chore: update required_ruby_version to >= 2.7.0

rake-compiler-dock 1.10.0 dropped support for Ruby 2.6.

Author: ianks

.devcontainer/Dockerfile

@@ -4,7 +4,7 @@ FROM mcr.microsoft.com/vscode/devcontainers/rust:${VARIANT}
 ENV CHRUBY_VERSION="0.3.9" \
   BUILD_LIST="build-essential clang libclang-dev openssh-server" \
   DEBIAN_FRONTEND="noninteractive" \
-  RUBY_VERSIONS="2.6.9 2.7.6 3.1.2 3.2.0-preview2"
+  RUBY_VERSIONS="2.7.6 3.1.2 3.2.0-preview2"
 
 USER root
 

Gemfile

@@ -14,6 +14,6 @@ gem "base64", "~> 0.3.0"
 gem "yard"
 gem "mutex_m"
 
-if RUBY_VERSION >= "2.6.0"
+if RUBY_VERSION >= "2.7.0"
   gem "standard", "~> 1.12.1"
 end

Rakefile

@@ -78,7 +78,7 @@ task test: ["test:cargo", "test:gem", "test:examples"]
 desc "Pretty the files"
 task :fmt do
   sh "cargo fmt"
-  sh "bundle exec standardrb --fix" if RUBY_VERSION >= "2.6.0"
+  sh "bundle exec standardrb --fix" if RUBY_VERSION >= "2.7.0"
   Dir.chdir("docsite") do
     sh "npm run fmt"
   end
@@ -90,7 +90,7 @@ task format: [:fmt]
 
 desc "Lint"
 task :lint do
-  sh "bundle exec standardrb --format #{ENV.key?("CI") ? "github" : "progress"}" if RUBY_VERSION >= "2.6.0"
+  sh "bundle exec standardrb --format #{ENV.key?("CI") ? "github" : "progress"}" if RUBY_VERSION >= "2.7.0"
   sh "cargo fmt --check"
   sh "cargo clippy"
   sh "shellcheck $(git ls-files '*.sh')"

crates/rb-sys-env/readme.md

@@ -79,8 +79,6 @@ Here is an example of the `rustc-cfg` flags that are set by this crate:
 - `#[cfg(ruby_gt_2_4)]`
 - `#[cfg(ruby_gte_2_5)]`
 - `#[cfg(ruby_gt_2_5)]`
-- `#[cfg(ruby_gte_2_6)]`
-- `#[cfg(ruby_gt_2_6)]`
 - `#[cfg(ruby_gte_2_7)]`
 - `#[cfg(ruby_gt_2_7)]`
 - `#[cfg(ruby_gte_3_0)]`

crates/rb-sys/src/stable_api.rs

@@ -226,7 +226,6 @@ mod compiled;
 use compiled as api;
 
 #[cfg(stable_api_include_rust_impl)]
-#[cfg_attr(ruby_eq_2_6, path = "stable_api/ruby_2_6.rs")]
 #[cfg_attr(ruby_eq_2_7, path = "stable_api/ruby_2_7.rs")]
 #[cfg_attr(ruby_eq_3_0, path = "stable_api/ruby_3_0.rs")]
 #[cfg_attr(ruby_eq_3_1, path = "stable_api/ruby_3_1.rs")]

crates/rb-sys/src/stable_api/ruby_2_6.rs

@@ -8,7 +8,7 @@ ENV RUBY_TARGET="aarch64-mingw-ucrt" \
     RUSTUP_HOME="/usr/local/rustup" \
     CARGO_HOME="/usr/local/cargo" \
     PATH="/usr/local/cargo/bin:/llvm-mingw/bin:$PATH" \
-    LIBCLANG_PATH="/llvm-mingw/lib" \
+    LIBCLANG_PATH="/usr/lib/llvm-10/lib" \
     CC_aarch64_pc_windows_gnullvm="aarch64-w64-mingw32-clang" \
     CXX_aarch64_pc_windows_gnullvm="aarch64-w64-mingw32-clang++" \
     AR_aarch64_pc_windows_gnullvm="aarch64-w64-mingw32-ar" \