[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset 8487ef61dea9fb0579f0be8f01d74fa20d3b8ed1 by Benjamin Peterson in 
branch '3.6':
[3.6] bpo-34121: Fix detection of C11 atomic support on clang. (GH-8290)
https://github.com/python/cpython/commit/8487ef61dea9fb0579f0be8f01d74fa20d3b8ed1


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[issue34121] configure fails to detect C11 atomic support on clang

[miss-islington]

miss-islington  added the comment:


New changeset 3fc12f0e2ad9ba49243f5a43a8803018b2ff5904 by Miss Islington (bot) 
in branch '3.7':
bpo-34121: Fix detection of C11 atomic support on clang. (GH-8288)
https://github.com/python/cpython/commit/3fc12f0e2ad9ba49243f5a43a8803018b2ff5904


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[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

Change by Benjamin Peterson :


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

Change by Benjamin Peterson :


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[issue34121] configure fails to detect C11 atomic support on clang

[miss-islington]

Change by miss-islington :


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[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset 15c7b2abdfb93f8902dd72474818aee2bf97fa66 by Benjamin Peterson in 
branch 'master':
bpo-34121: Fix detection of C11 atomic support on clang. (GH-8288)
https://github.com/python/cpython/commit/15c7b2abdfb93f8902dd72474818aee2bf97fa66


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[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

Change by Benjamin Peterson :


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stage:  -> patch review

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[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

Change by Benjamin Peterson :


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components: +Build -Interpreter Core

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[issue34121] configure fails to detect C11 atomic support on clang

[Benjamin Peterson]

New submission from Benjamin Peterson :

clang supports C11 atomic APIs just fine but Python's configure fails to detect 
it:

configure:16529: checking for stdatomic.h
configure:16545: clang -pthread -o conftestconftest.c -lpthread -ldl  
-lutil >&5
conftest.c:389:5: error: _Atomic cannot be applied to incomplete type 'void' 
_Atomic void *py_atomic_address = (void*) 
^
1 error generated.

Indeed, the atomic uninhabited type is not very useful. If we wanted an atomic 
pointer, we should write _Atomic(void *).

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components: Interpreter Core
messages: 321697
nosy: benjamin.peterson
priority: normal
severity: normal
status: open
title: configure fails to detect C11 atomic support on clang
versions: Python 3.6, Python 3.7, Python 3.8

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