port 2P step 1: vendor CPython 2.7.18 as the mtpython static library

The embedded 40250 script layer needs its own interpreter on five platforms. 2.7 is end-of-life, so nothing can be fetched from the target SDKs and the source is vendored (official 2.7.18 tarball, trimmed to 25MB; Lib/ stays for step 3's python27.zip). cpython-2.7.18/CMakeLists.txt builds one `mtpython` static library from exactly the 133 objects the reference libpython2.7.a contains, off by default behind -DMTGODOT_EMBED_PYTHON=ON. The source list and the built-in module table (config/config.c, 39 entries) are shared; pyconfig.h is a probe result and is not, so each platform keeps its own under config/<platform>/, regenerated by tools/py_embed/gen_pyconfig.sh and checked against the shared table. Three vendor patches, documented in docs/THIRD-PARTY.md: configure/configure.ac learn arm64 on macOS, and posixmodule.c undefines the process-control calls it hard-defines past pyconfig.h when building for iOS. macOS (ctest python.embed: every builtin imports, codecs and pickle work off the vendored Lib/), Android arm64 and iOS arm64 build. Linux needs a Linux host and Windows needs a MinGW-vs-MSVC decision; both are noted for step 4. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-23 08:27:35 +09:00
parent a9b31dec67
commit 5fad769ee8
1018 changed files with 652582 additions and 19 deletions
@@ -0,0 +1,60 @@
+#include "Python.h"
+#include "osdefs.h"
+
+static char *prefix, *exec_prefix, *progpath, *module_search_path=NULL;
+
+static void
+calculate_path()
+{
+    char *pypath = getenv("Python$Path");
+    if (pypath) {
+        int pathlen = strlen(pypath);
+        module_search_path = malloc(pathlen + 1);
+        if (module_search_path)
+            strncpy(module_search_path, pypath, pathlen + 1);
+        else {
+            fprintf(stderr,
+                "Not enough memory for dynamic PYTHONPATH.\n"
+                "Using default static PYTHONPATH.\n");
+        }
+    }
+    if (!module_search_path)
+        module_search_path = "<Python$Dir>.Lib";
+    prefix = "<Python$Dir>";
+    exec_prefix = prefix;
+    progpath = Py_GetProgramName();
+}
+
+/* External interface */
+
+char *
+Py_GetPath()
+{
+    if (!module_search_path)
+        calculate_path();
+    return module_search_path;
+}
+
+char *
+Py_GetPrefix()
+{
+    if (!module_search_path)
+        calculate_path();
+    return prefix;
+}
+
+char *
+Py_GetExecPrefix()
+{
+    if (!module_search_path)
+        calculate_path();
+    return exec_prefix;
+}
+
+char *
+Py_GetProgramFullPath()
+{
+    if (!module_search_path)
+        calculate_path();
+    return progpath;
+}