Add cygwin regression tests

.github/workflows/ci.yml

@@ -725,3 +725,135 @@ jobs:
             cd boost-root
             b2 -j %NUMBER_OF_PROCESSORS% libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release embed-manifest-via=linker debug-symbols=off
 
+  cygwin:
+    defaults:
+      run:
+        shell: bash
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: gcc
+            cxxstd: "03,11,14,17"
+            cxxflags: -pipe
+            os: windows-latest
+
+    timeout-minutes: 240
+    runs-on: ${{matrix.os}}
+    container: ${{matrix.container}}
+
+    steps:
+      - name: Setup environment
+        uses: cygwin/cygwin-install-action@master
+        with:
+           packages: gcc-g++ make python3 git wget curl
+      - name: Setup Boost
+        shell: C:\cygwin\bin\bash.exe --login --norc -eo pipefail -o igncr '{0}'
+        run: |
+            echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
+            LIBRARY=${GITHUB_REPOSITORY#*/}
+            echo LIBRARY: $LIBRARY
+            echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
+            echo GITHUB_BASE_REF: $GITHUB_BASE_REF
+            echo GITHUB_REF: $GITHUB_REF
+            REF=${GITHUB_BASE_REF:-$GITHUB_REF}
+            REF=${REF#refs/heads/}
+            echo REF: $REF
+            BOOST_BRANCH=develop && [ "$REF" = "master" ] && BOOST_BRANCH=master || true
+            echo BOOST_BRANCH: $BOOST_BRANCH
+            BUILD_JOBS=$((nproc || sysctl -n hw.ncpu) 2> /dev/null)
+            echo BUILD_JOBS: $BUILD_JOBS
+            echo "BUILD_JOBS=$BUILD_JOBS" >> $GITHUB_ENV
+            echo "CMAKE_BUILD_PARALLEL_LEVEL=$BUILD_JOBS" >> $GITHUB_ENV
+            DEPINST_ARGS=()
+            GIT_VERSION="$(git --version | sed -e 's/git version //')"
+            GIT_HAS_JOBS=1
+            DEPINST_ARGS+=("--git_args" "--jobs $GIT_FETCH_JOBS")
+            mkdir -p snapshot
+            cd snapshot
+            echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+            curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+            tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+            if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
+            then
+                echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
+                ls -la
+                exit 1
+            fi
+            rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+            cd ..
+            git clone -b "$BOOST_BRANCH" --depth 1 "https://github.com/boostorg/boost.git" "boost-root"
+            cd boost-root
+            mkdir -p libs
+            rm -rf "libs/$LIBRARY"
+            mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
+            rm -rf "../snapshot"
+            git submodule update --init tools/boostdep
+            DEPINST_ARGS+=("$LIBRARY")
+            python tools/boostdep/depinst/depinst.py -C "${DEPINST_ARGS[@]}"
+            ./bootstrap.sh
+            ./b2 headers
+            if [ -n "${{matrix.compiler}}" -o -n "$GCC_TOOLCHAIN_ROOT" ]
+            then
+                echo -n "using ${{matrix.toolset}} : : ${{matrix.compiler}}" > ~/user-config.jam
+                if [ -n "$GCC_TOOLCHAIN_ROOT" ]
+                then
+                    echo -n " : <compileflags>\"--gcc-toolchain=$GCC_TOOLCHAIN_ROOT\" <linkflags>\"--gcc-toolchain=$GCC_TOOLCHAIN_ROOT\"" >> ~/user-config.jam
+                fi
+                echo " ;" >> ~/user-config.jam
+            fi
+
+      - name: Run tests
+        if: matrix.cmake_tests == ''
+        shell: C:\cygwin\bin\bash.exe --login --norc -eo pipefail -o igncr '{0}'
+        run: |
+            cd boost-root
+            ${{matrix.toolset}} --version
+            B2_ARGS=("-j" "$BUILD_JOBS" "toolset=${{matrix.toolset}}" "cxxstd=${{matrix.cxxstd}}" "debug-symbols=off")
+            #Build variant
+            if [ -n "${{matrix.build_variant}}" ]
+            then
+                B2_ARGS+=("variant=${{matrix.build_variant}}")
+            else
+                B2_ARGS+=("variant=$DEFAULT_BUILD_VARIANT")
+            fi
+            #Threading
+            if [ -n "${{matrix.threading}}" ]
+            then
+                B2_ARGS+=("threading=${{matrix.threading}}")
+            fi
+            #UBSAN options
+            if [ -n "${{matrix.ubsan}}" ]
+            then
+                export UBSAN_OPTIONS="verbosity=1:print_stacktrace=1"
+                B2_ARGS+=("undefined-sanitizer=norecover" "define=UBSAN=1")
+            fi
+            #ASAN options
+            if [ -n "${{matrix.asan}}" ]
+            then
+                export ASAN_OPTIONS="verbosity=1:print_stacktrace=1"
+                B2_ARGS+=("address-sanitizer=norecover" "define=ASAN=1")
+            fi
+            #Common UBSAN / ASAN options
+            if [ -n "${{matrix.asan}}" ] || [ -n "${{matrix.ubsan}}" ]
+            then
+                B2_ARGS+=("debug-symbols=on" "visibility=global")
+            fi
+            #cxxflags
+            if [ -n "${{matrix.cxxflags}}" ]
+            then
+                B2_ARGS+=("cxxflags=${{matrix.cxxflags}}")
+            fi
+            #address-model
+            if [ -n "${{matrix.address-model}}" ]
+            then
+                B2_ARGS+=("address-model=${{matrix.address-model}}")
+            fi
+            #link-flags
+            if [ -n "${{matrix.linkflags}}" ]
+            then
+                B2_ARGS+=("linkflags=${{matrix.linkflags}}")
+            fi
+            B2_ARGS+=("libs/$LIBRARY/test")
+            ./b2 "${B2_ARGS[@]}"