From: Daniel Arndt <arndtd@ornl.gov>
Date: Mon, 20 Mar 2023 12:40:07 +0000 (-0400)
Subject: Use <version> header for C++20 feature checks
X-Git-Tag: v9.5.0-rc1~450^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15285822bea3bb937ff6de3fa794d80701754f0c;p=dealii.git

Use <version> header for C++20 feature checks
---

diff --git a/cmake/checks/check_01_cxx_features.cmake b/cmake/checks/check_01_cxx_features.cmake
index b6b9a0b28a..1fa2401dbc 100644
--- a/cmake/checks/check_01_cxx_features.cmake
+++ b/cmake/checks/check_01_cxx_features.cmake
@@ -70,8 +70,7 @@ macro(_test_cxx20_support)
   # Beyond this, check for some features we actually need.
   CHECK_CXX_SOURCE_COMPILES(
     "
-    #include <cmath>
-    #include <ranges>
+    #include <version>
 
     #if __cplusplus < 201709L && !defined(_MSC_VER) && !defined(__INTEL_COMPILER)
     #  error \"insufficient support for C++20\"