building rocksdb fails with new gcc v15

[conorsch]

Describe the bug
When building Penumbra, compilation of the rocksdb dependencies will fail if the system's version of is v15.1.1 or newer.

To Reproduce
Steps to reproduce the behavior:

1. Use a modern Linux OS like Fedora Workstation 42.
2. Run gcc --version and confirm >v15
3. Run cargo build --release
4. See error

Expected behavior
I expect all packages and binaries in the project to build, provided I've installed the necessary OS-level dependencies, as described in https://guide.penumbra.zone/dev/build

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
There are three workarounds:

• Use an older OS, such as Ubuntu 22.04 LTS, with a sufficiently old gcc
• Use the project's nix devshell which pins gcc at 13.3.0 as of Penumbra v1.5.3
• export ROCKSDB_LIB_DIR=/usr/lib64 prior to running cargo build -r

Any changes to core rocksdb dependencies will need to be made carefully, so as not to affect node storage logic. Additionally, changes must be made in both the protocol repo and in the cnidarium repo.

[hitchho]

https://github.com/rust-rocksdb/rust-rocksdb/pull/1007/files

upgrading to latest rocksdb should probably solve this

this workaround worked. but would be great if we can get this fixed for next release because this is quite a showstopper for new developers interested to build around penumbra.

$ cat .cargo/config.toml
# GCC 15 compatibility fix for RocksDB C++ compilation
[env]
# Add cstdint include for C++ files only (not assembly)
CXXFLAGS = "-include cstdint"