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LLVM: Switch native flag from -march=native to -mcpu=native for aarch64 #5139

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LLVM: Switch native flag from -march=native to -mcpu=native for aarch64 #5139

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LLVM: Switch native flag from -march=native to -mtune=native -mcpu=na…
Thyre Feb 25, 2026
185702e
Switch to -mcpu=native only
Thyre Feb 25, 2026
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3 changes: 2 additions & 1 deletion easybuild/toolchains/compiler/llvm_compilers.py
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Expand Up @@ -143,7 +143,8 @@ class LLVMCompilers(Compiler):
# used when 'optarch' toolchain option is enabled (and --optarch is not specified)
COMPILER_OPTIMAL_ARCHITECTURE_OPTION = {
**(Compiler.COMPILER_OPTIMAL_ARCHITECTURE_OPTION or {}),
(systemtools.AARCH64, systemtools.ARM): '-march=native',
# -march=native may not include all CPU features on aarch64, e.g. missing bf16 on Grace for LLVM 21.1.8
(systemtools.AARCH64, systemtools.ARM): '-mcpu=native -mtune=native',
(systemtools.POWER, systemtools.POWER): '-mcpu=native', # no support for march=native on POWER
(systemtools.POWER, systemtools.POWER_LE): '-mcpu=native', # no support for march=native on POWER
(systemtools.X86_64, systemtools.AMD): '-march=native',
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