Use GCC14 on arm64 runner and enable SVE (#545)

Author: solidpixel

.github/workflows/build_test.yaml

@@ -81,20 +81,25 @@ jobs:
       - name: Install ImageMagick
         run: sudo apt install imagemagick
 
+      - name: Install GCC 14
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-14
+
       - name: Build release
         run: |
-          export CXX=g++
+          export CXX=g++-14
           mkdir build_rel
           cd build_rel
-          cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../ -DASTCENC_UNITTEST=ON -DASTCENC_ISA_NEON=ON -DASTCENC_ISA_NONE=ON -DASTCENC_PACKAGE=arm64 ..
-          make install package -j4
+          cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../ -DASTCENC_UNITTEST=ON -DASTCENC_ISA_NEON=ON -DASTCENC_ISA_SVE_128=ON -DASTCENC_ISA_NONE=ON ..
+          make install -j4
 
       - name: Build debug
         run: |
-          export CXX=clang++
+          export CXX=g++-14
           mkdir build_dbg
           cd build_dbg
-          cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DASTCENC_ISA_NEON=ON -DASTCENC_ISA_NONE=ON ..
+          cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DASTCENC_ISA_NEON=ON DASTCENC_ISA_SVE_128=ON -DASTCENC_ISA_NONE=ON ..
           make -j4
 
       - name: Setup Python
@@ -108,14 +113,18 @@ jobs:
           pip install numpy Pillow
 
       - name: Run system tests
+        # GitHub is using Cobalt-100, which has 128-bit SVE so we cannot test sve_256 here
         run: |
           python ./Test/astc_test_functional.py --encoder none
           python ./Test/astc_test_functional.py --encoder neon
+          python ./Test/astc_test_functional.py --encoder sve_128
           python ./Test/astc_test_image.py --encoder none --test-set Small
           python ./Test/astc_test_image.py --encoder neon --test-set Small
+          python ./Test/astc_test_image.py --encoder sve_128 --test-set Small
 
       - name: Run unit tests
-        run: ctest --rerun-failed --output-on-failure
+        # GitHub is using Cobalt-100, which has 128-bit SVE so we cannot test sve_256 here
+        run: ctest -E test-unit-sve_256 --rerun-failed --output-on-failure
         working-directory: build_rel
 
   build-ubuntu-x64-clang: