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 +1,114 @@
+
+/* Support for dynamic loading of extension modules on Mac OS X
+** All references to "NeXT" are for historical reasons.
+*/
+
+#include "Python.h"
+#include "importdl.h"
+
+#include <mach-o/dyld.h>
+
+const struct filedescr _PyImport_DynLoadFiletab[] = {
+    {".so", "rb", C_EXTENSION},
+    {"module.so", "rb", C_EXTENSION},
+    {0, 0}
+};
+
+/*
+** Python modules are Mach-O MH_BUNDLE files. The best way to load these
+** is each in a private namespace, so you can load, say, a module bar and a
+** module foo.bar. If we load everything in the global namespace the two
+** initbar() symbols will conflict.
+** However, it seems some extension packages depend upon being able to access
+** each others' global symbols. There seems to be no way to eat our cake and
+** have it, so the USE_DYLD_GLOBAL_NAMESPACE define determines which behaviour
+** you get.
+*/
+
+#ifdef USE_DYLD_GLOBAL_NAMESPACE
+#define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR
+#else
+#define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \
+    NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE
+#endif
+dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
+                                        const char *pathname, FILE *fp)
+{
+    dl_funcptr p = NULL;
+    char funcname[258];
+    NSObjectFileImageReturnCode rc;
+    NSObjectFileImage image;
+    NSModule newModule;
+    NSSymbol theSym;
+    const char *errString;
+    char errBuf[512];
+
+    PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname);
+
+#ifdef USE_DYLD_GLOBAL_NAMESPACE
+    if (NSIsSymbolNameDefined(funcname)) {
+        theSym = NSLookupAndBindSymbol(funcname);
+        p = (dl_funcptr)NSAddressOfSymbol(theSym);
+        return p;
+    }
+#endif
+    rc = NSCreateObjectFileImageFromFile(pathname, &image);
+    switch(rc) {
+        default:
+        case NSObjectFileImageFailure:
+        case NSObjectFileImageFormat:
+            /* for these a message is printed on stderr by dyld */
+            errString = "Can't create object file image";
+        break;
+        case NSObjectFileImageSuccess:
+            errString = NULL;
+            break;
+        case NSObjectFileImageInappropriateFile:
+            errString = "Inappropriate file type for dynamic loading";
+            break;
+        case NSObjectFileImageArch:
+            errString = "Wrong CPU type in object file";
+            break;
+        case NSObjectFileImageAccess:
+            errString = "Can't read object file (no access)";
+            break;
+    }
+    if (errString == NULL) {
+        newModule = NSLinkModule(image, pathname, LINKOPTIONS);
+        if (newModule == NULL) {
+            int errNo;
+            const char *fileName, *moreErrorStr;
+            NSLinkEditErrors c;
+            NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr );
+            PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s",
+                            fileName, moreErrorStr);
+            errString = errBuf;
+        }
+    }
+    if (errString != NULL) {
+        PyErr_SetString(PyExc_ImportError, errString);
+        return NULL;
+    }
+#ifdef USE_DYLD_GLOBAL_NAMESPACE
+    if (!NSIsSymbolNameDefined(funcname)) {
+        /* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
+        /* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */
+        PyErr_Format(PyExc_ImportError,
+                         "Loaded module does not contain symbol %.200s",
+                         funcname);
+        return NULL;
+    }
+    theSym = NSLookupAndBindSymbol(funcname);
+#else
+    theSym = NSLookupSymbolInModule(newModule, funcname);
+    if ( theSym == NULL ) {
+        /* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */
+        PyErr_Format(PyExc_ImportError,
+                         "Loaded module does not contain symbol %.200s",
+                         funcname);
+        return NULL;
+    }
+#endif
+    p = (dl_funcptr)NSAddressOfSymbol(theSym);
+    return p;
+}