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Re: Make copyObject work in C++

Peter Eisentraut <peter@eisentraut.org>

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From: Peter Eisentraut <peter@eisentraut.org>
To: Jelte Fennema-Nio <postgres@jeltef.nl>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Thomas Munro <thomas.munro@gmail.com>, Andres Freund <andres@anarazel.de>
Date: 2026-02-17T09:24:42Z
Lists: pgsql-hackers 
On 13.02.26 11:28, Jelte Fennema-Nio wrote:
> On Sun Jan 25, 2026 at 9:06 PM CET, Andres Freund wrote:
>> Named args make that easier in two ways: First, only extensions using the
>> to-be-removed option will fail. Second, removal of options reliably 
>> generates
>> errors, rather than bogusly use one field for another, just because 
>> the types
>> are compatible.
> 
> After discussing the topic in-person with Peter at FOSDEM. We agreed
> that the best road forward was to not bother with MSVC for now. No-one
> has actually expressed an interest in being able to build C++ extension
> using MSVC, and the effort to support it is both non-trivial and not
> without downsides to the rest of the codebase. We can always come back
> to this later, possibly requiring C++20 on MSVC.
> 
> So I've removed that patch and now this patchset its goal is to improve
> compatibiltity with the C++ flavor of GCC and Clang.
> 
> Patch 1 and 2 add some more macro calls to our test C++ extension. These
> macros already work in GCC and Clang, this is purely to test for future
> regressinos.

I have committed these two.  I'll give them some time on the buildfarm 
and then look at the rest.

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Enable test_cplusplusext with MSVC

  2. Disable some C++ warnings in MSVC

  3. meson: Make room for C++-only warning flags for MSVC

  4. Make fixed-length list building macros work in C++

  5. Make unconstify and unvolatize use StaticAssertVariableIsOfTypeMacro

  6. Use typeof everywhere instead of compiler specific spellings

  7. Test List macros in C++ extensions

  8. Test most StaticAssert macros in C++ extensions

  9. Revert "Change copyObject() to use typeof_unqual"

  10. Fix for C++ compatibility

  11. tests: Add a test C++ extension module