Set minimum supported rust version to 1.77

CI test case included also.

Signed-off-by: Gris Ge <fge@redhat.com>

Author: cathay4t

.github/workflows/msrv.yml

@@ -0,0 +1,30 @@
+name: Minium Support Rust Version Test
+
+concurrency:
+  group: msrv-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+   types: [opened, synchronize, reopened]
+  push:
+    tags: ["v[0-9]+.[0-9]+.[0-9]+*"]
+
+jobs:
+  build_on_msrv:
+    strategy:
+      fail-fast: true
+      matrix:
+        include:
+          - msrv: "1.77"
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Install Rust ${{ matrix.msrv }}
+      run: rustup install ${{ matrix.msrv }}
+
+    - name: Build test
+      run: cargo +${{ matrix.msrv }} build --ignore-rust-version

Cargo.toml

@@ -3,7 +3,7 @@ authors = ["Corentin Henry <corentinhenry@gmail.com>"]
 name = "netlink-packet-route"
 version = "0.25.0"
 edition = "2021"
-
+rust-version = "1.77"
 homepage = "https://github.com/rust-netlink/netlink-packet-route"
 keywords = ["netlink", "linux"]
 license = "MIT"

src/route/lwtunnel.rs

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-use std::{fmt::Debug, net::Ipv6Addr};
+use std::{fmt::Debug, mem::size_of, net::Ipv6Addr};
 
 use netlink_packet_core::{
     emit_u16_be, emit_u64_be, parse_u16_be, parse_u64_be, parse_u8,
@@ -179,13 +179,13 @@ impl Nla for RouteIp6Tunnel {
     fn value_len(&self) -> usize {
         match self {
             Self::Unspecified => 0,
-            Self::Id(_) => const { size_of::<u64>() },
-            Self::Destination(_) => const { size_of::<Ipv6Addr>() },
-            Self::Source(_) => const { size_of::<Ipv6Addr>() },
-            Self::Hoplimit(_) => const { size_of::<u8>() },
-            Self::Tc(_) => const { size_of::<u8>() },
-            Self::Flags(_) => const { size_of::<u16>() },
-            Self::Other(_) => const { size_of::<DefaultNla>() },
+            Self::Id(_) => size_of::<u64>(),
+            Self::Destination(_) => size_of::<Ipv6Addr>(),
+            Self::Source(_) => size_of::<Ipv6Addr>(),
+            Self::Hoplimit(_) => size_of::<u8>(),
+            Self::Tc(_) => size_of::<u8>(),
+            Self::Flags(_) => size_of::<u16>(),
+            Self::Other(_) => size_of::<DefaultNla>(),
         }
     }