Switch to C++20

glibc compatibility remains the same, except for the Aarch64 build which
now requires glibc 2.35+ (Ubuntu 22.04 Jammy, Debian 12 Bookworm)

.github/workflows/Linux_aarch64.yml

@@ -22,26 +22,22 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
     - name: Checkout
       uses: actions/checkout@v3
       with:
         fetch-depth: 0
 
     - name: Create Build Environment
-      run: |
-        # Work around the somewhat broken packages in the GitHub Actions Ubuntu 20.04 image.
-        # https://github.com/actions/runner-images/issues/4620#issuecomment-981333260
-        sudo apt-get -y install --allow-downgrades libpcre2-8-0=10.34-7
-        Packaging/nix/debian-cross-aarch64-prep.sh
+      run: Packaging/nix/debian-cross-aarch64-prep.sh
 
     - name: Cache CMake build folder
       uses: actions/cache@v3
       with:
         path: build
-        key: ${{ github.workflow }}-v2-${{ github.sha }}
-        restore-keys: ${{ github.workflow }}-v2-
+        key: ${{ github.workflow }}-v5-${{ github.sha }}
+        restore-keys: ${{ github.workflow }}-v5-
 
     - name: Build
       working-directory: ${{github.workspace}}

.github/workflows/Linux_x86.yml

@@ -29,19 +29,26 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Install GCC
+      run: |
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+        sudo apt-get update
+        sudo apt-get install -yq --no-install-recommends gcc-13 g++-13 g++-13-multilib
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 13 --slave /usr/bin/g++ g++ /usr/bin/g++-13
+
     - name: Create Build Environment
       run: |
         # Work around the somewhat broken packages in the GitHub Actions Ubuntu 20.04 image.
         # https://github.com/actions/runner-images/issues/4620#issuecomment-981333260
         sudo apt-get -y install --allow-downgrades libpcre2-8-0=10.34-7
-        Packaging/nix/debian-cross-i386-prep.sh
+        Packaging/nix/debian-cross-i386-prep.sh --no-gcc
 
     - name: Cache CMake build folder
       uses: actions/cache@v3
       with:
         path: build
-        key: ${{ github.workflow }}-v3-${{ github.sha }}
-        restore-keys: ${{ github.workflow }}-v3-
+        key: ${{ github.workflow }}-v5-${{ github.sha }}
+        restore-keys: ${{ github.workflow }}-v5-
 
     - name: Build
       working-directory: ${{github.workspace}}

.github/workflows/Linux_x86_64.yml

@@ -29,15 +29,22 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Install GCC
+      run: |
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+        sudo apt-get update
+        sudo apt-get install -yq --no-install-recommends gcc-13 g++-13
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 13 --slave /usr/bin/g++ g++ /usr/bin/g++-13
+
     - name: Create Build Environment
-      run: Packaging/nix/debian-host-prep.sh
+      run: Packaging/nix/debian-host-prep.sh --no-gcc
 
     - name: Cache CMake build folder
       uses: actions/cache@v3
       with:
         path: build
-        key: ${{ github.workflow }}-v2-${{ github.sha }}
-        restore-keys: ${{ github.workflow }}-v2-
+        key: ${{ github.workflow }}-v4-${{ github.sha }}
+        restore-keys: ${{ github.workflow }}-v4-
 
     - name: Build
       working-directory: ${{github.workspace}}

.github/workflows/Linux_x86_64_test.yml

@@ -18,7 +18,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v3

CMakeLists.txt

@@ -293,12 +293,9 @@ if(GPERF)
   endif()
 endif()
 
-# Despite setting C++ standard to 20, features from this version are not being used.
-# DevilutionX is compatible with C++ 17.
-# Here we set it to 20 only to take advantage of the fmt::format build time errors.
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_EXTENSIONS OFF)
-set(CMAKE_CXX_STANDARD_REQUIRED OFF)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON) # for clang-tidy
 set(CMAKE_THREAD_PREFER_PTHREAD ON)
 set(THREADS_PREFER_PTHREAD_FLAG ON)

