[Rcpp-devel] Troubleshooting dependency issues

[Dirk Eddelbuettel]

Hi Naeem,

On 14 July 2021 at 09:41, Naeem Khoshnevis wrote:
| Hi,
| 
| I hope this email finds you well.
| I wondered what the best approaches to troubleshooting C++ dependencies
| issues in general and specifically in R are; specifically, those packages
| which are using OpenMP and we want to install on macOS.

Is this dependencies (plural) or a single core dependency (singular) on a
single OS (macOS) ?  Those are different issues. (And Rcpp has no incluence
over what Cupertino (macOS) or Auckland (macOS deployment for R does) -- we
have to play the card we are dealt, and that have always been "issues" and
some HOWTOs and duct tape.  On the margin, if this is your question, it may
also be one for r-sig-mac.

Also, and to make this concrete: Do you have a minimally reproducible issue?

| So far, I am just googling the error and finding out what the problem is.
| However, it is hard to address issues and come up with long-term solutions
| without internalizing the concepts.
| One example is creating a conda environment for each R package project and
| installing llvm, clang, etc into each environment.

As an R developer, I have a simple rule: Just say No to conda. Mixing and
matching between standard / core builds (using the recommended R toolchain)
and conda appears to mostly end in tears.

| I talked to several software engineers; however, I could not find a
| convincing answer. I think I do not know what I do not know about this
| topic, which prevents me from asking good questions. I would be grateful if
| you could let me know your thoughts about these questions.

Again, a reproducible example would help.

Rcpp is used by over 2300 packages on CRAN. Many use OpenMP. You can search
at GitHub within the mirroring 'cran' organisation to see what other packages
do. Given that you can also see the outcome (the package 'status' pages at
CRAN) that is not a bad approach.

Dirk

| Where is a good place to start learning about this topic?
| Is a professional C++ developer necessarily good at troubleshooting
| problems with compilers and linkers? Or these are two different topics.
| 
| Best regards,
| Naeem Khoshnevis
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