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python-cffi: fix cross-compilation on macOS hosts

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setup.py picks the macOS-only -iwithsysroot/usr/include/ffi flag from
sys.platform, which describes the interpreter running the build rather than
the target, so cross-compiling from a macOS host hands an Apple clang flag to
the GNU cross compiler and the build fails. Use sysconfig.get_platform(),
which honours the _PYTHON_HOST_PLATFORM that python3-package.mk exports.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
This commit is contained in:
Josef Schlehofer authored and Alexandru Ardelean committed 2026-08-09 20:12:05 +03:00
1 parent cba46226f6
commit 73b468c738
2 files changed
+42 -1
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lang/python/python-cffi/Makefile
+1 -1
View File
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=python-cffi
PKG_VERSION:=1.16.0
PKG_RELEASE:=1
PKG_RELEASE:=2
PYPI_NAME:=cffi
PKG_HASH:=bcb3ef43e58665bbda2fb198698fcae6776483e0c4a631aa5647806c25e02cc0
lang/python/python-cffi/patches/002-fix-cross-compilation-on-macos-hosts.patch
+41
View File
@@ -0,0 +1,41 @@
From 7a3b39e2fbbaa0511789a3231964f61f77fb28a9 Mon Sep 17 00:00:00 2001
From: Josef Schlehofer <pepe.schlehofer@gmail.com>
Date: Tue, 9 Jun 2026 04:33:35 +0000
Subject: [PATCH] setup.py: fix cross-compilation on macOS hosts
Backport of https://github.com/python-cffi/cffi/pull/247, merged upstream on
2026-06-09 and not yet in the 1.16.0 release OpenWrt 24.10 carries.
When cross-compiling for a non-macOS target (such as Linux) on a macOS host,
setup.py incorrectly detects the host platform as 'darwin' using sys.platform.
This adds the macOS-specific flag -iwithsysroot/usr/include/ffi to the compiler
arguments, which causes the cross-compiler to fail with:
powerpc-openwrt-linux-musl-gcc: error: unrecognized command-line option
'-iwithsysroot/usr/include/ffi'
By using sysconfig.get_platform().startswith('macosx') instead of 'darwin' in
sys.platform, we correctly check the target platform rather than the build host.
The import is part of the backport: upstream already imports sysconfig for
FREE_THREADED_BUILD, which 1.16.0 predates.
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
---
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-import sys, os, platform
+import sys, sysconfig, os, platform
import subprocess
import errno
@@ -148,7 +148,7 @@ else:
ask_supports_thread()
ask_supports_sync_synchronize()
-if 'darwin' in sys.platform:
+if sysconfig.get_platform().startswith('macosx'):
# priority is given to `pkg_config`, but always fall back on SDK's libffi.
extra_compile_args += ['-iwithsysroot/usr/include/ffi']