Packaging/nix/debian-cross-aarch64-prep.sh

@@ -18,8 +18,18 @@ LIST
 	cat /etc/apt/sources.list
 fi
 
+
+PACKAGES=(
+  cmake git smpq gettext
+  libsdl2-dev:arm64 libsdl2-image-dev:arm64 libsodium-dev:arm64
+  libsimpleini-dev:arm64 libpng-dev:arm64 libbz2-dev:arm64 libfmt-dev:arm64
+)
+
+if (( $# < 1 )) || [[ "$1" != --no-gcc ]]; then
+  PACKAGES+=(crossbuild-essential-arm64)
+fi
+
+
 sudo dpkg --add-architecture arm64
 sudo apt-get update
-sudo apt-get install -y cmake git smpq gettext crossbuild-essential-arm64 \
-  libsdl2-dev:arm64 libsdl2-image-dev:arm64 libsodium-dev:arm64 \
-  libsimpleini-dev:arm64 libpng-dev:arm64 libbz2-dev:arm64 libfmt-dev:arm64
+sudo apt-get install -y "${PACKAGES[@]}"

Packaging/nix/debian-cross-i386-prep.sh

@@ -2,9 +2,17 @@
 set -euo pipefail
 set -x
 
+PACKAGES=(
+  cmake git smpq gettext
+  libsdl2-dev:i386 libsdl2-image-dev:i386 libsodium-dev:i386
+  libpng-dev:i386 libbz2-dev:i386 libfmt-dev:i386
+)
+
+if (( $# < 1 )) || [[ "$1" != --no-gcc ]]; then
+  PACKAGES+=(g++-multilib)
+fi
+
 sudo dpkg --add-architecture i386
 sudo apt-get update
-sudo apt-get install --ignore-hold -y \
-  cmake g++-multilib git smpq gettext \
-  libsdl2-dev:i386 libsdl2-image-dev:i386 libsodium-dev:i386 \
-  libpng-dev:i386 libbz2-dev:i386 libfmt-dev:i386
+sudo apt-get install --ignore-hold -y "${PACKAGES[@]}"
+

Packaging/nix/debian-host-prep.sh

@@ -2,7 +2,15 @@
 set -euo pipefail
 set -x
 
-sudo apt-get update
-sudo apt-get install -y \
-  rpm pkg-config cmake g++ git smpq gettext libsdl2-dev libsdl2-image-dev libsodium-dev \
+PACKAGES=(
+  rpm pkg-config cmake git smpq gettext libsdl2-dev libsdl2-image-dev libsodium-dev
   libpng-dev libbz2-dev libfmt-dev
+)
+
+if (( $# < 1 )) || [[ "$1" != --no-gcc ]]; then
+  PACKAGES+=(g++)
+fi
+
+sudo apt-get update
+sudo apt-get install -y "${PACKAGES[@]}"
+

