RocksDB build fails on riscv64

[fauust]

Expected behavior

Build is OK

Actual behavior

Build fail with:

/usr/bin/ld: librocksdblib.a(memtable.cc.o): in function `.L0 ':
./builddir/storage/rocksdb/./storage/rocksdb/rocksdb/util/dynamic_bloom.h:177:
undefined reference to `__atomic_fetch_or_1'
/usr/bin/ld: librocksdblib.a(memtable.cc.o): in function `.LVL1731':
./builddir/storage/rocksdb/./storage/rocksdb/rocksdb/util/dynamic_bloom.h:179:
undefined reference to `__atomic_fetch_or_1'
/usr/bin/ld: librocksdblib.a(memtable.cc.o): in function `SaveValue':
./builddir/storage/rocksdb/./storage/rocksdb/rocksdb/db/memtable.cc:596:
undefined reference to `__atomic_compare_exchange_1'
/usr/bin/ld: librocksdblib.a(memtable.cc.o): in function `.L0 ':
/usr/include/c++/8/bits/atomic_base.h:434: undefined reference to
`__atomic_compare_exchange_1'
/usr/bin/ld: /usr/include/c++/8/bits/atomic_base.h:434: undefined
reference to `__atomic_compare_exchange_1'
/usr/bin/ld: /usr/include/c++/8/bits/atomic_base.h:434: undefined
reference to `__atomic_compare_exchange_1'
/usr/bin/ld: /usr/include/c++/8/bits/atomic_base.h:434: undefined
reference to `__atomic_compare_exchange_1'
/usr/bin/ld: librocksdblib.a(memtable.cc.o):/usr/include/c++/8/bits/atomic_base.h:434:
more undefined references to `__atomic_compare_exchange_1' follow
collect2: error: ld returned 1 exit status

See full log at: https://buildd.debian.org/status/fetch.php?pkg=mariadb-10.3&arch=riscv64&ver=1%3A10.3.16-1&stamp=1561225015&raw=0

Steps to reproduce the behavior

Build RocksDB on riscv64 arch.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=933151
https://jira.mariadb.org/browse/MDEV-23051

[adamretter]

@fauust AFAIK you are the first person to report about building on RiscV64. Congrats :-)

Do you know if there is any hardware available for Open Source projects, so that we can test this? We have kindly been given access to ppc64le, aarch64, and s390x by various groups, but we don't have a RISCv64 machine yet

[grooverdan]

successfully built per #7060. Runtime still unknown. For CI https://toolchains.bootlin.com/releases_riscv64.html downloads are painfully slow. If you can have them staticly installed that's probably ok.

[ottok]

Note that riscv64 is one of the official platforms of Ubuntu nowadays, so it is not only a marginal thing. See https://launchpad.net/ubuntu/+source/mariadb-10.3

[adamretter]

I believe that this is now fixed.