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python3: fix host python extension compilation on macOS

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On macOS (Darwin) hosts, building host Python C extensions (such as Cython) using the '-shared' flag and linking against '-lpython3.x' causes the host Python interpreter to load a duplicate copy of the Python runtime. This leads to type checking mismatches and segmentation faults (SIGSEGV) when importing the compiled extension.

For example, running:
    ./staging_dir/hostpkg/bin/python3 -c "import Cython.Utils"
crashes with:
    Segmentation fault: 11

To build shared modules correctly on macOS, they must be compiled as bundles using the '-bundle -undefined dynamic_lookup' flags instead of '-shared', and they should not link against the Python library (no '-lpython3.x' in LDFLAGS).

Fix this by dynamically adjusting LDSHARED and LDFLAGS in python3-host.mk when the host OS is Darwin.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
This commit is contained in:
Josef Schlehofer
2026-06-08 09:05:18 +02:00
committed by Alexandru Ardelean
parent d373e0ec7d
commit ea541f48b5
1 changed files with 2 additions and 2 deletions
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lang/python/python3-host.mk
+2 -2
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@@ -74,10 +74,10 @@ HOST_PYTHON3_VARS = \
CCSHARED="$(HOSTCC) $(HOST_FPIC)" \
CXX="$(HOSTCXX)" \
LD="$(HOSTCC)" \
LDSHARED="$(HOSTCC) -shared" \
LDSHARED="$(HOSTCC) $(if $(findstring Darwin,$(HOST_OS)),-bundle -undefined dynamic_lookup,-shared)" \
CFLAGS="$(HOST_CFLAGS)" \
CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON3_INC_DIR)" \
LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON3_VERSION)" \
LDFLAGS="$(HOST_LDFLAGS)$(if $(findstring Darwin,$(HOST_OS)),, -lpython$(PYTHON3_VERSION))" \
$(CARGO_HOST_CONFIG_VARS) \
SETUPTOOLS_RUST_CARGO_PROFILE="$(CARGO_HOST_PROFILE)"