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Description
Motivation
I am attempting to create a Nix package for an R application which uses Rcpp.
The nature of Nix is that all installed files are readonly in the Nix store.
Attempting to sourceCpp such an installed C++ file results in a file io error.
This is a showstopper for Nix packaging of anything using Rcpp I think. I can understand no good reason for not supporting readonly C++ sources.
Evidence
Working example with writable C++ source:
it23677> Rscript hello-rcpp-world.R Loading required package: Rcpp /nix/store/106z10g87sccpaw7n8pnwlalhpxnc85q-R-4.3.3/lib/R/bin/R CMD SHLIB -o 'sourceCpp_2.so' 'hello-cpp-world.cpp' using C++ compiler: ‘g++ (GCC) 13.2.0’ /nix/store/i53w7x986ifmgzvb8da6zkfms4xzmdrk-gcc-wrapper-13.2.0/bin/c++ -std=gnu++17 -I"/nix/store/106z10g87sccpaw7n8pnwlalhpxnc85q-R-4.3.3/lib/R/include" -DNDEBUG -I"/nix/store/yh83cz7v3vjw6r7nk05d55mkj77m3g3f-r-Rcpp-1.0.12/library/Rcpp/include" -I"/home/guestsi/vc/agr-github/RCpp-readonly-file-io-error" -fpic -g -O2 -c hello-cpp-world.cpp -o hello-cpp-world.o /nix/store/i53w7x986ifmgzvb8da6zkfms4xzmdrk-gcc-wrapper-13.2.0/bin/c++ -std=gnu++17 -shared -L/nix/store/106z10g87sccpaw7n8pnwlalhpxnc85q-R-4.3.3/lib/R/lib -o sourceCpp_2.so hello-cpp-world.o -L/nix/store/106z10g87sccpaw7n8pnwlalhpxnc85q-R-4.3.3/lib/R/lib -lR Hello CPP World Making it readonly breaks things:
it23677> chmod 444 hello-cpp-world.cpp it23677> Rscript hello-rcpp-world.R Loading required package: Rcpp Error: file io error: '/tmp/RtmpCCsssI/sourceCpp-x86_64-pc-linux-gnu-1.0.12/sourcecpp_277bc8f7c72b/hello-cpp-world.cpp' Execution halted Exception: Rscript exited with 1 [tty 10]:1:1-27: Rscript hello-rcpp-world.R hello-rcpp-world.R source:
require(Rcpp) sourceCpp(file = "hello-cpp-world.cpp", showOutput = TRUE) hello_cpp_world() hello-cpp-world.cpp source:
#include <iostream> using namespace std; // [[Rcpp::export]] void hello_cpp_world() { cout << "Hello CPP World" << endl; } Version and Platform
I am using Rcpp 1.0.12 with R 4.3.3 on NixOS 24.11. (NixOS is a Linux distro built with Nix.)
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