[cmake] Do not auto force-enable or force-disable user CMake build options

.github/workflows/root-ci-config/buildconfig/alma10-minimal-asan.txt

@@ -4,6 +4,7 @@ asan=ON
 ccache=ON
 builtin_civetweb=ON
 builtin_vdt=ON
+daos_mock=ON
 fail-on-missing=ON
 minimal=ON
 roottest=ON

.github/workflows/root-ci-config/buildconfig/alma10-minimal.txt

@@ -1,6 +1,7 @@
 ccache=ON
 builtin_civetweb=ON
 builtin_vdt=ON
+daos_mock=ON
 fail-on-missing=ON
 minimal=ON
 roottest=ON

.github/workflows/root-ci-config/buildconfig/global.txt

@@ -36,6 +36,7 @@ coverage=OFF
 cuda=OFF
 curl=ON
 daos=OFF
+daos_mock=ON
 dataframe=ON
 davix=ON
 dcache=OFF
@@ -81,6 +82,7 @@ test_distrdf_pyspark=ON
 test_roofit_hs3testsuite=ON
 test_tmva_sofie=ON
 testing=ON
+testsupport=OFF
 tmva-cpu=ON
 tmva-gpu=OFF
 tmva-cudnn=OFF

.github/workflows/root-ci-config/buildconfig/windows10.txt

@@ -19,6 +19,7 @@ builtin_xxhash=ON
 builtin_zlib=ON
 builtin_zstd=ON
 ccache=OFF
+daos_mock=OFF
 davix=OFF
 fortran=OFF
 llvm13_broken_tests=OFF

.github/workflows/root-ci.yml

@@ -158,7 +158,7 @@
           INCREMENTAL: ${{ !contains(github.event.pull_request.labels.*.name, 'clean build') && !matrix.platform == 'mac15' && !matrix.platform == 'mac26'}}
           GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
           OVERRIDES: ${{ join( matrix.overrides, ' ') }}
         run: |
           [ -d "${VIRTUAL_ENV_DIR}" ] && source ${VIRTUAL_ENV_DIR}/bin/activate
           echo "Python is now $(which python3) $(python3 --version)"
           src/.github/workflows/root-ci-config/build_root.py  \
@@ -312,7 +312,7 @@
           INCREMENTAL: ${{ !contains(github.event.pull_request.labels.*.name, 'clean build') }}
           GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
         shell: cmd
         run: "C:\\setenv.bat ${{ matrix.target_arch }} &&
               python .github/workflows/root-ci-config/build_root.py
                     --buildtype       ${{ matrix.config }}
                     --platform        windows10
@@ -418,7 +418,7 @@
             overrides: ["CMAKE_BUILD_TYPE=Debug"]
           - image: alma10
           - image: ubuntu22
-            overrides: ["imt=Off", "CMAKE_BUILD_TYPE=Debug"]
+            overrides: ["imt=Off", "tmva-cpu=OFF", "CMAKE_BUILD_TYPE=Debug"]
           - image: ubuntu2404
             overrides: ["CMAKE_BUILD_TYPE=Debug"]
           - image: ubuntu2604
@@ -479,7 +479,7 @@
       - self-hosted
       - linux
       - ${{ matrix.architecture == null && 'x64' || matrix.architecture }}
       - ${{ matrix.extra-runs-on == null && 'cpu' || matrix.extra-runs-on }}
 
     name: |
       ${{ matrix.image }} ${{ matrix.property }}

.github/workflows/root-docs-ci.yml

@@ -98,7 +98,7 @@ jobs:
 
     - name: Apply option overrides
       env:
-        OVERRIDES: "testing=Off roottest=Off"
+        OVERRIDES: "testing=Off", "roottest=Off", "daos_mock=Off"
         CONFIGFILE: '.github/workflows/root-ci-config/buildconfig/alma9.txt'
       shell: bash
       run: |

README/ReleaseNotes/v642/index.md

@@ -44,6 +44,7 @@ The following people have contributed to this new version:
   Note that `all=ON` enables several of these options, so building with `-Dall=ON` now requires all of their dependencies to be installed, or the unwanted ones to be disabled explicitly.
   Build options that are enabled by default, such as `pyroot`, `opengl`, `xml`, `sqlite`, `davix`, `curl`, `tmva-cpu` or `tpython` are not affected: they are still disabled automatically when their dependencies are missing.
 * The option `fail-on-missing=OFF` will no longer be honored for CMake ROOT build options that have easy-to-install dependencies (e.g. via homebrew or apt-get), such as those required by options `cfitsio`, `civetweb`, `fftw3`, `imt`, `mathmore`, `nlohmann_json`, `tmva-cpu`, `unuran`, `vdt` or `xrootd`. Before, associated `builtin_option` was automatically turned ON (or the opt-in feature turned to OFF), now, user has to install system package or manually set `builtin_option` to `ON` or opt-in feature to `OFF`.
+* Irrespective of the value of `fail-on-missing`, all ROOT build options that are contradictory or are missing a dependency will now raise an error rather than letting the build system to automatically turn features OFF or ON. A helpful error message will be printed stating what packages need to be installed or what build flags need to be changed.
 * The method `RooRealVar::removeRange()` and the corresponding method in `RooErrorVar` that were deprecated in ROOT 6.40 are now removed.
 * The overloads of `RooAbsReal::createChi2()` and `RooAbsReal::chi2FitTo()` that take unbinned **RooDataSet** data objects were deprecated in ROOT 6.40 and are now removed.
 * The **RooStats::HybridPlot** class and the related **HybridResult::GetPlot** method were deprecated in ROOT 6.40 and are now removed.

