Fixes for gcc 16

root-Python-Fix-TF1-Pythonization-test-for-NumPy-2.4.0.patch

@@ -0,0 +1,82 @@
+From d5135f7869406396b3ba8e944c71dbdd67d3ea01 Mon Sep 17 00:00:00 2001
+From: Jonas Rembser <jonas.rembser@cern.ch>
+Date: Tue, 23 Dec 2025 19:04:45 +0100
+Subject: [PATCH] [Python] Fix TF1 Pythonization test for NumPy 2.4.0
+
+The new NumPy 2.4.0 is more strict when implicitly converting 1-element
+arrays to scalars. It doesn't do that anymore, causing the TF1
+Pythonization tests to fail (see log below).
+
+This actually pointed to a real mistake in setting up the test, where a
+2D array was used to define the TFormula parameters while it should be a
+1D array.
+
+```txt
+ 962/3718 Test   #93: pyunittests-bindings-pyroot-pythonizations-pyroot-pyz-tf-pycallables ..............................***Failed    3.05 sec
+test_callable (tf_pycallables.TF1.test_callable)
+Test function provided as callable ... ok
+test_evalpar (tf_pycallables.TF1.test_evalpar)
+Test the 2D Numpy array pythonizations for TF1::EvalPar ... ERROR
+test_evalpar_dynamic (tf_pycallables.TF1.test_evalpar_dynamic)
+Test the 2D NumPy pythonizations with dynamic TF1 data dimensions ... ok
+test_fitgauss (tf_pycallables.TF1.test_fitgauss)
+Test fitting a histogram to a Python function ... ok
+test_identity (tf_pycallables.TF1.test_identity)
+Test simple function without parameters ... ok
+test_params (tf_pycallables.TF1.test_params)
+Test function with parameters ... ok
+test_params (tf_pycallables.TF2.test_params)
+Test function with parameters ... ok
+test_params (tf_pycallables.TF3.test_params)
+Test function with parameters ... ok
+
+======================================================================
+ERROR: test_evalpar (tf_pycallables.TF1.test_evalpar)
+Test the 2D Numpy array pythonizations for TF1::EvalPar
+----------------------------------------------------------------------
+Traceback (most recent call last):
+  File "/github/home/ROOT-CI/src/bindings/pyroot/pythonizations/test/tf_pycallables.py", line 129, in test_evalpar
+    expected_value = pyf_tf1_coulomb(x[i, ::2], params)
+  File "/github/home/ROOT-CI/src/bindings/pyroot/pythonizations/test/tf_pycallables.py", line 33, in pyf_tf1_coulomb
+    return p[1] * x[0] * x[1] / (p[0]**2) * math.exp(-p[2] / p[0])
+                                            ~~~~~~~~^^^^^^^^^^^^^^
+TypeError: only 0-dimensional arrays can be converted to Python scalars
+
+----------------------------------------------------------------------
+Ran 8 tests in 1.469s
+
+FAILED (errors=1)
+CMake Error at /github/home/ROOT-CI/src/cmake/modules/RootTestDriver.cmake:232 (message):
+  error code: 1
+
+```
+---
+ .../pyroot/pythonizations/test/tf_pycallables.py     | 12 +++++++-----
+ 1 file changed, 7 insertions(+), 5 deletions(-)
+
+diff --git a/bindings/pyroot/pythonizations/test/tf_pycallables.py b/bindings/pyroot/pythonizations/test/tf_pycallables.py
+index 2a7d6b72462..5a223030ec9 100644
+--- a/bindings/pyroot/pythonizations/test/tf_pycallables.py
++++ b/bindings/pyroot/pythonizations/test/tf_pycallables.py
+@@ -116,11 +116,13 @@ class TF1(unittest.TestCase):
+             [3.0, 10, 4.0]
+         ])
+ 
+-        params = np.array([
+-            [1.0],       # Distance between charges r
+-            [8.99e9],    # Coulomb constant k (in N·m²/C²)
+-            [0.1]        # Additional factor for modulation
+-        ])
++        params = np.array(
++            [
++                1.0,  # Distance between charges r
++                8.99e9,  # Coulomb constant k (in N·m²/C²)
++                0.1,  # Additional factor for modulation
++            ]
++        )
+ 
+         # Slice to avoid the dummy column of 10's
+         res = rtf1_coulomb.EvalPar(x[:, ::2], params)
+-- 
+2.52.0
+

root-RF-Use-TRandom3-in-test-RooFuncWrapper.patch

@@ -0,0 +1,50 @@
+From e1f42658629ad67ce7cb224a1379d133f61f2e35 Mon Sep 17 00:00:00 2001
+From: Jonas Rembser <jonas.rembser@cern.ch>
+Date: Sun, 11 Jan 2026 10:25:51 +0100
+Subject: [PATCH] [RF] Use TRandom3 in test RooFuncWrapper
+
+Use TRandom3 instead of the `<random>` to get compiler-independent,
+reproducible behavior.
