gh-107279 Add <stddef.h> to Modules/zlibmodule.c to fix failing builds
#107280
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Recent CI builds are failing because the `offsetof` function in `Modules/zlibmodule.c` cannot be called. For example, see https://buildbot.python.org/all/#/builders/15/builds/5217/steps/4/logs/stdio from commit fabcbe9. Here is a relevant snippet from the stdio logs for step 4 compile: ``` ../Modules/zlibmodule.c:1802:21: error: implicit declaration of function ‘offsetof’ [-Werror=implicit-function-declaration] #define COMP_OFF(x) offsetof(compobject, x) ^~~~~~~~ ../Modules/zlibmodule.c:1804:39: note: in expansion of macro ‘COMP_OFF’ {"unused_data", _Py_T_OBJECT, COMP_OFF(unused_data), Py_READONLY}, ^~~~~~~~ ../Modules/zlibmodule.c:1802:21: note: ‘offsetof’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../Modules/zlibmodule.c:1776:1: +#include <stddef.h> ../Modules/zlibmodule.c:1802:21: #define COMP_OFF(x) offsetof(compobject, x) ^~~~~~~~ ../Modules/zlibmodule.c:1804:39: note: in expansion of macro ‘COMP_OFF’ {"unused_data", _Py_T_OBJECT, COMP_OFF(unused_data), Py_READONLY}, ^~~~~~~~ ../Modules/zlibmodule.c:1802:30: error: expected expression before ‘compobject’ #define COMP_OFF(x) offsetof(compobject, x) ^~~~~~~~~~ ```
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I think the |
kumaraditya303
approved these changes
Jul 27, 2023
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See the message in commit 733d38c for a quick overview.
Essentially, it looks like #106871 updated some internal C implementations, but missed adding
<stddef.h>to theModules/zlibmodule.cfile. I noticed this when looking at the output of the build after commit fabcbe9 was merged, and the following 2 commits (6a43cce and 2b1a81e) also failed with the same error.Interestingly, not all platforms seem to fail because of this omission. In commit 2b1a81e, for example:
This seems a odd to me, but I'm not familiar enough with the CI/build process to offer a suggestion for this discrepancy between platforms.
<stddef.h>toModules/zlibmodule.cto fix failing builds #107279