forked from lix-project/lix
initLibUtil: Add exception handling self-check
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010dc7958e
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@ -14,6 +14,11 @@ void BaseError::addTrace(std::shared_ptr<AbstractPos> && e, hintformat hint, boo
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err.traces.push_front(Trace { .pos = std::move(e), .hint = hint, .frame = frame });
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}
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void throwExceptionSelfCheck(){
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// This is meant to be caught in initLibUtil()
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throw SysError("C++ exception handling is broken. This would appear to be a problem with the way Nix was compiled and/or linked and/or loaded.");
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}
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// c++ std::exception descendants must have a 'const char* what()' function.
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// This stringifies the error and caches it for use by what(), or similarly by msg().
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const std::string & BaseError::calcWhat() const
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@ -214,4 +214,8 @@ public:
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}
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};
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/** Throw an exception for the purpose of checking that exception handling works; see 'initLibUtil()'.
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*/
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void throwExceptionSelfCheck();
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}
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@ -48,6 +48,23 @@ extern char * * environ __attribute__((weak));
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namespace nix {
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void initLibUtil() {
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// Check that exception handling works. Exception handling has been observed
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// not to work on darwin when the linker flags aren't quite right.
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// In this case we don't want to expose the user to some unrelated uncaught
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// exception, but rather tell them exactly that exception handling is
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// broken.
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// When exception handling fails, the message tends to be printed by the
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// C++ runtime, followed by an abort.
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// For example on macOS we might see an error such as
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// libc++abi: terminating with uncaught exception of type nix::SysError: error: C++ exception handling is broken. This would appear to be a problem with the way Nix was compiled and/or linked and/or loaded.
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bool caught = false;
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try {
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throwExceptionSelfCheck();
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} catch (nix::Error _e) {
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caught = true;
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}
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// This is not actually the main point of this check, but let's make sure anyway:
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assert(caught);
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}
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std::optional<std::string> getEnv(const std::string & key)
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