sip-build: Warnings with Wextra and clang

[Martyn Gigg - STFC UKRI]

Hi,

I’m using sip to generate some Python bindings to PyQt. Our build environment adds -Wextra to the compiler flags and this seems to generate warnings about missing field initializers when compiled with clang.

I have managed to reproduce this using the basic example at https://www.riverbankcomputing.com/static/Docs/sip/examples.html#a-standalone-project, adding

[tool.sip.bindings.fib]
extra-compile-args = ["-Wextra"]

to the pyproject.toml. Building this with `sip-build` on macOS with clang-13 produces the following warnings:

These bindings will be built: fib.
Generating the fib bindings...
Compiling the 'fib' module...
sip_core.c:182:9: warning: missing field 'am_send' initializer [-Wmissing-field-initializers]
        },
        ^
sip_core.c:258:1: warning: missing field 'wt_reserved' initializer [-Wmissing-field-initializers]
};
^
sip_core.c:9629:9: warning: missing field 'am_send' initializer [-Wmissing-field-initializers]
        },
        ^
sip_core.c:9705:1: warning: missing field 'wt_reserved' initializer [-Wmissing-field-initializers]
};
^
4 warnings generated.
sipfibcmodule.c:19:39: warning: unused parameter 'sipSelf' [-Wunused-parameter]
static PyObject *func_fib_n(PyObject *sipSelf,PyObject *sipArgs)
                                      ^
/Users/dmn58364/Code/git/martyngigg/sip-missing-field-error/build/fib/sipfibcmodule.c:84:1: warning: missing field 'em_exception_handler' initializer [-Wmissing-field-initializers]
};
^
2 warnings generated.
The project has been built.

I can disable the warnings in my code but could there be an underlying issue here?

Many thanks,

Martyn

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