feat(CI): C++20 build (#8952)

.github/workflows/cpp20.yml

@@ -0,0 +1,45 @@
+name: C++20
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+
+concurrency:
+  group: ${{ github.head_ref }} || concat(${{ github.ref }}, ${{ github.workflow }})
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    name: C++20
+    env:
+      COMPILER: clang
+      ENABLE_CPP_20: 1
+    if: github.repository == 'azerothcore/azerothcore-wotlk'
+    steps:
+      - uses: actions/checkout@v2
+      - name: Cache
+        uses: actions/cache@v2
+        with:
+          path: var/ccache
+          key: ccache:C++20:${{ github.ref }}:${{ github.sha }}
+          restore-keys: |
+            ccache:C++20:${{ github.ref }}
+            ccache:C++20
+      - name: Configure OS
+        run: source ./acore.sh install-deps
+        env:
+          CONTINUOUS_INTEGRATION: true
+      - name: Create conf/config.sh
+        run: source ./apps/ci/ci-conf.sh
+      - name: Import db
+        run: source ./apps/ci/ci-import-db.sh
+      - name: Build
+        run: source ./apps/ci/ci-compile.sh
+      - name: Dry run
+        run: source ./apps/ci/ci-worldserver-dry-run.sh
+      - name: Check startup errors
+        run: source ./apps/ci/ci-error-check.sh
+      - name: Run unit tests
+        run: source ./apps/ci/ci-run-unit-tests.sh

apps/ci/ci-conf.sh

@@ -19,6 +19,10 @@ DB_AUTH_CONF="MYSQL_USER='root'; MYSQL_PASS='root'; MYSQL_HOST='localhost';"
 DB_WORLD_CONF="MYSQL_USER='root'; MYSQL_PASS='root'; MYSQL_HOST='localhost';"
 CONFIG_SH
 
+if [[ $ENABLE_CPP_20 -eq 1 ]]; then
+  echo "CUSE_CPP_20=ON" >> ./conf/config.sh
+fi
+
 case $COMPILER in
 
   # this is in order to use the "default" gcc version of the OS, without forcing a specific version

apps/compiler/includes/functions.sh

@@ -67,9 +67,18 @@ function comp_configure() {
 
   cmake $SRCPATH -DCMAKE_INSTALL_PREFIX=$BINPATH $DCONF -DSERVERS=$CSERVERS \
   -DSCRIPTS=$CSCRIPTS \
+  -DUSE_CPP_20=$CUSE_CPP_20 \
   -DBUILD_TESTING=$CBUILD_TESTING \
-  -DTOOLS=$CTOOLS -DUSE_SCRIPTPCH=$CSCRIPTPCH -DUSE_COREPCH=$CCOREPCH -DWITH_COREDEBUG=$CDEBUG  -DCMAKE_BUILD_TYPE=$CTYPE -DWITH_WARNINGS=$CWARNINGS \
-  -DCMAKE_C_COMPILER=$CCOMPILERC -DCMAKE_CXX_COMPILER=$CCOMPILERCXX "-DDISABLED_AC_MODULES=$CDISABLED_AC_MODULES" $CCUSTOMOPTIONS
+  -DTOOLS=$CTOOLS \
+  -DUSE_SCRIPTPCH=$CSCRIPTPCH \
+  -DUSE_COREPCH=$CCOREPCH \
+  -DWITH_COREDEBUG=$CDEBUG  \
+  -DCMAKE_BUILD_TYPE=$CTYPE \
+  -DWITH_WARNINGS=$CWARNINGS \
+  -DCMAKE_C_COMPILER=$CCOMPILERC \
+  -DCMAKE_CXX_COMPILER=$CCOMPILERCXX \
+  "-DDISABLED_AC_MODULES=$CDISABLED_AC_MODULES" \
+  $CCUSTOMOPTIONS
 
   cd $CWD
 

conf/dist/config.sh

@@ -80,6 +80,8 @@ CTOOLS=${CTOOLS:-OFF}
 # use precompiled headers ( fatest compilation but not optimized if you change headers often )
 CSCRIPTPCH=${CSCRIPTPCH:-ON}
 CCOREPCH=${CCOREPCH:-ON}
+# compile with C++20
+CUSE_CPP_20=${CUSE_CPP_20:-OFF}
 
 # Skip specific modules from compilation (cmake reconfigure needed)
 # use semicolon ; to separate modules