Add support for Clang 21 in CI

ednolan · ednolan · commit 4960d3087d89 · 2025-09-13T11:06:44.000-04:00
diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
@@ -72,7 +72,7 @@ jobs:
             }
           ],
           "clang": [
-            { "versions": ["20"],
+            { "versions": ["21"],
               "tests": [
                 {"cxxversions": ["c++26"],
                   "tests": [
@@ -91,7 +91,7 @@ jobs:
                 }
               ]
             },
-            { "versions": ["19", "18"],
+            { "versions": ["20", "19", "18"],
               "tests": [
                 { "cxxversions": ["c++26", "c++23", "c++20", "c++17"],
                   "tests": [
diff --git a/README.md b/README.md
@@ -122,7 +122,7 @@ unless the provided compiler supports **C++20** ranges.
 This project officially supports:
 
 * GCC versions 11–15
-* LLVM Clang++ (with libstdc++ or libc++) versions 17–20
+* LLVM Clang++ (with libstdc++ or libc++) versions 17–21
 * AppleClang version 15.0.0 (i.e., the [latest version on GitHub-hosted MacOS runners](https://github.com/actions/runner-images/blob/main/images/windows/Windows2022-Readme.md))
 * MSVC version 19.44.35211.0 (i.e., the [latest version on GitHub-hosted Windows runners](https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md))
 
diff --git a/cookiecutter/{{cookiecutter.project_name}}/.github/workflows/ci_tests.yml b/cookiecutter/{{cookiecutter.project_name}}/.github/workflows/ci_tests.yml
@@ -72,7 +72,7 @@ jobs:
             }
           ],
           "clang": [
-            { "versions": ["20"],
+            { "versions": ["21"],
               "tests": [
                 {"cxxversions": ["c++26"],
                   "tests": [
@@ -91,7 +91,7 @@ jobs:
                 }
               ]
             },
-            { "versions": ["19", "18"],
+            { "versions": ["20", "19", "18"],
               "tests": [
                 { "cxxversions": ["c++26", "c++23", "c++20", "c++17"],
                   "tests": [
diff --git a/cookiecutter/{{cookiecutter.project_name}}/README.md b/cookiecutter/{{cookiecutter.project_name}}/README.md
@@ -122,7 +122,7 @@ unless the provided compiler supports **C++20** ranges.
 This project officially supports:
 
 * GCC versions 11–15
-* LLVM Clang++ (with libstdc++ or libc++) versions 17–20
+* LLVM Clang++ (with libstdc++ or libc++) versions 17–21
 * AppleClang version 15.0.0 (i.e., the [latest version on GitHub-hosted MacOS runners](https://github.com/actions/runner-images/blob/main/images/windows/Windows2022-Readme.md))
 * MSVC version 19.44.35211.0 (i.e., the [latest version on GitHub-hosted Windows runners](https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md))
 

Original file line number	Diff line number	Diff line change
`@@ -72,7 +72,7 @@ jobs:`
`72`	`72`	`}`
`73`	`73`	`],`
`74`	`74`	`"clang": [`
`75`		`- { "versions": ["20"],`
	`75`	`+ { "versions": ["21"],`
`76`	`76`	`"tests": [`
`77`	`77`	`{"cxxversions": ["c++26"],`
`78`	`78`	`"tests": [`
`@@ -91,7 +91,7 @@ jobs:`
`91`	`91`	`}`
`92`	`92`	`]`
`93`	`93`	`},`
`94`		`- { "versions": ["19", "18"],`
	`94`	`+ { "versions": ["20", "19", "18"],`
`95`	`95`	`"tests": [`
`96`	`96`	`{ "cxxversions": ["c++26", "c++23", "c++20", "c++17"],`
`97`	`97`	`"tests": [`