[CI] Post install tests

.github/workflows/root-ci.yml

@@ -428,6 +428,11 @@ jobs:
         CONTAINER_IMAGE: "registry.cern.ch/root-ci/${{ matrix.image }}:buildready" #KEEP IN SYNC WITH ABOVE
         CONTAINER_OPTIONS: "--security-opt label=disable --rm ${{ matrix.property == 'gpu' && '--device nvidia.com/gpu=all' || '' }}" #KEEP IN SYNC WITH ABOVE
 
+    env:
+      BUILD_DIR: /github/home/ROOT-CI/build
+      INSTALL_DIR: /github/home/ROOT-CI/install
+      POST_INSTALL_DIR: /github/home/ROOT-CI/PostInstall
+
     steps:
       - name: Configure large ccache
         if: ${{ matrix.is_special }}
@@ -571,6 +576,21 @@ jobs:
         run: |
           ccache -s || true
 
+      - name: Install
+        run: "cmake --install ${{ env.BUILD_DIR }} --prefix ${{ env.INSTALL_DIR }}"
+
+      - name: Post-install build
+        run: |
+          cmake -S test/PostInstall/ -B ${{ env.POST_INSTALL_DIR }} -DCMAKE_PREFIX_PATH=${{ env.INSTALL_DIR }};
+          cmake --build ${{ env.POST_INSTALL_DIR }};
+
+      - name: Post-install test
+        working-directory: ${{ env.POST_INSTALL_DIR }}
+        run: ctest -j $(nproc)
+
+      - name: Check installed headers
+        run: bash test/PostInstall/check-headers.sh ${{ env.INSTALL_DIR }}/include
+
   event_file:
     # For any event that is not a PR, the CI will always run. In PRs, the CI
     # can be skipped if the tag [skip-ci] or [skip ci] is written in the title.

test/PostInstall/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
+
+project(PostInstall)
+
+find_package(ROOT REQUIRED)
+
+add_executable(readHSimple readHSimple.cxx)
+target_link_libraries(readHSimple PUBLIC ROOT::Hist ROOT::RIO)
+
+include(CTest)
+
+if(BUILD_TESTING)
+  add_test(NAME run-hsimple
+    COMMAND ${ROOT_BINDIR}/root.exe -b -q -l -e ".x ${CMAKE_SOURCE_DIR}/../../tutorials/hsimple.C" -e "return"
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+  add_test(NAME read-hsimple
+    COMMAND $<TARGET_FILE:readHSimple>
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+  set_tests_properties(run-hsimple   PROPERTIES FIXTURES_SETUP    HSIMPLE)
+  set_tests_properties(read-hsimple  PROPERTIES FIXTURES_REQUIRED HSIMPLE)
+endif()

test/PostInstall/check-headers.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Adapted from the XRootD project with friendly permission from G. Amadio.
+#
+# This script checks that each installed ROOT header can be included individually
+# without errors. The intention is to identify which headers may have missing
+# includes, missing forward declarations, or missing header dependencies, that is,
+# headers from ROOT which it includes, but were not installed by the install target.
+
+# We need to split CXXFLAGS
+# shellcheck disable=SC2086
+
+: "${CXX:=c++}"
+: "${CXXFLAGS:=-std=c++17 -Wall -Wextra -Wno-unused-parameter -Wno-unused-const-variable}"
+: "${INCLUDE_DIR:=${1}}"
+: "${NCPU:=$(getconf _NPROCESSORS_ONLN)}"
+
+if ! command -v "${CXX}" >/dev/null; then
+	echo "Please set CXX to a valid compiler"
+  exit 2
+fi
+if [ ! -d "${INCLUDE_DIR}" ]; then
+  echo "Usage: ${0} <ROOT include directory>"
+  echo "Alternatively, set INCLUDE_DIR in the environment"
+  exit 2
+fi
+
+
+# Check all installed headers for include errors.
+HEADERS=$(find "${INCLUDE_DIR}" -type f -name '*.h*')
+
+xargs -P ${NCPU:-1} -n 1 "${CXX}" -fsyntax-only -x c++ ${CXXFLAGS} -I"${INCLUDE_DIR}" <<< "${HEADERS}" || exit 1
+

test/PostInstall/readHSimple.cxx

@@ -0,0 +1,19 @@
+#include <TH1.h>
+#include <TFile.h>
+
+int main()
+{
+   TFile file("hsimple.root", "READ");
+   if (!file.IsOpen())
+      return 1;
+
+   TH1 *histo = file.Get<TH1>("hpx");
+   if (!histo)
+      return 2;
+
+   if (histo->GetEntries() != 25000)
+      return 3;
+   histo->Print();
+
+   return 0;
+}