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MDEV-36217: Fix building with Clang and GCC on RISC-V #3871

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Mar 21, 2025
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MDEV-36217: Fix building with Clang and GCC on RISC-V #3871

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7 changes: 6 additions & 1 deletion include/my_cpu.h
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,12 @@ static inline void MY_RELAX_CPU(void)
/* Changed from __ppc_get_timebase for musl and clang compatibility */
__builtin_ppc_get_timebase();
#elif defined __GNUC__ && defined __riscv
__builtin_riscv_pause();
/* The GCC-only __builtin_riscv_pause() or the pause instruction is
encoded like a fence instruction with special parameters. On RISC-V
implementations that do not support arch=+zihintpause this
instruction could be interpreted as a more expensive memory fence;
it should not be an illegal instruction. */
__asm__ volatile(".long 0x0100000f" ::: "memory");
#elif defined __GNUC__
/* Mainly, prevent the compiler from optimizing away delay loops */
__asm__ __volatile__ ("":::"memory");
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