Source/towners.cpp

@@ -77,8 +77,7 @@ void InitSmith(Towner &towner, const TownerData &townerData)
 		0, 0, 0, 0, 0, 0,  0,  0,  0,  0,  0,  0,  0,  0, 0, 1, 2, 3
 		// clang-format on
 	};
-	towner.animOrder = AnimOrder;
-	towner.animOrderSize = sizeof(AnimOrder);
+	towner.animOrder = { AnimOrder };
 	LoadTownerAnimations(towner, "towners\\smith\\smithn", 16, 3);
 	towner.name = _("Griswold the Blacksmith");
 	towner.gossip = PickRandomlyAmong({ TEXT_GRISWOLD2, TEXT_GRISWOLD3, TEXT_GRISWOLD4, TEXT_GRISWOLD5, TEXT_GRISWOLD6, TEXT_GRISWOLD7, TEXT_GRISWOLD8, TEXT_GRISWOLD9, TEXT_GRISWOLD10, TEXT_GRISWOLD12, TEXT_GRISWOLD13 });
@@ -100,8 +99,7 @@ void InitBarOwner(Towner &towner, const TownerData &townerData)
 		0, 1, 2, 3, 4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15
 		// clang-format on
 	};
-	towner.animOrder = AnimOrder;
-	towner.animOrderSize = sizeof(AnimOrder);
+	towner.animOrder = { AnimOrder };
 	LoadTownerAnimations(towner, "towners\\twnf\\twnfn", 16, 3);
 	towner.name = _("Ogden the Tavern owner");
 	towner.gossip = PickRandomlyAmong({ TEXT_OGDEN2, TEXT_OGDEN3, TEXT_OGDEN4, TEXT_OGDEN5, TEXT_OGDEN6, TEXT_OGDEN8, TEXT_OGDEN9, TEXT_OGDEN10 });
@@ -110,8 +108,7 @@ void InitBarOwner(Towner &towner, const TownerData &townerData)
 void InitTownDead(Towner &towner, const TownerData &townerData)
 {
 	towner._tAnimWidth = 96;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 	LoadTownerAnimations(towner, "towners\\butch\\deadguy", 8, 6);
 	towner.name = _("Wounded Townsman");
 }
@@ -132,8 +129,7 @@ void InitWitch(Towner &towner, const TownerData &townerData)
 		 0,  1,  0, 18, 17, 18,  0,  1,  0,  1,  2
 		// clang-format on
 	};
-	towner.animOrder = AnimOrder;
-	towner.animOrderSize = sizeof(AnimOrder);
+	towner.animOrder = { AnimOrder };
 	LoadTownerAnimations(towner, "towners\\townwmn1\\witch", 19, 6);
 	towner.name = _("Adria the Witch");
 	towner.gossip = PickRandomlyAmong({ TEXT_ADRIA2, TEXT_ADRIA3, TEXT_ADRIA4, TEXT_ADRIA5, TEXT_ADRIA6, TEXT_ADRIA7, TEXT_ADRIA8, TEXT_ADRIA9, TEXT_ADRIA10, TEXT_ADRIA12, TEXT_ADRIA13 });
@@ -142,8 +138,7 @@ void InitWitch(Towner &towner, const TownerData &townerData)
 void InitBarmaid(Towner &towner, const TownerData &townerData)
 {
 	towner._tAnimWidth = 96;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 	LoadTownerAnimations(towner, "towners\\townwmn1\\wmnn", 18, 6);
 	towner.name = _("Gillian the Barmaid");
 	towner.gossip = PickRandomlyAmong({ TEXT_GILLIAN2, TEXT_GILLIAN3, TEXT_GILLIAN4, TEXT_GILLIAN5, TEXT_GILLIAN6, TEXT_GILLIAN7, TEXT_GILLIAN9, TEXT_GILLIAN10 });
@@ -152,8 +147,7 @@ void InitBarmaid(Towner &towner, const TownerData &townerData)
 void InitBoy(Towner &towner, const TownerData &townerData)
 {
 	towner._tAnimWidth = 96;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 	LoadTownerAnimations(towner, "towners\\townboy\\pegkid1", 20, 6);
 	towner.name = _("Wirt the Peg-legged boy");
 	towner.gossip = PickRandomlyAmong({ TEXT_WIRT2, TEXT_WIRT3, TEXT_WIRT4, TEXT_WIRT5, TEXT_WIRT6, TEXT_WIRT7, TEXT_WIRT8, TEXT_WIRT9, TEXT_WIRT11, TEXT_WIRT12 });
@@ -175,8 +169,7 @@ void InitHealer(Towner &towner, const TownerData &townerData)
 		 4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
 		// clang-format on
 	};
-	towner.animOrder = AnimOrder;
-	towner.animOrderSize = sizeof(AnimOrder);
+	towner.animOrder = { AnimOrder };
 	LoadTownerAnimations(towner, "towners\\healer\\healer", 20, 6);
 	towner.name = _("Pepin the Healer");
 	towner.gossip = PickRandomlyAmong({ TEXT_PEPIN2, TEXT_PEPIN3, TEXT_PEPIN4, TEXT_PEPIN5, TEXT_PEPIN6, TEXT_PEPIN7, TEXT_PEPIN9, TEXT_PEPIN10, TEXT_PEPIN11 });
@@ -193,8 +186,7 @@ void InitTeller(Towner &towner, const TownerData &townerData)
 		13, 12, 11, 10,  9,  8,  7,  6,  5,  4,  3,  2,  1,  0
 		// clang-format on
 	};
-	towner.animOrder = AnimOrder;
-	towner.animOrderSize = sizeof(AnimOrder);
+	towner.animOrder = { AnimOrder };
 	LoadTownerAnimations(towner, "towners\\strytell\\strytell", 25, 3);
 	towner.name = _("Cain the Elder");
 	towner.gossip = PickRandomlyAmong({ TEXT_STORY2, TEXT_STORY3, TEXT_STORY4, TEXT_STORY5, TEXT_STORY6, TEXT_STORY7, TEXT_STORY9, TEXT_STORY10, TEXT_STORY11 });
@@ -210,8 +202,7 @@ void InitDrunk(Towner &towner, const TownerData &townerData)
 		 0, 1, 2,  3,  4,  4,  4,  3,  2,  1
 		// clang-format on
 	};
-	towner.animOrder = AnimOrder;
-	towner.animOrderSize = sizeof(AnimOrder);
+	towner.animOrder = { AnimOrder };
 	LoadTownerAnimations(towner, "towners\\drunk\\twndrunk", 18, 3);
 	towner.name = _("Farnham the Drunk");
 	towner.gossip = PickRandomlyAmong({ TEXT_FARNHAM2, TEXT_FARNHAM3, TEXT_FARNHAM4, TEXT_FARNHAM5, TEXT_FARNHAM6, TEXT_FARNHAM8, TEXT_FARNHAM9, TEXT_FARNHAM10, TEXT_FARNHAM11, TEXT_FARNHAM12, TEXT_FARNHAM13 });
@@ -220,8 +211,7 @@ void InitDrunk(Towner &towner, const TownerData &townerData)
 void InitCows(Towner &towner, const TownerData &townerData)
 {
 	towner._tAnimWidth = 128;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 
 	NewTownerAnim(towner, (*CowSprites)[static_cast<size_t>(townerData.dir)], 12, 3);
 	towner._tAnimFrame = GenerateRnd(11);
@@ -246,8 +236,7 @@ void InitCows(Towner &towner, const TownerData &townerData)
 void InitFarmer(Towner &towner, const TownerData &townerData)
 {
 	towner._tAnimWidth = 96;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 	LoadTownerAnimations(towner, "towners\\farmer\\farmrn2", 15, 3);
 	towner.name = _("Lester the farmer");
 }
@@ -259,17 +248,15 @@ void InitCowFarmer(Towner &towner, const TownerData &townerData)
 		celPath = "towners\\farmer\\mfrmrn2";
 	}
 	towner._tAnimWidth = 96;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 	LoadTownerAnimations(towner, celPath, 15, 3);
 	towner.name = _("Complete Nut");
 }
 