cmake/modules/CheckCompiler.cmake

@@ -51,6 +51,8 @@ if(fortran)
   endif()
   if(NOT CMAKE_Fortran_COMPILER)
     message(SEND_ERROR "No Fortran compiler found. Please make sure it's installed, or disable ROOT's Fortran features with '-Dfortran=OFF'")
+    list(APPEND MISSING_PACKAGES 'gfortran')
+    list(APPEND HOTFIX_BUILD_FLAGS -Dfortran=OFF)
   endif()
 else()
   set(CMAKE_Fortran_COMPILER CMAKE_Fortran_COMPILER-NOTFOUND)

cmake/modules/RootBuildOptions.cmake

@@ -120,6 +120,7 @@ ROOT_BUILD_OPTION(coverage OFF "Enable compile flags for coverage testing")
 ROOT_BUILD_OPTION(cuda OFF "Enable support for CUDA (requires CUDA toolkit >= 7.5)")
 ROOT_BUILD_OPTION(curl ON "Enable support for HTTP(S) through libcurl")
 ROOT_BUILD_OPTION(daos OFF "Enable RNTuple support for Intel DAOS")
+ROOT_BUILD_OPTION(daos_mock OFF "Use libdaos_mock for RNTuple, use only for testing. Mutually exclusive with daos")
 ROOT_BUILD_OPTION(dataframe ON "Enable ROOT RDataFrame")
 ROOT_BUILD_OPTION(davix ON "Enable support for Davix (HTTP/WebDAV access)")
 ROOT_BUILD_OPTION(dcache OFF "Enable support for dCache (requires libdcap from DESY)")
@@ -155,14 +156,14 @@ ROOT_BUILD_OPTION(roofit_multiprocess OFF "Build RooFit::MultiProcess and multi-
 ROOT_BUILD_OPTION(root7 ON "Build ROOT 7 experimental components of ROOT")
 ROOT_BUILD_OPTION(runtime_cxxmodules ON "Enable runtime support for C++ modules")
 ROOT_BUILD_OPTION(shadowpw OFF "Enable support for shadow passwords")
-ROOT_BUILD_OPTION(shared ON "Use shared 3rd party libraries if possible")
+ROOT_BUILD_OPTION(shared ON "Use shared 3rd party libraries if possible (OFF not supported on Windows)")
 ROOT_BUILD_OPTION(soversion OFF "Set version number in sonames for shared libraries. Not recommended, as the pcm and rootmap files do not (yet) support versioning and always point to the non-versioned shared libraries.")
 ROOT_BUILD_OPTION(spectrum ON "Enable support for TSpectrum")
 ROOT_BUILD_OPTION(sqlite ON "Enable support for SQLite")
 ROOT_BUILD_OPTION(ssl ON "Enable support for SSL encryption via OpenSSL")
 ROOT_BUILD_OPTION(test_distrdf_dask OFF "Enable distributed RDataFrame tests that use dask")
 ROOT_BUILD_OPTION(test_distrdf_pyspark OFF "Enable distributed RDataFrame tests that use pyspark")
-ROOT_BUILD_OPTION(testsupport OFF "Build the ROOT::TestSupport library required to use all features of ROOT_ADD_GTEST and similar macros (requires gtest at build time)")
+ROOT_BUILD_OPTION(testsupport OFF "Build the ROOT::TestSupport library required to use ROOT_ADD_GTEST and similar macros by downstream users (requires gtest at build time). Even if OFF, this library is still built if testing=ON")
 ROOT_BUILD_OPTION(thisroot_scripts ON "Build scripts like thisroot.{sh, fish, etc.} that set environment paths for using ROOT. Usually not needed when building ROOT for the distribution with a package manager.")
 ROOT_BUILD_OPTION(tmva ON "Build TMVA multi variate analysis library")
 ROOT_BUILD_OPTION(tmva-cpu ON "Build TMVA with CPU support for deep learning (requires BLAS)")
@@ -188,11 +189,11 @@ option(clingtest "Enable cling tests (Note: that this makes llvm/clang symbols v
 option(fail-on-missing "Fail at configure time if a required package cannot be found" OFF)
 option(gminimal "Enable only required options by default, but include X11/Cocoa" OFF)
 option(minimal "Enable only required options by default" OFF)
-option(rootbench "Build rootbench if rootbench exists in root or if it is a sibling directory (implies testing=ON)" OFF)
-option(roottest "Build roottest (implies testing=ON)" OFF)
+option(rootbench "Build rootbench if rootbench exists in root or if it is a sibling directory (requires testing=ON)" OFF)
+option(roottest "Build roottest (requires testing=ON)" OFF)
 option(test_roofit_hs3testsuite "Setup and use the HS3 conformance test suite (requires network)" OFF)
 option(test_tmva_sofie "Enable SOFIE tests (requires BLAS library that can be found with CMake's FindBLAS)" ON)
-option(testing "Enable testing with CTest" OFF)
+option(testing "Enable testing with CTest and GTest" OFF)
 option(asan "Build ROOT with address sanitizer instrumentation (see core/sanitizer for details)" OFF)
 option(_wheel_build "ROOT is being packaged as a wheel, do not install .dist-info metadata" OFF)
 
