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Enable MSVC conforming preprocessor

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Switch MSVC to use the conforming preprocessor, using the
/Zc:preprocessor option.

This allows us to drop the alternative implementation of
VA_ARGS_NARGS() for the previous "traditional" preprocessor.

This also prepares the way for enabling C11 mode in the future, which
enables the conforming preprocessor by default.

This now requires Visual Studio 2019.  The installation documentation
is adjusted accordingly.

Discussion: https://www.postgresql.org/message-id/flat/01a69441-af54-4822-891b-ca28e05b215a%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2025-07-01 09:36:33 +02:00
parent 732061150b
commit 8fd9bb1d96
3 changed files with 6 additions and 25 deletions
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8
doc/src/sgml/installation.sgml
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@ -3847,17 +3847,13 @@ make: *** [postgres] Error 1
<para>
Both 32-bit and 64-bit builds are possible with the Microsoft Compiler suite.
32-bit PostgreSQL builds are possible with
<productname>Visual Studio 2015</productname> to
<productname>Visual Studio 2019</productname> to
<productname>Visual Studio 2022</productname>,
as well as standalone Windows SDK releases 10 and above.
64-bit PostgreSQL builds are supported with
<productname>Microsoft Windows SDK</productname> version 10 and above or
<productname>Visual Studio 2015</productname> and above.
<productname>Visual Studio 2019</productname> and above.
<!--
For 2015 requirements:
https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2015-sysrequirements-vs
For 2017 requirements:
https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2017-system-requirements-vs
For 2019 requirements:
https://docs.microsoft.com/en-us/visualstudio/releases/2019/system-requirements
For 2022 requirements: