[slightly revise]

Author: kinke

.github/actions/1-setup/action.yml

@@ -1,4 +1,4 @@
-name: 1-setup
+name: Install prerequisites
 inputs:
   clang_version:
     required: true
@@ -9,6 +9,7 @@ inputs:
 runs:
   using: composite
   steps:
+
     - name: 'Linux: Install required apt packages'
       if: runner.os == 'Linux'
       shell: bash
@@ -32,6 +33,7 @@ runs:
         curl -fL --retry 3 --max-time 300 -o clang.tar.xz https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ inputs.clang_version }}/clang+llvm-${{ inputs.clang_version }}-x86_64-linux-gnu-ubuntu-18.04.tar.xz
         mkdir clang
         tar -xf clang.tar.xz --strip 1 -C clang
+        rm clang.tar.xz
         clang/bin/clang --version
     - name: 'Windows: Install clang'
       if: runner.os == 'Windows'
@@ -41,6 +43,7 @@ runs:
         cd ..
         curl -fL --retry 3 --max-time 300 -o clang.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ inputs.clang_version }}/LLVM-${{ inputs.clang_version }}-win64.exe
         ./clang.exe //S # double-slash for bash
+        rm clang.exe
         # C:\Program Files\LLVM\bin should already be in PATH
         clang-cl --version
 
@@ -71,6 +74,7 @@ runs:
           mkdir llvm
           cd llvm
           7z x ../llvm.7z >/dev/null
+          rm ../llvm.7z
           cd ..
         else
           if [[ '${{ runner.os }}' == Linux ]]; then
@@ -81,6 +85,7 @@ runs:
           curl -fL --retry 3 --max-time 300 -o llvm.tar.xz https://github.com/ldc-developers/llvm-project/releases/download/$tag/llvm-$version-$os-$arch$assertsSuffix.tar.xz
           mkdir llvm
           tar -xf llvm.tar.xz --strip 1 -C llvm
+          rm llvm.tar.xz
         fi
 
         llvm/bin/llvm-config --version
@@ -100,7 +105,7 @@ runs:
       uses: dlang-community/setup-dlang@v1.0.6
       with:
         compiler: ldc-latest
-    - name: 'Posix: Clear LD_LIBRARY_PATH env variable'
+    - name: 'Posix: Clear LD_LIBRARY_PATH env variable' # don't use host druntime/Phobos .so/.dylib etc.
       if: runner.os != 'Windows'
       shell: bash
       run: echo "LD_LIBRARY_PATH=" >> $GITHUB_ENV
@@ -117,7 +122,7 @@ runs:
     # the druntime tests require GNU make
     - name: 'Windows: Make sure GNU make is installed'
       if: runner.os == 'Windows'
-      shell: bash
+      shell: cmd
       run: make --version
 
     - name: 'Windows: Download & extract libcurl' # into ../libcurl/ldc2
@@ -130,6 +135,7 @@ runs:
         mkdir libcurl
         cd libcurl
         7z x ../libcurl.7z >/dev/null
+        rm ../libcurl.7z
         mkdir ldc2
         if [[ '${{ inputs.arch }}' == x64 ]]; then
           cp dmd2/windows/bin64/libcurl.dll ldc2/
@@ -140,7 +146,7 @@ runs:
         fi
         ls -lh ldc2/
 
-    - name: 'Windows: Set LDC_VSDIR env variable'
+    - name: 'Windows: Set LDC_VSDIR env variable' # to somewhat speed-up MSVC auto-detection
       if: runner.os == 'Windows'
       shell: bash
       run: echo "LDC_VSDIR=$(vswhere -latest -property installationPath)" >> $GITHUB_ENV

.github/actions/2-build-bootstrap/action.yml

@@ -1,4 +1,4 @@
-name: 2-build-bootstrap
+name: Build bootstrap LDC
 inputs:
   cmake_flags:
     required: false
@@ -8,17 +8,15 @@ inputs:
 runs:
   using: composite
   steps:
-    - shell: bash
-      run: |
-        cmake --version
-        ninja --version
 
     - name: 'Posix: Build bootstrap LDC'
       if: runner.os != 'Windows'
       shell: bash
       run: |
         set -eux
         cd ..
+        cmake --version
+        ninja --version
         mkdir bootstrap-ldc
         cd bootstrap-ldc
         cmake -G Ninja ../ldc \

.github/actions/3-build-cross/action.yml

@@ -1,4 +1,4 @@
-name: 3-build-cross
+name: Cross-compile LDC to ${{ inputs.os }}-${{ inputs.arch }}
 inputs:
   arch:
     required: true
@@ -19,7 +19,7 @@ runs:
   using: composite
   steps:
 
-    - name: Download & extract LDC-flavoured LLVM for ${{ inputs.os }}/${{ inputs.arch }} target # into ../llvm-cross
+    - name: Download & extract LDC-flavoured LLVM for ${{ inputs.os }}-${{ inputs.arch }} target # into ../llvm-cross
       shell: bash
       run: |
         set -eux
@@ -56,6 +56,7 @@ runs:
           cp llvm/bin/llvm-config llvm-cross/bin/
         fi
 
+    # set up DFLAGS to make bootstrap ldmd2 cross-compile/link
     - name: 'macOS: Set DFLAGS, CROSS_TRIPLE & CROSS_CMAKE_FLAGS'
       if: inputs.os == 'osx'
       shell: bash
@@ -68,7 +69,7 @@ runs:
         echo "CROSS_TRIPLE=$triple" >> $GITHUB_ENV
         echo "CROSS_CMAKE_FLAGS=-DCMAKE_OSX_ARCHITECTURES=$arch" >> $GITHUB_ENV
 
-    - name: 'Android: Download & extract NDK; set DFLAGS, CROSS_TRIPLE & CROSS_CMAKE_FLAGS'
+    - name: 'Android: Download & extract NDK, then set DFLAGS, CROSS_TRIPLE & CROSS_CMAKE_FLAGS'
       if: inputs.os == 'android'
       shell: bash
       run: |

.github/actions/3-build-native/action.yml

@@ -1,4 +1,4 @@
-name: 3-build-native
+name: Build LDC & LDC D unittests & defaultlib unittest runners
 inputs:
   cmake_flags:
     required: false
@@ -8,6 +8,7 @@ inputs:
 runs:
   using: composite
   steps:
+
     - name: 'Posix: Build LDC & LDC D unittests & defaultlib unittest runners'
       if: runner.os != 'Windows'
       shell: bash

.github/actions/4a-test-ldc2/action.yml

@@ -1,7 +1,6 @@
-name: 4a-test-ldc2
+name: Run LDC D unittests
 runs:
   using: composite
   steps:
-    - name: Run LDC D unittests
+    - run: cd ../build && ctest --output-on-failure -R "ldc2-unittest"
       shell: bash
-      run: cd ../build && ctest --output-on-failure -R "ldc2-unittest"

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

@@ -1,10 +1,11 @@
-name: 4b-test-lit
+name: Run LIT testsuite
 inputs:
   arch:
     required: false # Windows only
 runs:
   using: composite
   steps:
+
     - name: 'Posix: Run LIT testsuite'
       if: runner.os != 'Windows'
       shell: bash

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

@@ -1,10 +1,11 @@
-name: 4c-test-dmd
+name: Run DMD testsuite
 inputs:
   arch:
     required: false # Windows only
 runs:
   using: composite
   steps:
+
     - name: 'Posix: Run DMD testsuite'
       if: runner.os != 'Windows'
       shell: bash

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

@@ -1,10 +1,11 @@
-name: 4d-test-libs
+name: Run defaultlib unittests & druntime integration tests
 inputs:
   arch:
     required: false # Windows only
 runs:
   using: composite
   steps:
+
     - name: 'Posix: Run defaultlib unittests & druntime integration tests'
       if: runner.os != 'Windows'
       shell: bash

