Configure libatomic when needed#4
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Summary
configureprobe for C++ atomic compare/exchange link supportsrc/Makevarsfromsrc/Makevars.in-latomictoPKG_LIBSonly when the probe needs itMotivation
CRAN's
r-devel-linux-x86_64-debian-clangcheck currently fails while loadingnatcpp.so:The package compiles and links, but Debian clang 22 leaves this atomic runtime helper unresolved unless
libatomicis explicitly linked. RcppThread's thread pool uses atomic compare/exchange internally, so this can surface atdyn.load()time on that platform.Verification
R CMD build --no-build-vignettes /Users/jefferis/dev/R/natcppR CMD check --no-manual --no-build-vignettes /private/tmp/natcpp_0.3.0.tar.gzThe local check still exits later because this R session has locale/metadata startup warnings, but
checking whether package 'natcpp' can be installed ... OKand00install.outshows the package installs and loads successfully.