+---
+ roofit/roofitcore/test/testRooFuncWrapper.cxx | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/roofit/roofitcore/test/testRooFuncWrapper.cxx b/roofit/roofitcore/test/testRooFuncWrapper.cxx
+index 2ebdf95333f..189e8f2e266 100644
+--- a/roofit/roofitcore/test/testRooFuncWrapper.cxx
++++ b/roofit/roofitcore/test/testRooFuncWrapper.cxx
+@@ -34,12 +34,12 @@
+ #include <RooWorkspace.h>
+ 
+ #include <ROOT/StringUtils.hxx>
++#include <TMath.h>
+ #include <TROOT.h>
++#include <TRandom3.h>
+ #include <TSystem.h>
+-#include <TMath.h>
+ 
+ #include <functional>
+-#include <random>
+ 
+ #include "gtest_wrapper.h"
+ 
+@@ -66,13 +66,13 @@ double getNumDerivative(const RooAbsReal &pdf, RooRealVar &var, const RooArgSet
+ 
+ void randomizeParameters(const RooArgSet &parameters)
+ {
++   TRandom3 rng(1337);
++
+    double lowerBound = -0.1;
+    double upperBound = 0.1;
+-   std::uniform_real_distribution<double> unif(lowerBound, upperBound);
+-   std::default_random_engine re;
+ 
+    for (auto *param : parameters) {
+-      double mul = unif(re);
++      double mul = rng.Uniform(lowerBound, upperBound);
+ 
+       auto par = dynamic_cast<RooAbsRealLValue *>(param);
+       if (!par)
+-- 
+2.52.0
+

root-fontconfig.patch

@@ -1,4 +1,4 @@
-From b5735870eb7e65a8c840643540a0676ab40697e0 Mon Sep 17 00:00:00 2001
+From 4d450f306a8ab8220f43675c70f399d89e5a4a03 Mon Sep 17 00:00:00 2001
 From: Mattias Ellert <mattias.ellert@physics.uu.se>
 Date: Sat, 11 May 2024 20:09:47 +0200
 Subject: [PATCH] Use system fonts via fontconfig
@@ -9,13 +9,13 @@ Subject: [PATCH] Use system fonts via fontconfig
  graf2d/asimage/src/TASImage.cxx       |  91 +++++++-
  graf2d/graf/CMakeLists.txt            |   1 +
  graf2d/graf/inc/TTF.h                 |   3 +-
- graf2d/graf/src/TTF.cxx               | 291 +++++++++++++++++---------
+ graf2d/graf/src/TTF.cxx               | 295 +++++++++++++++++---------
  graf2d/postscript/CMakeLists.txt      |   1 +
- graf2d/postscript/src/TPostScript.cxx | 106 +++++-----
+ graf2d/postscript/src/TPostScript.cxx | 106 ++++-----
  graf3d/gl/CMakeLists.txt              |   1 +
  graf3d/gl/src/TGLFontManager.cxx      | 123 ++++++++++-
  graf3d/gl/src/TGLText.cxx             |  56 +++--
- 11 files changed, 493 insertions(+), 192 deletions(-)
+ 11 files changed, 495 insertions(+), 194 deletions(-)
 
 diff --git a/core/base/src/TApplication.cxx b/core/base/src/TApplication.cxx
 index f0d2124a8f6..41ad4c73020 100644
@@ -207,7 +207,7 @@ index 864ce06b4f0..050796d1ded 100644
     static TTF::TTGlyph   fgGlyphs[kMaxGlyphs];    ///< glyphs
     static Bool_t         fgHinting;               ///< use hinting (true by default)
 diff --git a/graf2d/graf/src/TTF.cxx b/graf2d/graf/src/TTF.cxx
-index 758bb98c192..7b1b06cd0ed 100644
+index 758bb98c192..c90d0ac70a9 100644
 --- a/graf2d/graf/src/TTF.cxx
 +++ b/graf2d/graf/src/TTF.cxx
 @@ -25,6 +25,8 @@ Interface to the freetype 2 library.
