CI: Add Alpine aarch64 job/package

.github/actions/4b-test-lit/action.yml

@@ -16,6 +16,10 @@ runs:
           # FIXME: the following tests fail
           rm tests/debuginfo/nested_gdb.d
           rm tests/sanitizers/fuzz_basic.d
+          if type -P apk &>/dev/null; then
+            # FIXME: empty exception backtrace on musl AArch64
+            rm tests/codegen/exception_stack_trace.d
+          fi
         fi
 
         cd ../build

.github/actions/4c-test-dmd/action.yml

@@ -1,15 +1,25 @@
 name: Run DMD testsuite
 inputs:
   arch:
-    required: false # Windows only
+    required: true
 runs:
   using: composite
   steps:
 
     - name: 'Posix: Run DMD testsuite'
       if: runner.os != 'Windows'
       shell: bash
-      run: cd ../build && ctest -V -R "dmd-testsuite"
+      run: |
+        set -eux
+
+        if [[ '${{ inputs.arch }}' == aarch64 ]] && type -P apk &>/dev/null; then
+          # FIXME: empty exception backtraces on musl AArch64 with enabled optimizations
+          rm tests/dmd/runnable/test19086.d
+          rm tests/dmd/runnable/test17559.d
+        fi
+
+        cd ../build
+        ctest -V -R "dmd-testsuite"
 
     - name: 'Windows: Run DMD testsuite'
       if: runner.os == 'Windows'

.github/actions/4d-test-libs/action.yml

@@ -25,6 +25,10 @@ runs:
         elif [[ '${{ runner.os }}-${{ inputs.arch }}' == Linux-aarch64 ]]; then
           # FIXME: sporadically hanging
           excludes+='|^core.thread-shared$'
+          if type -P apk &>/dev/null; then
+            # FIXME: empty exception backtraces on musl AArch64 with enabled optimizations
+            excludes+='|^druntime-test-exceptions-release$'
+          fi
         fi
         if [[ '${{ runner.os }}' == macOS ]]; then
           # FIXME: https://github.com/dlang/phobos/issues/10730

.github/workflows/main.yml

@@ -70,6 +70,26 @@ jobs:
               -DEXTRA_CXXFLAGS=-flto=full
             with_pgo: true
 
+          - job_name: Alpine musl aarch64
+            os: ubuntu-24.04-arm
+            container_image: alpine:3.21
+            arch: aarch64
+            base_cmake_flags: >-
+              -DLDC_INSTALL_LLVM_RUNTIME_LIBS_ARCH=aarch64
+              -DLLVM_IS_SHARED=OFF
+              -DLDC_ENABLE_PLUGINS=OFF
+              -DLDC_DYNAMIC_COMPILE=OFF
+            extra_cmake_flags: >-
+              -DTEST_COMPILER_RT_LIBRARIES="profile;lsan;asan;msan;fuzzer"
+              -DLDC_INSTALL_LTOPLUGIN=OFF
+              -DLDC_FULLY_STATIC=ON
+              -DCMAKE_C_COMPILER=clang
+              -DCMAKE_CXX_COMPILER=clang++
+              -DCMAKE_EXE_LINKER_FLAGS=-static-libstdc++
+              -DD_COMPILER_FLAGS="-O -flto=full -defaultlib=phobos2-ldc-lto,druntime-ldc-lto"
+              -DEXTRA_CXXFLAGS=-flto=full
+            with_pgo: true
+
           - job_name: macOS x86_64
             os: macos-15-intel
             arch: x86_64
@@ -116,7 +136,11 @@ jobs:
 
