Link probe HAVE_LIBGCC_EH_FRAME_REGISTRATION

diegorusso · diegorusso · commit ef9ea52cc62a · 2026-05-03T01:46:12.000+01:00
diff --git a/Include/internal/pycore_jit_unwind.h b/Include/internal/pycore_jit_unwind.h
@@ -10,7 +10,8 @@
 
 #if defined(_Py_JIT) && defined(__linux__) && defined(__ELF__)
 #  define PY_HAVE_JIT_GDB_UNWIND
-#  if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE)
+#  if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE) && \
+          defined(HAVE_LIBGCC_EH_FRAME_REGISTRATION)
 #    define PY_HAVE_JIT_GNU_BACKTRACE_UNWIND
 #  endif
 #endif
diff --git a/configure b/configure
diff --git a/configure.ac b/configure.ac
@@ -3828,6 +3828,24 @@ AC_CHECK_HEADERS([execinfo.h link.h dlfcn.h], [
   ])
 ])
 
+dnl for JIT GNU backtrace unwind registration
+AC_CACHE_CHECK([for libgcc frame registration functions],
+  [ac_cv_have_libgcc_eh_frame_registration],
+  [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+void __register_frame(const void *);
+void __deregister_frame(const void *);
+]], [[
+__register_frame(0);
+__deregister_frame(0);
+]])],
+    [ac_cv_have_libgcc_eh_frame_registration=yes],
+    [ac_cv_have_libgcc_eh_frame_registration=no])
+  ])
+AS_VAR_IF([ac_cv_have_libgcc_eh_frame_registration], [yes], [
+  AC_DEFINE([HAVE_LIBGCC_EH_FRAME_REGISTRATION], [1],
+    [Define to 1 if libgcc __register_frame and __deregister_frame are linkable.])
+])
+
 dnl only add -ldl to LDFLAGS if it isn't already part of LIBS (GH-133081)
 AS_VAR_IF([ac_cv_require_ldl], [yes], [
   AS_VAR_IF([ac_cv_lib_dl_dlopen], [yes], [], [
diff --git a/pyconfig.h.in b/pyconfig.h.in
@@ -701,6 +701,10 @@
 /* Define to 1 if you have the 'dld' library (-ldld). */
 #undef HAVE_LIBDLD
 
+/* Define to 1 if libgcc __register_frame and __deregister_frame are linkable.
+   */
+#undef HAVE_LIBGCC_EH_FRAME_REGISTRATION
+
 /* Define to 1 if you have the 'ieee' library (-lieee). */
 #undef HAVE_LIBIEEE
 
