ci: add clang permutation, for 64bit only

Throw clang into the matrix, so we get a bit of extra coverage. As
evidenced by the disabled warning - it does catch extra issues.

Currently enabled only for 64bit builds, since fiddling with environment
variables and cross-files is more tricky than I can be asked atm x-D

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

.github/actions/setup-alpine/action.yml

@@ -14,6 +14,7 @@ runs:
         apk update
         apk add \
           build-base \
+          clang \
           eudev-dev \
           git \
           libusb-dev \

.github/actions/setup-archlinux/action.yml

@@ -16,6 +16,7 @@ runs:
         pacman --noconfirm -Sy archlinux-keyring
 
         pacman --noconfirm -Su \
+          clang \
           git \
           lib32-libusb \
           lib32-systemd \

.github/actions/setup-debian/action.yml

@@ -15,6 +15,7 @@ runs:
         apt-get update
         apt-get install --yes \
           build-essential \
+          clang \
           crossbuild-essential-i386 \
           gcc \
           git \

.github/actions/setup-fedora/action.yml

@@ -13,6 +13,7 @@ runs:
       run: |
         dnf update -y
         dnf install -y \
+          clang \
           gcc \
           git \
           kernel-devel \

.github/actions/setup-ubuntu/action.yml

@@ -15,6 +15,7 @@ runs:
         apt-get update
         apt-get install --yes \
           build-essential \
+          clang \
           crossbuild-essential-i386 \
           gcc \
           git \

.github/workflows/main.yml

@@ -18,17 +18,24 @@ permissions:
 
 jobs:
   build:
+    env:
+      CC: ${{ matrix.compiler }}
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
+        compiler: ['clang', 'gcc']
+        container:
+          - 'alpine:latest'
+          - 'archlinux:multilib-devel'
+          - 'debian:unstable'
+          - 'fedora:latest'
+          - 'ubuntu:24.04'
         include:
-          - container: 'alpine:latest'
           - container: 'archlinux:multilib-devel'
             crossfile: 'arch-cross.ini'
           - container: 'debian:unstable'
             crossfile: 'debian-cross.ini'
-          - container: 'fedora:latest'
           - container: 'ubuntu:24.04'
             crossfile: 'ubuntu-cross.ini'
 
@@ -75,11 +82,12 @@ jobs:
         run: meson dist -C build
 
       - name: configure (32bit)
-        if: ${{ matrix.crossfile != '' }}
+        if: ${{ matrix.crossfile != '' && matrix.compiler != 'clang' }}
         run: |
           cp .github/cross-files/${{ matrix.crossfile }} cross.ini
+          unset CC
           meson setup --native-file build-dev.ini --cross-file cross.ini build32
 
       - name: build (32bit)
-        if: ${{ matrix.crossfile != '' }}
-        run: meson compile -C build32
+        if: ${{ matrix.crossfile != '' && matrix.compiler != 'clang' }}
+        run: unset CC && meson compile -C build32

meson.build

@@ -18,7 +18,8 @@ cc = meson.get_compiler('c')
 add_project_arguments(
   cc.get_supported_arguments([
     '-Wbad-function-cast',
-    '-Wcast-align',
+    # should be removed and the code fixed
+    '-Wno-cast-align',
     '-Wchar-subscripts',
     '-Wempty-body',
     '-Wformat',