[python3] Fix compilation of built-in modules on older versions of GCC (#27201)

ports/python3/0012-gcc-ldflags-fix.patch

@@ -0,0 +1,42 @@
+diff --git a/Lib/distutils/unixccompiler.py b/Lib/distutils/unixccompiler.py
+index d00c48981e..b14ce8454e 100644
+--- a/Lib/distutils/unixccompiler.py
++++ b/Lib/distutils/unixccompiler.py
+@@ -13,7 +13,7 @@
+   * link shared library handled by 'cc -shared'
+ """
+ 
+-import os, sys, re
++import os, sys, re, shutil
+ 
+ from distutils import sysconfig
+ from distutils.dep_util import newer
+@@ -216,7 +216,27 @@ def library_dir_option(self, dir):
+ 
+     def _is_gcc(self, compiler_name):
+         # clang uses same syntax for rpath as gcc
+-        return any(name in compiler_name for name in ("gcc", "g++", "clang"))
++        valid_compiler_names = ("gcc", "g++", "clang")
++        is_gcc = any(name in compiler_name for name in valid_compiler_names)
++        # On Linux systems, the compiler name may be, e.g., "cc -pthread".
++        # The executable "cc" is in this case a symlink to the true compiler.
++        if not is_gcc and "cc" in compiler_name:
++            # We need to make sure that this is not another compiler with "cc"
++            # at the end of its name, like "icc". For this, it is checked
++            # whether "cc" is the first word, or separated by a space or path
++            # delimiter before the "cc" substring.
++            cc_string_location = compiler_name.find("cc")
++            if cc_string_location == 0 \
++                    or compiler_name[cc_string_location - 1] == ' ' \
++                    or compiler_name[cc_string_location - 1] == '/' \
++                    or compiler_name[cc_string_location - 1] == '\\':
++                cc_path = shutil.which("cc")
++                if cc_path is not None:
++                    real_compiler_path = os.path.realpath(cc_path)
++                    is_gcc = any(
++                        name in real_compiler_path \
++                        for name in valid_compiler_names)
++        return is_gcc
+ 
+     def runtime_library_dir_option(self, dir):
+         # XXX Hackish, at the very least.  See Python bug #445902:

ports/python3/portfile.cmake

@@ -20,6 +20,10 @@ set(PATCHES
 if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
     list(PREPEND PATCHES 0001-static-library.patch)
 endif()
+# Fix build failures with GCC for built-in modules (https://github.com/microsoft/vcpkg/issues/26573)
+if(VCPKG_CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    list(APPEND PATCHES 0012-gcc-ldflags-fix.patch)
+endif()
 
 # Python 3.9 removed support for Windows 7. This patch re-adds support for Windows 7 and is therefore
 # required to build this port on Windows 7 itself due to Python using itself in its own build system.

ports/python3/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "python3",
   "version": "3.10.5",
-  "port-version": 3,
+  "port-version": 4,
   "description": "The Python programming language",
   "homepage": "https://github.com/python/cpython",
   "license": "Python-2.0",

versions/baseline.json

@@ -5942,7 +5942,7 @@
     },
     "python3": {
       "baseline": "3.10.5",
-      "port-version": 3
+      "port-version": 4
     },
     "qca": {
       "baseline": "2.3.4",

versions/p-/python3.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "a6bf44809eee3bfbce1b176e55d41beb54cac6f2",
+      "version": "3.10.5",
+      "port-version": 4
+    },
     {
       "git-tree": "03352a9860cce420c7bc069e1f62f5b1a19226ef",
       "version": "3.10.5",