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Dynamically allocate the alternate signal stack (#10266)
In Glibc 2.34 and later, SIGSTKSZ may not be a compile-time constant. It is no longer possible to statically allocate the alternate signal stack for the main thread, as we've been doing for the last 25 years. This commit implements dynamic allocation of the alternate signal stack even for the main thread. It reuses the code already in place to allocate the alternate signal stack for other threads. Fixes: #10250.
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