longer supported in ROOT 6.25.01.
Call Stack (most recent call first):
  CMakeLists.txt:157 (include)

Comment 1 Guilherme Amadio gentoo-dev

2021-12-03 15:27:31 UTC

ROOT upstream has deprecated and removed vmc, which is now a separate package that you can install in Gentoo: sci-physics/vmc. Since the live ebuild for ROOT can still be used to build/test old versions of ROOT that include vmc, I left the flag there on purpose, so the fact it's there is not actually a bug. I will eventually remove it, though.