@@ -332,45 +333,49 @@ endif()
 #---Define at moment the options with the selected default values------------------------------
 ROOT_APPLY_OPTIONS()
 
-#---roottest option implies testing
-if(roottest OR rootbench)
-  set(testing ON CACHE BOOL "" FORCE)
+#---roottest/rootbench options require testing
+if (roottest AND NOT testing)
+  message(SEND_ERROR "-Droottest=ON requires -Dtesting=ON")
+  list(APPEND HOTFIX_BUILD_FLAGS -Dtesting=ON)
 endif()
-
-#---testing implies testsupport
-if(testing)
-  set(testsupport ON CACHE BOOL "" FORCE)
-endif()
-
-#---ensure that the cuda option is sound
-if(cuda AND NOT CMAKE_CUDA_COMPILER)
-  message(FATAL_ERROR "Option cuda=On, but CMAKE_CUDA_COMPILER='${CMAKE_CUDA_COMPILER}'")
+if (rootbench AND NOT testing)
+  message(SEND_ERROR "-Drootbench=ON requires -Dtesting=ON")
+  list(APPEND HOTFIX_BUILD_FLAGS -Dtesting=ON)
 endif()
 
 #---running HS3 test suite requires both testing and pyroot, but testing globally disables tests
 if(testing AND test_roofit_hs3testsuite AND NOT pyroot)
-  message(FATAL_ERROR "-Dtest_roofit_hs3testsuite=ON requires both -Dtesting=ON and -Dpyroot=ON)")
+  message(SEND_ERROR "-Dtest_roofit_hs3testsuite=ON requires both -Dtesting=ON and -Dpyroot=ON)")
+  list(APPEND HOTFIX_BUILD_FLAGS -Dpyroot=ON)
 endif()
 
 if(unfold AND NOT xml)
-  message(STATUS "Cannot enable unfold without enabling xml: unfold is disabled.")
-  set(unfold OFF)
+  message(SEND_ERROR "Cannot enable unfold without enabling -Dxml=ON.")
+  list(APPEND HOTFIX_BUILD_FLAGS -Dxml=ON)
 endif()
 
 if (NOT builtin_cling)
   if (builtin_clang OR builtin_llvm)
     message(WARNING "No need to build internal llvm or clang. Consider turning builtin_clang=Off and builtin_llvm=Off")
+    list(APPEND HOTFIX_BUILD_FLAGS -Dbuiltin_clang=OFF)
+    list(APPEND HOTFIX_BUILD_FLAGS -Dbuiltin_llvm=OFF)
   endif()
 endif(NOT builtin_cling)
 
 if(NOT http AND webgui)
-   message(WARNING "Cannot build WebGui components without HTTP: webgui is disabled.")
-   set(webgui OFF)
+   message(SEND_ERROR "Cannot build WebGui components without HTTP: enable -Dhttp=ON or set -Dwebgui=OFF.")
+   list(APPEND HOTFIX_BUILD_FLAGS -Dwebgui=OFF)
 endif()
 
 if(NOT webgui)
-   set(qt6web OFF CACHE BOOL "Disabled because webgui not build" FORCE)
-   set(cefweb OFF CACHE BOOL "Disabled because webgui not build" FORCE)
+    if(qt6web)
+        message(SEND_ERROR "Cannot build qt6web without webgui and http: enable -Dwebgui=ON -Dhttp=ON or set -Dqt6web=OFF.")
+        list(APPEND HOTFIX_BUILD_FLAGS -Dqt6web=OFF)
+    endif()
+    if(qt6web)
+        message(SEND_ERROR "Cannot build cefweb without webgui and http: enable -Dwebgui=ON -Dhttp=ON or set -Dcefweb=OFF.")
+        list(APPEND HOTFIX_BUILD_FLAGS -Dcefweb=OFF)
+    endif()
 endif()
 
 #---Removed options------------------------------------------------------------