From: Shamil <ashm.tech@proton.me>
Date: Sat, 6 Jun 2026 07:19:49 +0000 (+0300)
Subject: gh-148832: Use `-icf=0` in BOLT_APPLY_FLAGS (gh-148833)
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=2452449b32a768cc088a110fd95390acb5e27f83;p=thirdparty%2FPython%2Fcpython.git

gh-148832: Use `-icf=0` in BOLT_APPLY_FLAGS (gh-148833)
---

diff --git a/Misc/NEWS.d/next/Build/2026-04-21-17-27-52.gh-issue-148832.Kx9aQ1.rst b/Misc/NEWS.d/next/Build/2026-04-21-17-27-52.gh-issue-148832.Kx9aQ1.rst
new file mode 100644
index 000000000000..867cfcc5ab62
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-04-21-17-27-52.gh-issue-148832.Kx9aQ1.rst
@@ -0,0 +1,4 @@
+Fix :option:`--enable-bolt` build by switching the default BOLT flag from
+``-icf=1`` to ``-icf=0``. ``-icf=1`` folds address-taken functions and
+breaks type-slot dispatch, crashing on :mod:`list` and :mod:`tuple`
+concatenation. Patched by Shamil Abdulaev.
diff --git a/configure b/configure
index eb53b200bf78..67e5b3e46828 100755
--- a/configure
+++ b/configure
@@ -9593,7 +9593,7 @@ printf "%s\n" "$BOLT_INSTRUMENT_FLAGS" >&6; }
 printf %s "checking BOLT_APPLY_FLAGS... " >&6; }
 if test -z "${BOLT_APPLY_FLAGS}"
 then
-  BOLT_APPLY_FLAGS=" ${BOLT_COMMON_FLAGS} -reorder-blocks=ext-tsp -reorder-functions=cdsort -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot "
+  BOLT_APPLY_FLAGS=" ${BOLT_COMMON_FLAGS} -reorder-blocks=ext-tsp -reorder-functions=cdsort -split-functions -icf=0 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot "
 
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $BOLT_APPLY_FLAGS" >&5
diff --git a/configure.ac b/configure.ac
index b2f3f7210050..cdff5ec78a5f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2255,7 +2255,7 @@ then
      -reorder-blocks=ext-tsp
      -reorder-functions=cdsort
      -split-functions
-     -icf=1
+     -icf=0
      -inline-all
      -split-eh
      -reorder-functions-use-hot-size