[3.12] pythongh-128472: Add -skip-funcs to BOLT options to fix computed goto errors (pythongh-128511) (pythongh-128572)

pythongh-128472: Add `-skip-funcs` to BOLT options to fix computed goto errors (pythongh-128511)

* Add `-skip-funcs` to BOLT options to fix computed goto errors



* NEWS

---------

(cherry picked from commit 24b147a)

Co-authored-by: Zanie Blue <contact@zanie.dev>
Co-authored-by: Gregory Szorc <gregory.szorc@gmail.com>

Author: 3 people

Misc/NEWS.d/next/Build/2025-01-04-22-39-10.gh-issue-128472.Wt5E6M.rst

@@ -0,0 +1,2 @@
+Skip BOLT optimization of functions using computed gotos, fixing errors on
+build with LLVM 19.

configure

@@ -2114,7 +2114,14 @@ if test -z "${BOLT_COMMON_FLAGS}"
 then
   AS_VAR_SET(
     [BOLT_COMMON_FLAGS],
-    [-update-debug-sections]
+    [m4_normalize("
+      [-update-debug-sections]
+
+      dnl At least LLVM 19.x doesn't support computed gotos in PIC compiled code.
+      dnl Exclude functions containing computed gotos.
+      dnl TODO this may be fixed in LLVM 20.x via https://github.com/llvm/llvm-project/pull/120267.
+      [-skip-funcs=_PyEval_EvalFrameDefault,sre_ucs1_match/1,sre_ucs2_match/1,sre_ucs4_match/1]
+    ")]
   )
 fi