Segmentation fault when running c extension on macOS

[SenhuiGuo]

BPO	36767
Nosy	@ronaldoussoren, @taleinat, @ned-deily

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-08-05.10:06:02.821>
created_at = <Date 2019-05-01.13:49:57.063>
labels = ['OS-mac', '3.7', 'invalid', 'type-crash']
title = 'Segmentation fault when running c extension on macOS'
updated_at = <Date 2019-08-05.10:06:02.814>
user = 'https://bugs.python.org/SenhuiGuo'

bugs.python.org fields:

activity = <Date 2019-08-05.10:06:02.814>
actor = 'taleinat'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-05.10:06:02.821>
closer = 'taleinat'
components = ['macOS']
creation = <Date 2019-05-01.13:49:57.063>
creator = 'Senhui Guo'
dependencies = []
files = []
hgrepos = []
issue_num = 36767
keywords = []
message_count = 3.0
messages = ['341196', '341200', '349043']
nosy_count = 4.0
nosy_names = ['ronaldoussoren', 'taleinat', 'ned.deily', 'Senhui Guo']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue36767'
versions = ['Python 3.7']

[SenhuiGuo]

I was trying to build a c extension with cpython while it keeps crashing when I get it running, the code is quite simple:

#include "Python.h"

int main ()
{
    PyObject *p;
    p = PySet_New(NULL);
}

I build with command clang -I/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/include/python3.7m -L/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin -lpython3.7m test.c -o run
when I ran it ./run, segmentation fault: 11 kicks in
However, if I go with python2, it worked fine:
clang -I /usr/local/Cellar/python\@2/2.7.16/Frameworks/Python.framework/Versions/2.7/include/python2.7 -L /usr/local/opt/python\@2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config/ -lpython2.7 test.c -o run

I was wondering if it is the problem with macOS? I tried build python from source, but didn't work, keeps crashing

[ronaldoussoren]

The program you include in your report will crash because the interpreter is never initialised.

See the embedding documentation for more information: https://docs.python.org/3/extending/embedding.html

[taleinat]

I'm closing this: It has had no followup in over 3 months, and seems to be a simple misuse of the C API rather than a bug.