[package] gettext/0.26: build fails on arch linux

[vehlwn]

Description

gettext is a transitive dependency of opencv so I cannot use opencv or any other package that dependes on gettext.

Package and Environment Details

• Package Name/Version: gettext/0.26
• Operating System+version: Arch Linux
• Compiler+version: GCC 15.2.1
• Conan version: conan 2.26.1
• Python version: Python 3.14.3

Conan profile

Host profile:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=23
compiler.libcxx=libstdc++11
compiler.version=15
os=Linux
[conf]

Build profile:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=23
compiler.libcxx=libstdc++11
compiler.version=15
os=Linux
[conf]

Steps to reproduce

$ cat conanfile.txt
[requires]
opencv/4.12.0

[generators]
PkgConfigDeps
MesonToolchain

$ cat meson.build
project('mre', 'cpp')
opencv_dep = dependency('opencv', include_type: 'system')
executable('a', 'main.cpp', dependencies: opencv_dep)

$ cat main.cpp
#include <iostream>
#include <opencv2/core.hpp>

int main() {
  const auto A = cv::Mat::eye(5, 5, CV_32F);
  const auto B = cv::Mat(5, 5, CV_32F, cv::Scalar(42));
  std::cout << A << '\n';
  std::cout << B << '\n';
  std::cout << A + B << '\n';
}

Logs

I get the same error from multiple gettext source files:

In file included from /usr/include/features.h:540,
                 from /usr/include/uchar.h:26,
                 from ./uchar.h:45,
                 from /home/qeq/.conan2/p/b/gette3b75e2bb2be86/b/src/gettext-runtime/intl/gnulib-lib/c32isalpha.c:21:
./wchar.h:856:23: error: expected identifier or '(' before '_Generic'
  856 | _GL_EXTERN_C wchar_t *wmemchr (const wchar_t *__s, wchar_t __wc, size_t __n)

I think it has something to do with glibc version because on Ubuntu 24.04 it works fine:

• Arch: ldd (GNU libc) 2.43
• Ubuntu: ldd (Ubuntu GLIBC 2.39-0ubuntu8.7) 2.39

[vehlwn]

I found related forum threads: https://lists.opensuse.org/archives/list/bugs@lists.opensuse.org/thread/FUQPFDWOE4FO5L3QT4FD3FT5TZQSRKND/