-latomics vs riscv64
[cc me please]
Dear riscv64 porters,
I am trying to get JPEG-XL to compile on riscv64. After reading of:
* https://github.com/riscv-collab/riscv-gcc/issues/12
I am under the impression that the black magic to get -latomic passed
on the linker line is handled somewhere in gcc spec file.
This also seems to be the case, per my reading of the log file at:
* https://buildd.debian.org/status/fetch.php?pkg=jpeg-xl&arch=riscv64&ver=0.7.0%7Egit20220120.0647da4%2Bds-3&stamp=1643404075&raw=0
The following c++11 code (1):
```
#include <atomic>
#include <cstdint>
std::atomic<uint64_t> num (0);
int main() {
uint64_t i = num.load(std::memory_order_relaxed);
return 0;
}
```
seems to compile and link nicely without the need for an explicit
`-latomic`. However somewhere later during the compilation, I receive
an error that:
/usr/bin/ld: libjxl_dec.so.0.7.0: undefined reference to `__atomic_fetch_and_1'
/usr/bin/ld: libjxl_dec.so.0.7.0: undefined reference to `__atomic_fetch_or_1'
So now it seems that I need an explicit `-latomic`
Could someone please share his knowledge on -latomic on riscv64 Debian
arch ? Please note that the above c++11 code rightfully fails to
compile on armel/mipsel and powerpc which allow the buildsystem to
detect the need for an explicit `-latomic` being added by cmake.
Thanks,
(1) https://salsa.debian.org/debian-phototools-team/libjxl/-/blob/master/debian/patches/atomics.patch
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