René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"switch to a whitelist for #include \u003cexecinfo.h\u003e","articleBody":"Build-time feature detection does not seem to be an option here, but I'd like to suggest using a whitelist for `backtrace()` functionality rather than an ever-growing stoplist (e.g., #1338, #796):\n\nhttps://github.com/RcppCore/Rcpp/blob/65707515bb392059bf10b773898cb67292d1ea41/inst/include/Rcpp/exceptions_impl.h#L24-L44\n\nWhat brought me here is that the `__MUSL__` exception (added long ago in #449) is an unreliable kludge as musl itself doesn't define such a macro ([by design](http://openwall.com/lists/musl/2013/03/29/13)).\n\nAFAICS, a suitable whitelist should be as simple as\n\n```C\ndefined(__GLIBC__) || defined(__APPLE__)\n```\n\nwhere execinfo is built-in. The additional compiler check (gcc|clang) seems to be redundant (probably a relict). The suggested change is similar in spirit to the original commit in #449, which was discarded simply because it forgot to cover macOS. BSDs have long provided execinfo, too, but a web search suggests they require separate linking with `-lexecinfo`.\n","author":{"url":"https://github.com/bastistician","@type":"Person","name":"bastistician"},"datePublished":"2025-10-20T15:06:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/1400/Rcpp/issues/1400"}