Reformat sysconfig

Author: charliermarsh

.github/workflows/apple.yml

@@ -45,10 +45,20 @@ jobs:
       fail-fast: false
       matrix:
         build:
+          - target_triple: 'aarch64-apple-darwin'
+            runner: macos-14
+            py: 'cpython-3.9'
+            options: 'debug'
+
+          - target_triple: 'aarch64-apple-darwin'
+            runner: macos-14
+            py: 'cpython-3.12'
+            options: 'debug'
+
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
             py: 'cpython-3.13'
-            options: 'freethreaded+debug'
+            options: 'debug'
     needs:
       - pythonbuild
     runs-on: ${{ matrix.build.runner }}

cpython-unix/build-cpython.sh

@@ -627,6 +627,33 @@ def replace_in_all(search, replace):
     replace_in_file(MAKEFILE, search, replace)
     replace_in_file(SYSCONFIGDATA, search, replace)
 
+
+def format_sysconfigdata():
+    """Reformat the sysconfigdata file to avoid implicit string concatenations.
+
+    In some Python versions, the sysconfigdata file contains implicit string
+    concatenations that extend over multiple lines, which make string replacement
+    much harder. This function reformats the file to avoid this issue.
+
+    See: https://github.com/python/cpython/blob/a03efb533a58fd13fb0cc7f4a5c02c8406a407bd/Mac/BuildScript/build-installer.py#L1360C1-L1385C15.
+    """
+    with open(SYSCONFIGDATA, "rb") as fh:
+        data = fh.read()
+
+    globals_dict = {}
+    locals_dict = {}
+    exec(data, globals_dict, locals_dict)
+    build_time_vars = l_dict['build_time_vars']
+
+    with open(SYSCONFIGDATA, "wb") as fh:
+        fh.write(b'# system configuration generated and used by the sysconfig module\n')
+        fh.write(('build_time_vars = %s' % json.dumps(build_time_vars, indent=4)).encode("utf-8"))
+        fh.close()
+
+
+# Format sysconfig to ensure that string replacements take effect.
+format_sysconfigdata()
+
 # Remove the Xcode path from the compiler flags.
 #
 # CPython itself will drop this from `sysconfig.get_config_var("CFLAGS")` and