package/ci: initial CircleCI setup with a desktop Linux build.

Author: mosra

.circleci/config.yml

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+../package/ci/circleci.yml

package/ci/circleci.yml

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+version: 2.1
+
+orbs:
+  codecov: codecov/[email protected]
+
+executors:
+  ubuntu-16_04:
+    docker:
+    - image: ubuntu:xenial-20201014
+
+commands:
+  install-base:
+    steps:
+    - run:
+        name: Update apt and install base tools
+        # - Curl needed by codecov, wget by us
+        # - git soft-required by the `checkout` step, but needed by us to
+        #   generate version info
+        command: |
+          apt update
+          apt install -y ninja-build lcov wget curl git
+
+  install-gcc-4_8:
+    steps:
+    - run:
+        name: Install GCC 4.8
+        command: |
+          apt install -y g++-4.8
+          echo 'export CXX=g++-4.8' >> $BASH_ENV
+
+  install-cmake-3_4:
+    steps:
+    - run:
+        name: Install CMake 3.4
+        command: |
+          mkdir -p $HOME/cmake && cd $HOME/cmake
+          wget -nc --no-check-certificate https://cmake.org/files/v3.4/cmake-3.4.3-Linux-x86_64.tar.gz
+          tar --strip-components=1 -xzf cmake-3.4.3-Linux-x86_64.tar.gz
+          echo 'export PATH=$HOME/cmake/bin:$PATH' >> $BASH_ENV
+          source $BASH_ENV && cmake --version | grep 3.4
+
+  make-expected-linux-dirs:
+    steps:
+    - run:
+        name: Create files expected by Utility::Directory tests on Linux
+        command: |
+          mkdir -p ~/.config/autostart
+          mkdir -p ~/.local
+
+  build:
+    parameters:
+      script:
+        type: string
+    steps:
+    - checkout
+    - run:
+        name: Build & test
+        command: |
+          if [ "$BUILD_STATIC" != "ON" ]; then export BUILD_STATIC=OFF; fi
+          if [ "$BUILD_DEPRECATED" != "OFF" ]; then export BUILD_DEPRECATED=ON; fi
+          ./package/ci/<< parameters.script >>
+
+  lcov:
+    steps:
+    - run:
+        name: Collect code coverage
+        command: |
+          lcov $LCOV_EXTRA_OPTS --directory . --capture --output-file coverage.info > /dev/null
+          lcov $LCOV_EXTRA_OPTS --extract coverage.info "*/src/Corrade/*" --output-file coverage.info > /dev/null
+          lcov $LCOV_EXTRA_OPTS --remove coverage.info "*/Test/*" --output-file coverage.info > /dev/null
+          lcov $LCOV_EXTRA_OPTS --remove coverage.info "*/build/src/Corrade/*" --output-file coverage.info > /dev/null
+    - codecov/upload:
+        file: coverage.info
+
+jobs:
+  linux:
+    executor: ubuntu-16_04
+    environment:
+      CMAKE_CXX_FLAGS: --coverage
+      LCOV_EXTRA_OPTS: --gcov-tool /usr/bin/gcov-4.8
+      CONFIGURATION: Debug
+    steps:
+    - install-base
+    - install-gcc-4_8
+    - install-cmake-3_4
+    - make-expected-linux-dirs
+    - build:
+        script: travis-desktop.sh
+    - lcov
+
+workflows:
+  version: 2
+  build:
+    jobs:
+    - linux