@@ -453,9 +453,12 @@ index 758bb98c192..7b1b06cd0ed 100644
        Error("TTF::SetTextFont", "error loading font %s", ttfont);
        delete [] ttfont;
        if (tface) FT_Done_Face(tface);
-@@ -453,19 +573,20 @@ Int_t TTF::SetTextFont(const char *fontname, Int_t italic)
+@@ -450,24 +570,25 @@ Int_t TTF::SetTextFont(const char *fontname, Int_t italic)
-    delete [] ttfont;
+       }
+    }
  
+-   delete [] ttfont;
+-
     fgFontName[fgFontCount] = StrDup(basename);
 +   fgFontIdx[fgFontCount]  = ttindex;
 +   fgFontIta[fgFontCount]  = italic;
@@ -476,7 +479,11 @@ index 758bb98c192..7b1b06cd0ed 100644
 +      FT_Set_Transform( fgFace[fgCurFontIdx], &slantMat, nullptr );
     }
  
++   delete [] ttfont;
++
     return 0;
+ }
+ 
 @@ -494,70 +615,50 @@ Int_t TTF::SetTextFont(const char *fontname, Int_t italic)
  
  void TTF::SetTextFont(Font_t fontnumber)

root-gcc-16-libstdc-links-to-libatomic.patch

@@ -0,0 +1,32 @@
+From 7b1632f5602a1bb6e6278d66c25640349c852ab1 Mon Sep 17 00:00:00 2001
+From: Mattias Ellert <mattias.ellert@physics.uu.se>
+Date: Fri, 9 Jan 2026 00:32:27 +0100
+Subject: [PATCH] Starting with gcc 16, libstdc++ links to libatomic. Add to
+ whitelist.
+
+$ ldd /lib64/libstdc++.so.6
+	linux-vdso.so.1 (0x00007f3cb4c13000)
+	libm.so.6 => /lib64/libm.so.6 (0x00007f3cb4afc000)
+	libatomic.so.1 => /lib64/libatomic.so.1 (0x00007f3cb4af1000)
+	libc.so.6 => /lib64/libc.so.6 (0x00007f3cb460d000)
+	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f3cb4ac5000)
+	/lib64/ld-linux-x86-64.so.2 (0x00007f3cb4c15000)
+---
+ bindings/pyroot/pythonizations/test/import_load_libs.py | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/bindings/pyroot/pythonizations/test/import_load_libs.py b/bindings/pyroot/pythonizations/test/import_load_libs.py
+index 63feeca89ba..18906ff921e 100644
+--- a/bindings/pyroot/pythonizations/test/import_load_libs.py
++++ b/bindings/pyroot/pythonizations/test/import_load_libs.py
+@@ -77,6 +77,7 @@ class ImportLoadLibs(unittest.TestCase):
+         "ld.*",
+         "libffi",
+         "libgcc_s",
++        "libatomic",
+         # AddressSanitizer runtime and ROOT configuration
+         "libclang_rt.asan-.*",
+         "libROOTSanitizerConfig",
+-- 
+2.52.0
+

root.spec

@@ -39,7 +39,7 @@
 Name:		root
 Version:	6.38.00
 %global libversion %(cut -d. -f 1-2 <<< %{version})
-Release:	4%{?dist}
+Release:	6%{?dist}
 Summary:	Numerical data analysis framework
 
 License:	LGPL-2.1-or-later
@@ -100,6 +100,16 @@ Patch13:	%{name}-cppyy-Remove-code-related-to-finding-CPyCppyy-API-he.patch
 #		Don't install the python modules twice
 #		https://github.com/root-project/root/pull/20753
 Patch14:	%{name}-PyROOT-Don-t-install-the-python-modules-twice.patch
+#		Fix test for stricter syntax in numpy 2.4.0 (backport)
+#		https://github.com/root-project/root/pull/20775
+Patch15:	%{name}-Python-Fix-TF1-Pythonization-test-for-NumPy-2.4.0.patch
+#		Starting with gcc 16, libstdc++ links to libatomic
+#		https://github.com/root-project/root/pull/20826
+Patch16:	%{name}-gcc-16-libstdc-links-to-libatomic.patch
+#		Test fails with gcc 16 (which uses c++20 as default)
+#		https://github.com/root-project/root/issues/20831
+#		https://github.com/root-project/root/pull/20841
+Patch17:	%{name}-RF-Use-TRandom3-in-test-RooFuncWrapper.patch
 
 BuildRequires:	gcc-c++
 BuildRequires:	gcc-gfortran
@@ -1905,6 +1915,9 @@ This package contains a library for histogramming in ROOT 7.