 void InitGirl(Towner &towner, const TownerData &townerData)
 {
 	towner._tAnimWidth = 96;
-	towner.animOrder = nullptr;
-	towner.animOrderSize = 0;
+	towner.animOrder = {};
 	LoadTownerAnimations(towner, "towners\\girl\\girlw1", 20, 6);
 	towner.name = _("Celia");
 }
@@ -887,9 +874,9 @@ void ProcessTowners()
 
 		towner._tAnimCnt = 0;
 
-		if (towner.animOrderSize > 0) {
+		if (!towner.animOrder.empty()) {
 			towner._tAnimFrameCnt++;
-			if (towner._tAnimFrameCnt > towner.animOrderSize - 1)
+			if (towner._tAnimFrameCnt > towner.animOrder.size() - 1)
 				towner._tAnimFrameCnt = 0;
 
 			towner._tAnimFrame = towner.animOrder[towner._tAnimFrameCnt];

Source/towners.h

@@ -8,6 +8,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <memory>
+#include <span>
 #include <string_view>
 
 #include "items.h"
@@ -39,7 +40,7 @@ struct Towner {
 	OptionalOwnedClxSpriteList ownedAnim;
 	OptionalClxSpriteList anim;
 	/** Specifies the animation frame sequence. */
-	const uint8_t *animOrder; // unowned
+	std::span<const uint8_t> animOrder;
 	void (*talk)(Player &player, Towner &towner);
 
 	std::string_view name;
@@ -58,7 +59,6 @@ struct Towner {
 	/** Current frame of animation. */
 	uint8_t _tAnimFrame;
 	uint8_t _tAnimFrameCnt;
-	uint8_t animOrderSize;
 	_talker_id _ttype;
 
 	[[nodiscard]] ClxSprite currentSprite() const