[External] undefined symbol errors when compiling package using ALTREP API

Tue, Jun 4, 2019 2:21 PM

thanks for clearing that up, so these methods are actually not meant to be
exported on Windows and OSX?
Some of the ALTREP methods that now use 'attribute_hidden' would be very
useful to packages that aim to be ALTREP aware, should the currently
(exported) API be considered final?

thanks  for your time & best,
Mark

On Tue, Jun 4, 2019 at 6:52 PM Tierney, Luke <luke-tierney at uiowa.edu> wrote:

On Tue, 4 Jun 2019, Mark Klik wrote:

Hello,

I'm developing a package (lazyvec) that makes full use of the ALTREP
framework (R >= 3.6.0).
One application of the package is to wrap existing ALTREP vectors in a

new

ALTREP vector and pass all calls from R to the contained object. The
purpose of this is to provide a diagnostic framework for working with
ALTREP vectors and show information about internal calls.

The package builds on Windows and OSX but fails to build on Linux as can

be

seen from the link to the Travis build:
https://travis-ci.org/fstpackage/lazyvec/jobs/539442806

The reason of build failure is that many ALTREP methods generate

'undefined

symbol' errors upon building the package (on Linux). I've checked the R
source code and the undefined symbols seems to be related to the
'attribute_hidden' before the function definition. For example, the

method

'ALTVEC_EXTRACT_SUBSET' is defined as:

SEXP attribute_hidden ALTVEC_EXTRACT_SUBSET(SEXP x, SEXP indx, SEXP call)

My question is why these differences between Windows / OSX and Linux

exist

and if they are intentional?

It is intentional that this not be part of the public API. This is
true of almost all functions with an ALTREP prefix. You need a
different approach that avoids using these directly.

Best,

luke

Do I need special build parameters to make sure my package builds

correctly

on Linux?

thanks for all the hard work!

best,
Mark

PS: some additional info:

package github repository: https://github.com/fstpackage/lazyvec
AppVeyor package build logs:
https://ci.appveyor.com/project/fstpackage/lazyvec
Travis package build logs:

https://travis-ci.org/fstpackage/lazyvec/builds

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[External] undefined symbol errors when compiling package using ALTREP API

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