 %patch -P12 -p1
 %patch -P13 -p1
 %patch -P14 -p1
+%patch -P15 -p1
+%patch -P16 -p1
+%patch -P17 -p1
 
 # Remove bundled sources in order to be sure they are not used
 #  * afterimage
@@ -2471,6 +2484,7 @@ gtest-roofit-roofitcore-testLikelihoodGradientJob"
 # - gtest-tree-ntuple-ntuple-join-table
 # - gtest-tree-ntuple-ntuple-largefile2
 # - gtest-tree-ntuple-ntuple-merger
+# - gtest-tree-ntuple-ntuple-metrics
 # - gtest-tree-ntuple-ntuple-model
 # - gtest-tree-ntuple-ntuple-modelext
 # - gtest-tree-ntuple-ntuple-multi-column
@@ -2527,6 +2541,7 @@ gtest-tree-ntuple-ntuple-extended|\
 gtest-tree-ntuple-ntuple-join-table|\
 gtest-tree-ntuple-ntuple-largefile2|\
 gtest-tree-ntuple-ntuple-merger|\
+gtest-tree-ntuple-ntuple-metrics|\
 gtest-tree-ntuple-ntuple-model\$\$|\
 gtest-tree-ntuple-ntuple-modelext|\
 gtest-tree-ntuple-ntuple-multi-column|\
@@ -2594,6 +2609,9 @@ gtest-math-matrix-testMatrixTSparse"
 
 # Filter out parts of tests that require remote network access
 # RNTuple.StdAtomic fails on ix86 (different alignment 64 bit (non)atomic)
+# TH3D.FillThreadSafe and RDFHelpers.Histo3DThreadSafe fail on ix86
+# due to alignment issues with std::atomic_ref
+# https://github.com/root-project/root/issues/20834
 # InterpreterTest.Evaluate fails on s390x
 # TClingDataMemberInfo.Offset fails on s390x
 # https://github.com/root-project/root/issues/14512
@@ -2603,6 +2621,8 @@ gtest-math-matrix-testMatrixTSparse"
 export GTEST_FILTER=-\
 %ifarch %{ix86}
 RNTuple.StdAtomic:\
+TH3D.FillThreadSafe:\
+RDFHelpers.Histo3DThreadSafe:\
 %endif
 %ifarch s390x
 InterpreterTest.Evaluate:\
@@ -3456,6 +3476,12 @@ fi
 %endif
 
 %changelog
+* Mon Jan 12 2026 Mattias Ellert <mattias.ellert@physics.uu.se> - 6.38.00-6
+- Fixes for gcc 16
+
+* Thu Dec 25 2025 Mattias Ellert <mattias.ellert@physics.uu.se> - 6.38.00-5
+- Fix test for stricter syntax in numpy 2.4.0 (backport)
+
 * Fri Dec 19 2025 Mattias Ellert <mattias.ellert@physics.uu.se> - 6.38.00-4
 - Exclude tests for Fedora 43+ on s390x that fail due to hardware
   acceleration in the zlib-ng library.