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Suppress warnings when -pedantic is passed and using std < c++20, which could
also be errors if -Werror is also passed as is the case with www/dooble.
error: use of the 'nodiscard' attribute is a C++20 extension
https://github.com/llvm/llvm-project/issues/32865
--- src/corelib/global/qcompilerdetection.h.orig 2025-05-28 10:22:57 UTC
+++ src/corelib/global/qcompilerdetection.h
@@ -966,7 +966,7 @@
# define Q_REQUIRED_RESULT [[nodiscard]]
#endif
-#if (defined(__cplusplus) && __has_cpp_attribute(nodiscard) >= 201907L /* used for both P1771 and P1301... */) \
+#if (defined(__cplusplus) && __has_cpp_attribute(nodiscard) >= 201907L && (!defined(Q_CC_CLANG) || __cplusplus >= 201907L) /* used for both P1771 and P1301... */) \
|| (!defined(__cplusplus) && __has_c_attribute(nodiscard) /* N2448 */)
// [[nodiscard]] constructor (P1771)
# ifndef Q_NODISCARD_CTOR
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