Build Python 3.14 with zlib-ng on all platforms

.ci_support/linux_64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingno.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingyes.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_64_build_typereleasechannel_targetsconda-forge_mainfreethreadingno.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_64_build_typereleasechannel_targetsconda-forge_mainfreethreadingyes.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_aarch64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingno.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_aarch64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingyes.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_aarch64_build_typereleasechannel_targetsconda-forge_mainfreethreadingno.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_aarch64_build_typereleasechannel_targetsconda-forge_mainfreethreadingyes.yaml

@@ -53,7 +53,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_ppc64le_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingno.yaml

@@ -51,7 +51,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_ppc64le_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingyes.yaml

@@ -51,7 +51,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_ppc64le_build_typereleasechannel_targetsconda-forge_mainfreethreadingno.yaml

@@ -51,7 +51,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/linux_ppc64le_build_typereleasechannel_targetsconda-forge_mainfreethreadingyes.yaml

@@ -51,7 +51,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingno.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingyes.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_64_build_typereleasechannel_targetsconda-forge_mainfreethreadingno.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_64_build_typereleasechannel_targetsconda-forge_mainfreethreadingyes.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_arm64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingno.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_arm64_build_typedebugchannel_targetsconda-forge_python_debugfreethreadingyes.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_arm64_build_typereleasechannel_targetsconda-forge_mainfreethreadingno.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/osx_arm64_build_typereleasechannel_targetsconda-forge_mainfreethreadingyes.yaml

@@ -55,7 +55,7 @@ zip_keys:
   - channel_targets
 - - c_compiler_version
   - cxx_compiler_version
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/win_64_freethreadingno.yaml

@@ -37,7 +37,7 @@ tk:
 zip_keys:
 - - build_type
   - channel_targets
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

.ci_support/win_64_freethreadingyes.yaml

@@ -37,7 +37,7 @@ tk:
 zip_keys:
 - - build_type
   - channel_targets
-zlib:
-- '1'
+zlib_ng:
+- '2.2'
 zstd:
 - '1.5'

recipe/build_base.sh

@@ -11,6 +11,21 @@ if [[ ! -d ${SRC_DIR}/python-bin ]]; then
   export PATH=${SRC_DIR}/python-bin/bin:${PATH}
 fi
 
+# tcl/tk seem to add a dependency against zlib
+# but they actually do not appear in the header files
+# so they aren't useful in the context off dynamic linking
+# https://github.com/conda-forge/tk-feedstock/pull/70
+sed -i.bak '/^Requires\.private/d' ${PREFIX}/lib/pkgconfig/tcl.pc
+rm -f ${PREFIX}/lib/pkgconfig/tcl.pc.bak
+sed -i.bak '/^Libs\.private/d' ${PREFIX}/lib/pkgconfig/tcl.pc
+rm -f ${PREFIX}/lib/pkgconfig/tcl.pc.bak
+if [[ "${CONDA_BUILD_CROSS_COMPILATION}" == "1" ]]; then
+  sed -i.bak '/^Requires\.private/d' ${BUILD_PREFIX}/lib/pkgconfig/tcl.pc
+  rm -f ${BUILD_PREFIX}/lib/pkgconfig/tcl.pc.bak
+  sed -i.bak '/^Libs\.private/d' ${BUILD_PREFIX}/lib/pkgconfig/tcl.pc
+  rm -f ${BUILD_PREFIX}/lib/pkgconfig/tcl.pc.bak
+fi
+
 # The LTO/PGO information was sourced from @pitrou and the Debian rules file in:
 # http://http.debian.net/debian/pool/main/p/python3.6/python3.6_3.6.2-2.debian.tar.xz
 # https://packages.debian.org/source/sid/python3.6

recipe/meta.yaml

@@ -4,7 +4,7 @@
 {% set ver2 = '.'.join(version.split('.')[0:2]) %}
 {% set ver2nd = ''.join(version.split('.')[0:2]) %}
 {% set ver3nd = ''.join(version.split('.')[0:3]) %}
-{% set build_number = 2 %}
+{% set build_number = 3 %}
 
 # this makes the linter happy
 {% set channel_targets = channel_targets or 'conda-forge main' %}
@@ -78,6 +78,11 @@ source:
       - patches/0024-Do-not-define-pid_t-as-it-might-conflict-with-the-ac.patch
       - patches/0025-Unvendor-zstd.patch
 