     name: ${{ matrix.job_name }}
     runs-on: ${{ matrix.os }}
-    container: ${{ matrix.container_image }}
+    container:
+      image: ${{ matrix.container_image }}
+      volumes: # needed for Alpine aarch64 job: https://github.com/actions/runner/issues/801#issuecomment-2976165281
+        - /opt:/opt:rw,rshared
+        - /opt:/__e/node20:ro,rshared
     timeout-minutes: 90
     env:
       MACOSX_DEPLOYMENT_TARGET: ${{ matrix.arch == 'arm64' && '11.0' || '10.12' }}
@@ -138,10 +162,18 @@ jobs:
             # create missing 7za symlink
             ln -s 7z /usr/bin/7za
             # make lld the default linker (note: /usr/bin/ld seems unused)
-            ln -sf /usr/bin/ld.lld /usr/x86_64-alpine-linux-musl/bin/ld
+            ln -sf /usr/bin/ld.lld /usr/${{ matrix.arch }}-alpine-linux-musl/bin/ld
             # create ../llvm symlink to distro LLVM (no prebuilt LDC-LLVM for musl)
             ln -s /usr/lib/llvm19 $(dirname $(pwd))/llvm
             ../llvm/bin/llvm-config --version
+
+            # see https://github.com/actions/runner/issues/801#issuecomment-2976165281
+            if [[ '${{ matrix.arch }}' == aarch64 ]]; then
+              sed -i "/^ID=/s/alpine/NotpineForGHA/" /etc/os-release
+              apk add nodejs --update-cache
+              mkdir /opt/bin
+              ln -s /usr/bin/node /opt/bin/node
+            fi
           fi
       - uses: actions/checkout@v4
         with:

CHANGELOG.md

@@ -3,6 +3,7 @@
 #### Big news
 - Frontend, druntime and Phobos are at version ~[2.112.0](https://dlang.org/changelog/2.112.0.html), incl. new command-line options `-extI`, `-dllimport=externalOnly` and `-edition`. (#4949, #4962, #4988, #5029)
 - Support for [LLVM 21](https://releases.llvm.org/21.1.0/docs/ReleaseNotes.html). Beware that patch versions before v21.1.8 seem to misoptimize `std.json`. (#4950, #5033)
+- New prebuilt package for Alpine Linux aarch64 with musl libc, analogous to the existing x86_64 package. (#4943)
 - **Breaking change for dcompute**: The special `@kernel` UDA is now a function and _**requires**_ parentheses as in `@kernel() void foo(){}`. Optionally you can provide launch dimensions, `@kernel([2,4,8])`, to specify to the compute runtime how the kernel is intended to be launched.
 - ldc2.conf can now be a directory. All the files inside it, ordered naturally, will be concatenated and treated like a big config. (#4954)
   - Running `ldc-build-runtime --installWithSuffix` now includes installing a target-specific .conf file to that directory. (#4978)

runtime/druntime/src/rt/dwarfeh.d

@@ -564,7 +564,7 @@ extern (C) _Unwind_Reason_Code _d_eh_personality_common(_Unwind_Action actions,
         {
             auto eh = ExceptionHeader.toExceptionHeader(exceptionObject);
             for (auto ehx = eh; ehx; ehx = ehx.next)
-                writeln(" eh: %p next=%014p lsda=%p '%.*s'", ehx, ehx.next, ehx.languageSpecificData, ehx.object.msg.length, ehx.object.msg.ptr);
+                writeln(" eh: %p next=%014p lsda=%p '%.*s'", ehx, ehx.next, ehx.languageSpecificData, cast(int) ehx.object.msg.length, ehx.object.msg.ptr);
         }
     }
 
@@ -657,7 +657,7 @@ extern (C) _Unwind_Reason_Code _d_eh_personality_common(_Unwind_Action actions,
     if (exceptionClass == dmdExceptionClass)
     {
         auto eh = ExceptionHeader.toExceptionHeader(exceptionObject);
-        debug (EH_personality) writeln(" '%.*s' next = %p", eh.object.msg.length, eh.object.msg.ptr, eh.next);
+        debug (EH_personality) writeln(" '%.*s' next = %p", cast(int) eh.object.msg.length, eh.object.msg.ptr, eh.next);
         auto currentLsd = language_specific_data;
         bool bypassed = false;
         while (eh.next)

tests/codegen/exception_stack_trace.d

@@ -21,7 +21,7 @@ void main()
     {
         import core.stdc.stdio;
         auto s = e.toString();
-        printf("%.*s\n", s.length, s.ptr);
+        printf("%.*s\n", cast(int) s.length, s.ptr);
     }
 }