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initLibUtil: Add exception handling self-check

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This commit is contained in:
Robert Hensing 2023-08-11 17:22:55 +02:00
parent 010dc7958e
commit c4dbb55ba9
3 changed files with 26 additions and 0 deletions
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17
src/libutil/util.cc
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@ -48,6 +48,23 @@ extern char * * environ __attribute__((weak));
namespace nix {
void initLibUtil() {
// Check that exception handling works. Exception handling has been observed
// not to work on darwin when the linker flags aren't quite right.
// In this case we don't want to expose the user to some unrelated uncaught
// exception, but rather tell them exactly that exception handling is
// broken.
// When exception handling fails, the message tends to be printed by the
// C++ runtime, followed by an abort.
// For example on macOS we might see an error such as
// 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.
bool caught = false;
try {
throwExceptionSelfCheck();
} catch (nix::Error _e) {
caught = true;
}
// This is not actually the main point of this check, but let's make sure anyway:
assert(caught);
}
std::optional<std::string> getEnv(const std::string & key)