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e3d2277d51
Make __aarch64_cpu_features unconditionally available. This permits the unconditional use of this global inside __arm_get_current_vg, which was introduced in r16-7637-g41b4a73f370116. For now this global is only initialised when <sys/auxv.h> is available, but we can extend this in future to support other ways of initialising the bits used for SME support, and use this remove __aarch64_have_sme. This approach was recently adopted by LLVM. This patch does introduce an inconsistency with __aarch64_have_sme when <sys/auxv.h> is unavailable. However, this doesn't introduce any regressions, because one of the following conditions will hold: 1. SVE is enabled at compile time whenever we use a streaming or streaming compatible function. In this case the compiler won't need to use __arm_get_current_vg, so it doesn't matter if it gives the wrong answer. 2. There is a use of a streaming or streaming compatible function when we don't know whether SVE is enabled. In order to get correct DWARF unwind information, we then have to be able to test for SVE availability at runtime. This isn't possible until a working __arm_get_current_vg implementation is available, so the configuration has never (yet) been supported. libgcc/ChangeLog: PR target/124333 * config/aarch64/cpuinfo.c: Define __aarch64_cpu_features unconditionally.
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