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meta-riscv: building curl, "undefined reference to '__atomic_exchange_1'
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Robert P. J. Day
on admittedly unsupported ubuntu 22.04 platform but it's clear this
is a known issue as it's pretty much identical to what one reads here: https://github.com/advancedtelematic/aktualizr/issues/1427 the explanation being that, "not every atomic operation is currently supported by GCC on RISC-V." oddly, building a riscv64 core-image-minimal once upon a time on fedora worked just fine, so i'm assuming a difference in gcc versions is what is causing this. what is the recommended workaround for this? rday
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Robert P. J. Day
On Thu, 7 Jul 2022, Robert P. J. Day wrote:
on admittedly unsupported ubuntu 22.04 platform but it's clear thisanother data point, matches exactly what i'm referring to: https://github.com/curl/curl/issues/9055 rday
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On Thu, Jul 7, 2022 at 6:14 AM Robert P. J. Day <rpjday@...> wrote:
does backporting https://github.com/curl/curl/commit/50efb0822aa0e0ab165158dd0a26e65a2290e6d2 to curl help ? rday
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Robert P. J. Day
On Thu, 7 Jul 2022, Khem Raj wrote:
On Thu, Jul 7, 2022 at 6:14 AM Robert P. J. Day <rpjday@...> wrote:it does indeed fix the curl build error, thanks. i haven't testeddoes backporting its operation yet, but getting a build was all i was after at the moment. rday
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Robert P. J. Day
On Thu, 7 Jul 2022, Khem Raj wrote:
On Thu, Jul 7, 2022 at 6:14 AM Robert P. J. Day <rpjday@...> wrote:as i read it, this issue is also related to -pthread versusdoes backporting -lpthread: https://blog.jiejiss.com/A-RISC-V-gcc-pitfall-revealed-by-a-glibc-update/ rday
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On Thu, Jul 7, 2022 at 1:06 PM Robert P. J. Day <rpjday@...> wrote:
this would mean that you want to rely on side effects of -pthread which may work with gcc but may not work with clang or other compiler drivers. The issue you have is that some variables are needing atomics and solution is either you link with libatomic or avoid using the code which needs them https://blog.jiejiss.com/A-RISC-V-gcc-pitfall-revealed-by-a-glibc-update/
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Robert P. J. Day
On Thu, 7 Jul 2022, Khem Raj wrote:
On Thu, Jul 7, 2022 at 1:06 PM Robert P. J. Day <rpjday@...> wrote:so while i'm still trying to wrap my head around all this, whatthis would mean that you want to rely on side effects of -pthread *would* be the ideal resolution for this? the link above suggests the simple solution of introducing a gcc config option "--always-link-libatomic". would that solve all this in a general way, not just for RISC-V? rday
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On Thu, Jul 7, 2022 at 2:01 PM Robert P. J. Day <rpjday@...> wrote: On Thu, 7 Jul 2022, Khem Raj wrote: Probably, but again if you need a function from a library you include it on linker cmdline if it’s intrinsics then compiler driver doing the needed is best way Preferably without introducing compiler specific options
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