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b568535910
- introduce FAIRMQ_TEST_LD_LIBRARY_PATH, which prepends a directory to each test's environment via ctest, so the tests can run against an alternative runtime library (e.g. a tsan-instrumented libstdc++) - LD_LIBRARY_PATH rather than an injected rpath: an rpath added via the linker flags cannot precede the rpath spack's gcc adds through its specs file, so the compiler's own libstdc++ would keep winning the runtime search order - scoped per test on purpose: an instrumented library has unresolved __tsan_* symbols and must not be loaded into uninstrumented tools like cmake, ctest or ninja - fail the configuration instead of silently dropping the injection on CMake < 3.22 (ENVIRONMENT_MODIFICATION) - cover the example tests too; they share the instrumented runtime but not the locale-cache warmup (their main() is the installed public header). The custom-controller env block was dead before: it tested lsan_options, which only ever existed in the add_example() function scope, so the test also never received the LSan suppressions