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bpo-43052: Make dyld search work with SYSTEM_VERSION_COMPAT=1 #24324

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bpo-43052: Make dyld search work with SYSTEM_VERSION_COMPAT=1 #24324

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Make dyld search work with SYSTEM_VERSION_COMPAT=1
isuruf Jan 25, 2021
519a9dc
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 28, 2021
ef58487
fix HAVE_PWRITEV_RUNTIME too
isuruf Jan 28, 2021
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Make dyld search work with SYSTEM_VERSION_COMPAT=1 
In macOS Big Sur, if the executable was compiled with `MACOSX_DEPLOYMENT_TARGET=10.15`
or below, then SYSTEM_VERSION_COMPAT=1 is the default which means that Big Sur
reports itself as 10.16 which means that `__builtin_available(macOS 11.0)` will not be triggered.

This can be observed by using the python 3.9.1 universal2 installer and using it on
x86_64 Big Sur or with Rossetta 2 on arm64 Big Sur. (Not an issue with native arm64
as that part is compiled with `MACOSX_DEPLOYMENT_TARGET=11.0`)
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@isuruf
isuruf authored Jan 25, 2021
commit afddfa8176cf8969055c6319504069b250723d3d
2 changes: 1 addition & 1 deletion Modules/_ctypes/callproc.c
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Expand Up @@ -1449,7 +1449,7 @@ static PyObject *py_dyld_shared_cache_contains_path(PyObject *self, PyObject *ar
PyObject *name, *name2;
char *name_str;

if (__builtin_available(macOS 11.0, iOS 14.0, tvOS 14.0, watchOS 7.0, *)) {
if (__builtin_available(macOS 10.16, iOS 14.0, tvOS 14.0, watchOS 7.0, *)) {
int r;

if (!PyArg_ParseTuple(args, "O", &name))
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