CI: Add tests with GCC 9 & 10, clang 10.

.drone.yml

@@ -13,6 +13,41 @@ trigger:
     - tag
 
 steps:
+- name: GCC 9 & 10 / clang 10
+  image: ubuntu:focal
+  pull: always
+  environment:
+    CXX: g++-9
+    CXXFLAGS: -pipe -O2
+    DEBIAN_FRONTEND: noninteractive
+    LANG: C.utf8
+  commands:
+  - rm /etc/apt/apt.conf.d/docker-clean
+  - alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
+  - apt-get update -q
+  - apt-get install -qq build-essential cmake g++-10 clang pkg-config
+  - apt-get install -qq catch libcgicc-dev nlohmann-json3-dev
+  - rm -rf build && mkdir -p build && cd build
+  - cmake -G "Unix Makefiles" -DWITH_TESTS=YES ..
+  - make VERBOSE=1
+  - make install DESTDIR=install
+  - cd tests && ctest -V
+  - cd ../../
+  - rm -rf build && mkdir -p build && cd build
+  - CXX="g++-10" cmake -G "Unix Makefiles" -DWITH_TESTS=YES ..
+  - make VERBOSE=1
+  - make install DESTDIR=install
+  - cd tests && ctest -V
+  - cd ../../
+  - rm -rf build && mkdir -p build && cd build
+  - CXX="clang++" cmake -G "Unix Makefiles" -DWITH_TESTS=YES ..
+  - make VERBOSE=1
+  - make install DESTDIR=install
+  - cd tests && ctest -V
+  volumes:
+  - name: debian-package-cache
+    path: /var/cache/apt/archives
+
 - name: GCC 8 / clang 7
   image: debian:buster-slim
   pull: always