Rstan should reset environment variables it sets
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Description
See https://github.com/nlmixr2/nlmixr2/issues/253.
Rstan sets some environement variables: PKG_CPPFLAGS, PKG_LIBS and USE_CXX17. These variables interfere with other R packages using R CMD SHLIB, such as nlmixr2, and make them unable to run.
The fix is obvious: rstan should reset these changes after building a model.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing the RStan model-building path that sets PKG_CPPFLAGS, PKG_LIBS, and USE_CXX17, using the linked nlmixr2 issue for context. Confirm how these variables are changed during a build and verify that they are restored afterward so subsequent R CMD SHLIB builds are unaffected.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- r
- Domain
- build-system
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100