[InterNetNews/inn] a8feac: Make a warning specific to Clang

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: a8feaca53506300579f21b2fb1b03ca425d0a362
      https://github.com/InterNetNews/inn/commit/a8feaca53506300579f21b2fb1b03ca425d0a362
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2026-06-12 (Fri, 12 Jun 2026)

  Changed paths:
    M MANIFEST
    M configure.ac
    M m4/cc-flags.m4
    A m4/clang.m4
    M support/getrra-c-util

  Log Message:
  -----------
  Make a warning specific to Clang

Use clang.m4 from rra-c-util for Clang detection.

One warning made the build fail with GCC:
cc1: error: command-line option ‘-Wno-nrvo’ is valid
for C++/ObjC++ but not for C [-Werror]

Only use it when building with Clang.



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