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Prior to GCC 14.1, the __builtin_riscv_pause() can cause an error if the
appropriate extension is not enabled in -march:
/tmp/ccR1L1lA.s: Assembler messages:
/tmp/ccR1L1lA.s:670: Error: unrecognized opcode `pause', extension `zihintpause' required
Link: https://gcc.gnu.org/pipermail/gcc-patches/2023-August/626748.html
Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=c2d04dd659c499d8df19f68d0602ad4c7d7065c2
Link: https://buildd.debian.org/status/fetch.php?pkg=bfs&arch=riscv64&ver=3.3.1-1&stamp=1717488400&raw=0
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