bump ROOT to 6.36 #147
Description
The ROOT 6.36 bump is getting complicated, so I'm making an issue for my notes.
Just changing the version number without changing anything else is working on x86_64 (AMD) but failing on the ARM build.
- https://github.com/LDMX-Software/dev-build-context/actions/runs/18495543743
- https://github.com/LDMX-Software/dev-build-context/actions/runs/18495543743/job/52920879075#step:7:17870
Output copied for posterity: bump-root-naive-6.36-ci-logs.tar.gz
ROOT Compilation Failure:
#18 113867.4 [ 76%] Built target Tree
#18 113867.7 [ 76%] Generating G__TreePlayer.cxx, ../../lib/TreePlayer.pcm
#18 113873.3 In file included from input_line_10:34:
#18 113873.3 /build/include/TMPWorkerTree.h:16:10: remark: building module 'MultiProc' as '/build/lib/MultiProc.pcm' [-Rmodule-build]
#18 113873.4 #include "TMPWorker.h"
#18 113873.4 ^
#18 113873.4 Error: Building module 'MultiProc' implicitly. If 'MultiProc' requires a
#18 113873.4 dictionary please specify build dependency: 'G__TreePlayer.cxx' depends on 'MultiProc'.
#18 113873.4 Otherwise, specify '-mByproduct MultiProc' to disable this diagnostic.
#18 113902.7 gmake[2]: *** [tree/treeplayer/CMakeFiles/G__TreePlayer.dir/build.make:153: tree/treeplayer/G__TreePlayer.cxx] Error 1
#18 113902.7 gmake[1]: *** [CMakeFiles/Makefile2:41050: tree/treeplayer/CMakeFiles/G__TreePlayer.dir/all] Error 2
#18 113902.8 gmake: *** [Makefile:156: all] Error 2
#18 ERROR: process "/bin/sh -c mkdir src && ${__wget} [https://root.cern/download/root_v${ROOT_VERSION}.source.tar.gz](https://root.cern/download/root_v$%7BROOT_VERSION%7D.source.tar.gz) | ${__untar} && cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_STANDARD=20 -DCMAKE_INSTALL_PREFIX=${__prefix} -DCMAKE_INSTALL_LIBDIR=lib -Dgnuinstall=ON -Dgminimal=ON -Dasimage=ON -Dgeom=ON -Dgdml=ON -Dopengl=ON -Dpyroot=ON -Dxrootd=OFF -Dmathmore=ON -Dpythia8=ON -B build -S src && cmake --build build --target install -j$NPROC && rm -rf build src && ldconfig" did not complete successfully: exit code: 2
------
> [11/29] RUN mkdir src && wget -q -O - https://root.cern/download/root_v6.36.04.source.tar.gz | tar -xz --strip-components=1 --directory src && cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_STANDARD=20 -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_INSTALL_LIBDIR=lib -Dgnuinstall=ON -Dgminimal=ON -Dasimage=ON -Dgeom=ON -Dgdml=ON -Dopengl=ON -Dpyroot=ON -Dxrootd=OFF -Dmathmore=ON -Dpythia8=ON -B build -S src && cmake --build build --target install -j1 && rm -rf build src && ldconfig:
input_line_10:34:
113873.3 /build/include/TMPWorkerTree.h:16:10: remark: building module 'MultiProc' as '/build/lib/MultiProc.pcm' [-Rmodule-build]
113873.4 #include "TMPWorker.h"
113873.4 ^
113873.4 Error: Building module 'MultiProc' implicitly. If 'MultiProc' requires a
113873.4 dictionary please specify build dependency: 'G__TreePlayer.cxx' depends on 'MultiProc'.
113873.4 Otherwise, specify '-mByproduct MultiProc' to disable this diagnostic.
113902.7 gmake[2]: *** [tree/treeplayer/CMakeFiles/G__TreePlayer.dir/build.make:153: tree/treeplayer/G__TreePlayer.cxx] Error 1
113902.7 gmake[1]: *** [CMakeFiles/Makefile2:41050: tree/treeplayer/CMakeFiles/G__TreePlayer.dir/all] Error 2
113902.8 gmake: *** [Makefile:156: all] Error 2
The official ROOT docker container does not do an ARM build1 so I think I have to figure it out myself.
ROOT has the same CMake configuration as far as I can tell:
tom@iroh:~/Downloads/ci-logs$ grep 'Enabled support for' build-a*
build-amd64.txt:2025-10-14T12:07:19.3084607Z #18 37.84 -- Enabled support for: asimage builtin_clang builtin_cling builtin_llvm builtin_xxhash gdml geom gnuinstall mathmore opengl pyroot pythia8 runtime_cxxmodules shared x11
build-arm64.txt:2025-10-16T17:12:56.4182890Z #18 489.1 -- Enabled support for: asimage builtin_clang builtin_cling builtin_llvm builtin_xxhash gdml geom gnuinstall mathmore opengl pyroot pythia8 runtime_cxxmodules shared x11
so its not like we are accidentally building something in ARM that wasn't built in AMD.