Use trace() to get a bit more detail - .__C_compMatrix is looked for in the wrong environment with inherits=FALSE.
> setClassUnion("mMatrix", c("Matrix", "matrix")) Tracing get(name, envir = env) on entry x=".AllMTable", envir="<environment: 0x21dcf10>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(name, envir = env) on entry x=".MTable", envir="<environment: 0x2238cf0>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(name, envir = env) on entry x=".AllMTable", envir="<environment: 0x21dcf10>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get("#HAS_DUPLICATE_CLASS_NAMES", envir = .classTable) on entry x="#HAS_DUPLICATE_CLASS_NAMES", envir="<environment: 0x2787710>", topenv="<environment: base>", inherits=TRUE Tracing get(name, envir = env) on entry x=".AllMTable", envir="<environment: 0x21dcf10>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(name, envir = env) on entry x=".MTable", envir="<environment: 0x2238cf0>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(name, envir = env) on entry x=".MTable", envir="<environment: 0x21dcf10>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(".SigLength", envir = env) on entry x=".SigLength", envir="<environment: 0x21dcf10>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(".SigLength", envir = env) on entry x=".SigLength", envir="<environment: 0x21dcf10>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(name, envir = env) on entry x=".MTable", envir="<environment: 0x2238cf0>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(".SigLength", envir = env) on entry x=".SigLength", envir="<environment: 0x2238cf0>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(".SigLength", envir = env) on entry x=".SigLength", envir="<environment: 0x2238cf0>", topenv="<environment: namespace:methods>", inherits=TRUE Tracing get(cname, envir = cwhere, inherits = FALSE) on entry x=".__C__compMatrix", envir="<environment: R_GlobalEnv>", topenv="<environment: R_GlobalEnv>", inherits=FALSE Error in get(cname, envir = cwhere, inherits = FALSE) : object '.__C__compMatrix' not found ... Bill Dunlap TIBCO Software wdunlap tibco.com On Wed, Apr 8, 2020 at 7:52 AM William Dunlap <wdun...@tibco.com> wrote: > % R-devel --vanilla --quiet > > library(Matrix) > > setClassUnion("mMatrix", c("Matrix", "matrix")) > Error in get(cname, envir = cwhere, inherits = FALSE) : > object '.__C__compMatrix' not found > Error in setClassUnion("mMatrix", c("Matrix", "matrix")) : > unable to create union class: could not set members "Matrix" > > sessionInfo() > R Under development (unstable) (2020-04-07 r78175) > Platform: x86_64-pc-linux-gnu (64-bit) > Running under: Ubuntu 16.04.6 LTS > > Matrix products: default > BLAS/LAPACK: /usr/lib/libopenblasp-r0.2.18.so > > locale: > [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C > [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 > [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 > [7] LC_PAPER=en_US.UTF-8 LC_NAME=C > [9] LC_ADDRESS=C LC_TELEPHONE=C > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > other attached packages: > [1] Matrix_1.2-18 > > loaded via a namespace (and not attached): > [1] compiler_4.1.0 grid_4.1.0 lattice_0.20-41 > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > > On Wed, Apr 8, 2020 at 7:35 AM Martin Maechler <maech...@stat.math.ethz.ch> > wrote: > >> >>>>> renozao >> >>>>> on Mon, 30 Mar 2020 21:20:43 +0000 writes: >> >> > Hi, >> > when R CMD check is run under R-devel (2020-03-29 r78108) I get the >> following error at installation: >> >> > Error in get(cname, envir = cwhere, inherits = FALSE) : >> > object ‘.__C__compMatrix’ not found >> > Error in setClassUnion("mMatrix", c("Matrix", "matrix")) : >> > unable to create union class: could not set members "Matrix" >> >> > This does not happen on R 3.6.3. >> >> > I tried with Matrix listed in Depends but I still get the same >> error. >> >> > Is this linked to some changes in union classes or the Matrix >> package? >> >> > Thank you. >> >> > Bests, >> > Renaud >> >> Hi Renaud, >> One reason you got no response here, is because we don't even >> know about which package you are talking. >> >> So there's nothing, anybody can reproduce from your posting. >> >> There have been changes in R's dealing with class unions etc, >> notably even *relating* to an earlier bug report on class unions >> exactly for such a case which was *triggered* when people built >> on such Matrix classes. >> >> But we would really want to be able to reproduce what you are seeing.. >> >> Best regards, >> Martin Maechler >> >> ETH Zurich, R Core Team *and* maintainer("Matrix") >> >> ______________________________________________ >> R-package-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-package-devel >> > [[alternative HTML version deleted]] ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel