https://github.com/python/cpython/commit/6839f8ce22e54cffdaa9d8fe40009b7964450b69
commit: 6839f8ce22e54cffdaa9d8fe40009b7964450b69
branch: main
author: Advit Arora <[email protected]>
committer: freakboy3742 <[email protected]>
date: 2026-10-21T15:13:36-07:00
summary:
gh-155813: Stop overwriting LIBFFI_CFLAGS and LIBFFI_LIBS on macOS (#156486)
Ensures that a user-specified LIBFFI_CFLAGS and LIBFFI_LIBS is honored when
building on macOS.
files:
A Misc/NEWS.d/next/Build/2026-08-27-23-24-29.gh-issue-155813.LxRQu9.rst
M configure
M configure.ac
diff --git
a/Misc/NEWS.d/next/Build/2026-08-27-23-24-29.gh-issue-155813.LxRQu9.rst
b/Misc/NEWS.d/next/Build/2026-08-27-23-24-29.gh-issue-155813.LxRQu9.rst
new file mode 100644
index 00000000000000..c614826ba4c19a
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-08-27-23-24-29.gh-issue-155813.LxRQu9.rst
@@ -0,0 +1,3 @@
+On macOS, :option:`LIBFFI_CFLAGS` and :option:`LIBFFI_LIBS` are no longer
+ignored when the SDK provides ``libffi``, so :mod:`ctypes` can again be built
+against a different ``libffi``. Patch by Advit Arora.
diff --git a/configure b/configure
index ce630035cb053a..4c9059f18d8326 100755
--- a/configure
+++ b/configure
@@ -16332,8 +16332,8 @@ if test "x$ac_cv_lib_ffi_ffi_call" = xyes
then :
have_libffi=yes
- LIBFFI_CFLAGS="-I${SDKROOT}/usr/include/ffi -DUSING_APPLE_OS_LIBFFI=1"
- LIBFFI_LIBS="-lffi"
+ LIBFFI_CFLAGS=${LIBFFI_CFLAGS-"-I${SDKROOT}/usr/include/ffi
-DUSING_APPLE_OS_LIBFFI=1"}
+ LIBFFI_LIBS=${LIBFFI_LIBS-"-lffi"}
fi
diff --git a/configure.ac b/configure.ac
index 51367b254c4590..463202793af8d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4418,8 +4418,8 @@ AS_VAR_IF([ac_sys_system], [Darwin], [
AC_CHECK_LIB([ffi], [ffi_call], [
dnl use ffi from SDK root
have_libffi=yes
- LIBFFI_CFLAGS="-I${SDKROOT}/usr/include/ffi -DUSING_APPLE_OS_LIBFFI=1"
- LIBFFI_LIBS="-lffi"
+ LIBFFI_CFLAGS=${LIBFFI_CFLAGS-"-I${SDKROOT}/usr/include/ffi
-DUSING_APPLE_OS_LIBFFI=1"}
+ LIBFFI_LIBS=${LIBFFI_LIBS-"-lffi"}
])
])
])
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