+      # zlib-ng for all platforms
+      - patches/0026-Adjust-windows-project-for-zlib-ng.patch
+      - patches/0027-Use-zlib-ng-on-unix-instead-of-zlib.patch
+      - patches/0028-Update-usage-of-zlib-to-explicitely-use-zlib-ng.patch
+
 build:
   number: {{ build_number }}
 
@@ -163,7 +168,7 @@ outputs:
         - bzip2          # [build_platform != target_platform]
         - libsqlite      # [build_platform != target_platform]
         - liblzma-devel  # [build_platform != target_platform]
-        - zlib           # [build_platform != target_platform]
+        - zlib-ng        # [build_platform != target_platform]
         - zstd           # [build_platform != target_platform]
         - openssl        # [build_platform != target_platform]
         - readline       # [not win and build_platform != target_platform]
@@ -177,7 +182,7 @@ outputs:
         - bzip2
         - libsqlite
         - liblzma-devel
-        - zlib
+        - zlib-ng
         - zstd
         - openssl
         - readline  # [not win]

recipe/patches/0026-Adjust-windows-project-for-zlib-ng.patch

@@ -0,0 +1,43 @@
+From 4f2f508e468c1c6a58d3dec71f11de03ce23df8d Mon Sep 17 00:00:00 2001
+From: Mark Harfouche <mark.harfouche@gmail.com>
+Date: Sat, 1 Nov 2025 17:00:02 -0400
+Subject: [PATCH 26/28] Adjust windows project for zlib-ng
+
+---
+ PCbuild/pythoncore.vcxproj | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
+index fc1a607..82909cc 100644
+--- a/PCbuild/pythoncore.vcxproj
++++ b/PCbuild/pythoncore.vcxproj
+@@ -82,7 +82,7 @@
+   <PropertyGroup>
+     <KillPython>true</KillPython>
+     <RequireProfileData>true</RequireProfileData>
+-    <IncludeExternals Condition="$(IncludeExternals) == '' and Exists('$(condaDir)\include\zlib.h')">true</IncludeExternals>
++    <IncludeExternals Condition="$(IncludeExternals) == '' and Exists('$(condaDir)\include\zlib-ng.h')">true</IncludeExternals>
+     <IncludeExternals Condition="$(IncludeExternals) == ''">false</IncludeExternals>
+   </PropertyGroup>
+   <ImportGroup Label="PropertySheets">
+@@ -103,7 +103,7 @@
+       <AdditionalIncludeDirectories>$(PySourcePath)Modules\_hacl;$(PySourcePath)Modules\_hacl\include;$(PySourcePath)Python;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+       <AdditionalIncludeDirectories Condition="$(IncludeExternals)">$(condaDir)\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+       <AdditionalIncludeDirectories Condition="'$(UseJIT)' == 'true'">$(GeneratedJitStencilsDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+-      <PreprocessorDefinitions>_USRDLL;Py_BUILD_CORE;Py_BUILD_CORE_BUILTIN;Py_ENABLE_SHARED;MS_DLL_ID="$(SysWinVer)";ZLIB_COMPAT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
++      <PreprocessorDefinitions>_USRDLL;Py_BUILD_CORE;Py_BUILD_CORE_BUILTIN;Py_ENABLE_SHARED;MS_DLL_ID="$(SysWinVer)";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+       <PreprocessorDefinitions Condition="$(IncludeExternals)">_Py_HAVE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+       <PreprocessorDefinitions Condition="'$(UseJIT)' == 'true'">_Py_JIT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+       <PreprocessorDefinitions Condition="'$(UseTIER2)' != '' and '$(UseTIER2)' != '0'">_Py_TIER2=$(UseTIER2);%(PreprocessorDefinitions)</PreprocessorDefinitions>
+@@ -112,7 +112,7 @@
+       <PreprocessorDefinitions Condition="'$(DisableRemoteDebug)' != 'true'">Py_REMOTE_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+     </ClCompile>
+     <Link>
+-      <AdditionalDependencies>version.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;zlib.lib;%(AdditionalDependencies)</AdditionalDependencies>
++      <AdditionalDependencies>version.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;zlib-ng.lib;%(AdditionalDependencies)</AdditionalDependencies>
+       <AdditionalLibraryDirectories>$(condaDir)\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+     </Link>
+   </ItemDefinitionGroup>
+-- 
+2.51.0
+