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[DRAFT] Fix/support cross-compiling packages depending on RcppParallel & TBB #52

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[DRAFT] Fix/support cross-compiling packages depending on RcppParallel & TBB #52

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40eeb14
rcpp fix test
andrjohns Jun 12, 2025
a654293
Update and doc
andrjohns Jun 12, 2025
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21 changes: 21 additions & 0 deletions R/build.R
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Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,7 @@ wasm_build <- function(pkg, tarball_path, contrib_bin, compress) {
break
}
}


# Setup environment for wasm compilation
webr_root <- getOption("rwasm.webr_root")
Expand All @@ -170,6 +171,26 @@ wasm_build <- function(pkg, tarball_path, contrib_bin, compress) {
sprintf("EM_PKG_CONFIG=%s", Sys.which("pkg-config")),
sprintf("EM_PKG_CONFIG_PATH=%s/wasm/lib/pkgconfig", webr_root)
)

# If package requires linking against RcppParallel & the TBB, download
# a version of RcppParallel compiled for WASM and set include/lib paths
# for the build
if ("RcppParallel" %in% pak::pkg_deps(paste0("local::", tarball_path))$package) {
if (!dir.exists(file.path(tmp_dir, "RcppParallel"))) {
rcppparallel_tar <- file.path(tmp_dir, "rcppparallel.tgz")
download.file(
"https://rcppcore.r-universe.dev/bin/emscripten/contrib/4.5/RcppParallel_5.1.10.9000.tgz",
rcppparallel_tar,
mode = "wb"
)
untar(rcppparallel_tar, exdir = tmp_dir)
}
webr_env <- c(
webr_env,
paste0("TBB_INC=", file.path(tmp_dir, "RcppParallel", "include")),
paste0("TBB_LIB=", file.path(tmp_dir, "RcppParallel", "lib"))
)
}

# Need to use an empty library otherwise R might try to load wasm packages
# from the library and fail
Expand Down