.github/actions/5-install/action.yml

@@ -1,4 +1,4 @@
-name: 5-install
+name: Install LDC & make portable
 inputs:
   arch:
     required: false # Windows only
@@ -8,11 +8,13 @@ inputs:
 runs:
   using: composite
   steps:
+
     - name: Install LDC
       shell: bash
       run: |
         set -eux
         cd ..
+
         if [[ '${{ inputs.cross_compiling }}' != true ]]; then
           cd build
           ninja install >/dev/null
@@ -32,6 +34,7 @@ runs:
           rm -rf install/import/etc/c/zlib
           cp -R ldc/runtime/phobos/std install/import/
         fi
+
         cp ldc/LICENSE install/
         if [[ '${{ runner.os }}' == Windows ]]; then
           cp ldc/packaging/README.txt install/
@@ -70,6 +73,8 @@ runs:
         mkdir mingw-w64-libs
         cd mingw-w64-libs
         7z x ../mingw-w64-libs.7z >/dev/null
+        rm ../mingw-w64-libs.7z
+
         if [[ '${{ inputs.arch }}' == x86 ]]; then
           model=32
         else

.github/actions/5a-android-x86/action.yml

@@ -1,12 +1,11 @@
-name: 5a-android-x86
+name: 'Android: Cross-compile ${{ inputs.arch }} libraries & copy to install dir'
 inputs:
   arch:
     required: true
 runs:
   using: composite
   steps:
-    - name: Cross-compile ${{ inputs.arch }} libraries & copy to install dir
-      shell: bash
+    - shell: bash
       run: |
         set -eux
         cd ..

.github/actions/5a-ios/action.yml

@@ -1,4 +1,4 @@
-name: 5a-ios
+name: 'macOS: Cross-compile iOS libraries, copy to install dir & extend ldc2.conf'
 inputs:
   arch:
     required: true
@@ -8,8 +8,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - name: Cross-compile iOS libraries, copy to install dir & extend ldc2.conf
-      shell: bash
+    - shell: bash
       run: |
         set -eux
         cd ..

.github/actions/6-integration-test/action.yml

@@ -1,7 +1,8 @@
-name: 6-integration-test
+name: Run a few integration tests against the installed compiler
 runs:
   using: composite
   steps:
+
     - name: Generate hello.d
       shell: bash
       run: echo 'void main() { import std.stdio; writefln("Hello world, %d bits", size_t.sizeof * 8); }' > ../hello.d

.github/actions/7-package/action.yml

@@ -1,4 +1,4 @@
-name: 7-package
+name: Create package & upload artifact(s)
 inputs:
   arch:
     required: true
@@ -11,6 +11,7 @@ inputs:
 runs:
   using: composite
   steps:
+
     - name: Set DMD environment variable
       shell: bash
       run: |

.github/actions/merge-macos/action.yml

@@ -1,4 +1,4 @@
-name: merge-macos
+name: Merge x86_64 & arm64 packages to universal one
 runs:
   using: composite
   steps:

.github/actions/merge-windows/action.yml

@@ -1,4 +1,4 @@
-name: merge-windows
+name: Merge x64 & x86 packages to multilib one & build installer
 runs:
   using: composite
   steps:
@@ -100,7 +100,7 @@ runs:
           "/DLDCDir=%CD%\%ARTIFACT_NAME%" ^
           packaging\windows_installer.iss
 
-    - name: Upload multilib package and installer
+    - name: Upload multilib package & installer
       uses: actions/upload-artifact@v3
       with:
         name: windows-multilib

.github/actions/upload-to-github/action.yml

@@ -1,4 +1,4 @@
-name: merge-windows
+name: Upload to GitHub
 runs:
   using: composite
   steps: