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<KombuchaKip>
I am having some minor difficulty porting a library I am co-maintainer of to riscv64. My build environment hiccups on looking for the intrinsic __builtin___atomic_fetch_add_4. This doesn't exist as far as I understand, but the externally implemented __atomic_fetch_add_4 in -latomic does. Suggestions welcome: https://github.com/pistacheio/pistache/issues/1000
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<davidlt>
KombuchaKip, you need to link to libatomic here
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<drmpeg>
So the T-Head Semi logo is an otter with it's brain removed? :)
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<jimwilson>
drmpeg, it is a honey badger, the nickname for that is the chinese name for T-Head, the top of the head is white
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<xentrac>
drmpeg: honey badger don't care!
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<KombuchaKip>
davidlt: Already doing that. -latomic provides __atomic_fetch_add_4, but not __builtin___atomic_fetch_add_4.
<jrtc27>
yeah because the builtin *is* __atomic_fetch_add_4
<jrtc27>
and the libcall has the same name
<jrtc27>
stdatomic.h and C++ atomic are both implemented in terms of the __atomic_foo builtins
<jrtc27>
no __builtin_ prefix
<jrtc27>
but you shouldn't generally be calling the builtins manually, you should be using the standard C or C++ interfaces that wrap them
<jrtc27>
even in configure scripts
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<KombuchaKip>
jrtc27: Got it. How would you recommend we test for it? The reason I ask is the compiler.has_function() meson extension checks by substituting the requested function, like sincos, here: https://github.com/mesonbuild/meson/issues/7652#issue-687321297
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<jrtc27>
KombuchaKip: in this case I would just delete the line in question
<jrtc27>
the next two lines make it redundant, since they verify *actual* code, not random intrinsics, works
<jrtc27>
you don't care whether C++ atomics are implemented with __atomic_load_4 or __lorem_ipsum_dolor_sit_amet, only that they work (when you link in libatomic, in this case)
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<KombuchaKip>
jrtc27: Ok great. That validates the solution I already tried, but wasn't sure if it was safe.
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