diff --git a/Lib/test/test_build_details.py b/Lib/test/test_build_details.py
index 30d9c213077ab75..52d66335752a558 100644
--- a/Lib/test/test_build_details.py
+++ b/Lib/test/test_build_details.py
@@ -2,6 +2,7 @@
 import json
 import os
 import os.path
+import shlex
 import sys
 import sysconfig
 import string
@@ -173,6 +174,13 @@ def test_c_api(self):
         version = sysconfig.get_config_var('VERSION')
         self.assertTrue(os.path.exists(os.path.join(value['pkgconfig_path'], f'python-{version}.pc')))
 
+    def test_extension_compiler_flags(self):
+        value = self.key('arbitrary_data.extension_compiler_flags')
+        expected = shlex.split(
+            sysconfig.get_config_var('FRAME_POINTER_CFLAGS') or ''
+        )
+        self.assertEqual(value, expected)
+
 
 @unittest.skipIf(
     generate_build_details is None,
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 46fa26e01572cc2..ca6214cc7f120b6 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -83,6 +83,7 @@ MAKESETUP=      $(srcdir)/Modules/makesetup
 # Compiler options
 OPT=		@OPT@
 BASECFLAGS=	@BASECFLAGS@
+FRAME_POINTER_CFLAGS=	@FRAME_POINTER_CFLAGS@
 BASECPPFLAGS=	@BASECPPFLAGS@
 CONFIGURE_CFLAGS=	@CFLAGS@
 # CFLAGS_NODIST is used for building the interpreter and stdlib C extensions.
diff --git a/Misc/NEWS.d/next/Build/2026-08-04-12-00-00.gh-issue-155170.abc123.rst b/Misc/NEWS.d/next/Build/2026-08-04-12-00-00.gh-issue-155170.abc123.rst
new file mode 100644
index 000000000000000..43bdf21c7245572
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-08-04-12-00-00.gh-issue-155170.abc123.rst
@@ -0,0 +1,2 @@
+Expose CPython's frame-pointer flags for extension builds in
+``build-details.json``.
diff --git a/PC/layout/support/builddetails.py b/PC/layout/support/builddetails.py
index 6ef860eeb043545..c273e42bcf0d99f 100644
--- a/PC/layout/support/builddetails.py
+++ b/PC/layout/support/builddetails.py
@@ -54,6 +54,9 @@
     },
     "c_api": {
     },
+    "arbitrary_data": {
+        "extension_compiler_flags": [],
+    },
 }
 
 
diff --git a/Tools/build/generate-build-details.py b/Tools/build/generate-build-details.py
index 8272635bc627d6a..bf44302e5e29a2a 100644
--- a/Tools/build/generate-build-details.py
+++ b/Tools/build/generate-build-details.py
@@ -10,6 +10,7 @@
 import importlib.machinery
 import json
 import os
+import shlex
 import sys
 import sysconfig
 
@@ -129,6 +130,11 @@ def generate_data(schema_version: str) -> collections.defaultdict[str, Any]:
     if LIBPC:
         data['c_api']['pkgconfig_path'] = LIBPC
 
+    frame_pointer_cflags = sysconfig.get_config_var('FRAME_POINTER_CFLAGS') or ''
+    data['arbitrary_data']['extension_compiler_flags'] = shlex.split(
+        frame_pointer_cflags
+    )
+
     return data
 
 
diff --git a/configure b/configure
index 836eb88e4cdb6e5..338795dec14b0b1 100755
--- a/configure
+++ b/configure
@@ -917,6 +917,7 @@ SHLIB_SUFFIX
 DSYMUTIL_PATH
 DSYMUTIL
 REGEN_JIT_COMMAND
+FRAME_POINTER_CFLAGS
 UNIVERSAL_ARCH_FLAGS
 WASM_STDLIB
 WASM_ASSETS_DIR
@@ -10494,6 +10495,8 @@ fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $with_frame_pointers" >&5
 printf "%s\n" "$with_frame_pointers" >&6; }
 
+
+FRAME_POINTER_CFLAGS=
 if test "x$ac_cv_gcc_compat" = xyes
 then :
 
@@ -10736,7 +10739,8 @@ esac
 fi
 
     if test -n "$frame_pointer_cflags" && test "x$with_frame_pointers" != xno; then
-      BASECFLAGS="$frame_pointer_cflags $BASECFLAGS"
+      FRAME_POINTER_CFLAGS="$frame_pointer_cflags"
+      BASECFLAGS="$FRAME_POINTER_CFLAGS $BASECFLAGS"
 
 printf "%s\n" "#define _Py_WITH_FRAME_POINTERS 1" >>confdefs.h
 
diff --git a/configure.ac b/configure.ac
index 3a9841b1e7d0747..a9e76d439129765 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2620,6 +2620,8 @@ AC_ARG_WITH([frame-pointers],
   [with_frame_pointers=yes])
 AC_MSG_RESULT([$with_frame_pointers])
 
+AC_SUBST([FRAME_POINTER_CFLAGS])
+FRAME_POINTER_CFLAGS=
 AS_VAR_IF([ac_cv_gcc_compat], [yes], [
     dnl Keep frame pointers in CPython, stdlib objects, and third-party
     dnl extensions built against this Python (BASECFLAGS propagates via
@@ -2651,7 +2653,8 @@ AS_VAR_IF([ac_cv_gcc_compat], [yes], [
       ])
     ], [], [-Werror])
     if test -n "$frame_pointer_cflags" && test "x$with_frame_pointers" != xno; then
-      BASECFLAGS="$frame_pointer_cflags $BASECFLAGS"
+      FRAME_POINTER_CFLAGS="$frame_pointer_cflags"
+      BASECFLAGS="$FRAME_POINTER_CFLAGS $BASECFLAGS"
       AC_DEFINE([_Py_WITH_FRAME_POINTERS], [1],
                 [Define to 1 if frame unwinding via pointers is expected
                  to work, 0 if not. Leave undefined if unknown.])