[SYCL][Test] Disable 2 failing tests on old libstdc++ via lit features#22562
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Both tests fail on RHEL 8.8/gcc 8.5. Add feature detection to sycl/test/lit.cfg.py, probing the predefined macros of the toolchain in use (modeled on libcxx's compilerMacros()): - glibcxx-ge-11: from _GLIBCXX_RELEASE, for device_only_no_iostream.cpp, whose root cause is <bits/stl_iterator.h> pulling in <ostream> on older libstdc++. - cpp_lib_span: from __cpp_lib_span with -std=c++20, for negative_test.cpp, whose root cause is <span> being unavailable on older libstdc++, not a C++20 language-mode issue. CMPLRLLVM-76646 Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
againull
approved these changes
Jul 7, 2026
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Both tests fail on RHEL 8.8/gcc 8.5.
Add feature detection to sycl/test/lit.cfg.py, probing the predefined macros of the toolchain in use (modeled on libcxx's compilerMacros()):
CMPLRLLVM-76646