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[3.12]extern "C" not closed in tracemalloc.h when using Py_LIMITED_API #127902

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3.12only security fixestype-bugAn unexpected behavior, bug, or error
@mitya57

Description

@mitya57

Bug report

Bug description:

When building PyQt6 with the latest 3.12 branch, I get the following error:

g++ -c -pipe -g -O2 -ffile-prefix-map=/pyqt6=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -O2 -fno-exceptions -Wall -Wextra -D_REENTRANT -fPIC -DPy_LIMITED_API=0x03090000 -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_CORE_LIB -I. -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/python3.12 -I/usr/include/x86_64-linux-gnu/qt6 -I/usr/include/x86_64-linux-gnu/qt6/QtCore -I. -I/usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -o dbus.o ../../../../dbus/dbus.cppIn file included from /usr/include/c++/14/utility:68,                 from /usr/include/x86_64-linux-gnu/qt6/QtCore/qglobal.h:15,                 from /usr/include/x86_64-linux-gnu/qt6/QtCore/qcoreapplication.h:7,                 from /usr/include/x86_64-linux-gnu/qt6/QtCore/QCoreApplication:1,                 from ../../../../dbus/dbus.cpp:29:/usr/include/c++/14/bits/stl_relops.h:86:5: error: template with C linkage   86 |     template <class _Tp>      |     ^~~~~~~~In file included from /usr/include/python3.12/Python.h:107,                 from /usr/include/dbus-1.0/dbus/dbus-python.h:34,                 from ../../../../dbus/dbus.cpp:27:/usr/include/python3.12/tracemalloc.h:4:1: note: ‘extern "C"’ linkage started here    4 | extern "C" {      | ^~~~~~~~~~

This happened because of the commit65bca19, which changed the structure oftracemalloc.h to the following:

#ifndef Py_TRACEMALLOC_H#definePy_TRACEMALLOC_H#ifdef __cplusplusextern"C" {#endif#ifndef Py_LIMITED_API/* ...*/#ifdef __cplusplus}#endif#endif/* !Py_LIMITED_API*/#endif/* !Py_TRACEMALLOC_H*/

Here, ifPy_LIMITED_API is defined, theextern "C" block is opened but never closed.

This problem does not affect 3.13 and newer versions, because the order is different there. I am going to submit a trivial pull request to fix this.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

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    3.12only security fixestype-bugAn unexpected behavior, bug, or error

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