pyrox.dev
root: enable `clad` for automatic differentiation in ROOT
Clad is a clang plugin that can be used in Cling to create gradients of
C++ functions.
It is included in ROOT via `ExternalProject_Add`:
https://github.com/root-project/root/blob/master/interpreter/cling/tools/plugins/clad/CMakeLists.txt
Clad is used for example in RooFit to create analytical gradients of
likelihoods.
+24
-1
pkgs/applications/science/misc/root/default.nix
+24
-1
pkgs/applications/science/misc/root/default.nix
···
1
1
{ stdenv
2
2
, lib
3
3
, callPackage
4
+
, fetchgit
4
5
, fetchurl
5
6
, fetchpatch
6
7
, makeWrapper
···
66
67
src = fetchurl {
67
68
url = "https://root.cern.ch/download/root_v${version}.source.tar.gz";
68
69
hash = "sha256-MA237RtnjtL7ljXKZ1khoZRcfCED2oQAM7STCR9VcAw=";
70
+
};
71
+
72
+
clad_src = fetchgit {
73
+
url = "https://github.com/vgvassilev/clad";
74
+
rev = "refs/tags/v1.4"; # Make sure that this is the same tag as in the ROOT build files!
75
+
hash = "sha256-OI9PaS7kQ/ewD5Soe3gG5FZdlR6qG6Y3mfHwi5dj1sI=";
69
76
};
70
77
71
78
nativeBuildInputs = [ makeWrapper cmake pkg-config git ];
···
131
138
substituteInPlace cmake/modules/SearchInstalledSoftware.cmake \
132
139
--replace 'set(lcgpackages ' '#set(lcgpackages '
133
140
141
+
# We have to bypass the connection check, because it would disable clad.
142
+
# This should probably be fixed upstream with a flag to disable the
143
+
# connectivity check!
144
+
substituteInPlace CMakeLists.txt \
145
+
--replace 'if(NO_CONNECTION)' 'if(FALSE)'
146
+
substituteInPlace interpreter/cling/tools/plugins/CMakeLists.txt \
147
+
--replace 'if(NOT DEFINED NO_CONNECTION OR NOT NO_CONNECTION)' 'if(TRUE)'
148
+
# Make sure that clad is not downloaded when building
149
+
substituteInPlace interpreter/cling/tools/plugins/clad/CMakeLists.txt \
150
+
--replace 'UPDATE_COMMAND ""' 'SOURCE_DIR ${clad_src} DOWNLOAD_COMMAND "" UPDATE_COMMAND ""'
151
+
# Make sure that clad is finding the right llvm version
152
+
substituteInPlace interpreter/cling/tools/plugins/clad/CMakeLists.txt \
153
+
--replace '-DLLVM_DIR=''${LLVM_BINARY_DIR}' '-DLLVM_DIR=${llvm_13.dev}/lib/cmake/llvm'
154
+
# Fix that will also be upstream in ROOT 6.32. TODO: remove it when updating to 6.32
155
+
substituteInPlace interpreter/cling/tools/plugins/clad/CMakeLists.txt \
156
+
--replace 'set(_CLAD_LIBRARY_PATH ''${clad_install_dir}/plugins/lib)' 'set(_CLAD_LIBRARY_PATH ''${CMAKE_CURRENT_BINARY_DIR}/clad-prefix/src/clad-build/lib''${LLVM_LIBDIR_SUFFIX})'
157
+
134
158
substituteInPlace interpreter/llvm-project/clang/tools/driver/CMakeLists.txt \
135
159
--replace 'add_clang_symlink(''${link} clang)' ""
136
160
···
155
179
"-DCMAKE_INSTALL_LIBDIR=lib"
156
180
"-DCMAKE_INSTALL_INCLUDEDIR=include"
157
181
"-Dbuiltin_llvm=OFF"
158
-
"-Dclad=OFF"
159
182
"-Dfail-on-missing=ON"
160
183
"-Dfitsio=OFF"
161
184
"-Dgnuinstall=ON"