From 4d654c09e5471bbe398f266067cc9560c2f328be Mon Sep 17 00:00:00 2001
From: Dana Jansens <danakj@orodu.net>
Date: Thu, 24 Aug 2023 22:51:01 -0400
Subject: [PATCH] Don't expect the UDL definition for GCC < 4.9

The compile tests should expect the UDL to
be there on GCC only for version 4.9 and above.
---
 test/compile-error-test/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/compile-error-test/CMakeLists.txt b/test/compile-error-test/CMakeLists.txt
index c4a160688d4c..495f659859af 100644
--- a/test/compile-error-test/CMakeLists.txt
+++ b/test/compile-error-test/CMakeLists.txt
@@ -177,6 +177,12 @@ set(CMAKE_REQUIRED_FLAGS )
 if (NOT SUPPORTS_USER_DEFINED_LITERALS)
   set (SUPPORTS_USER_DEFINED_LITERALS OFF)
 endif ()
+if (SUPPORTS_USER_DEFINED_LITERALS AND CMAKE_COMPILER_IS_GNUCXX)
+  # GCC before 4.9 is not supported for user-defined literals as it requires an
+  # invalid syntax in their definition.
+  set (SUPPORTS_USER_DEFINED_LITERALS
+    $<IF:$<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,4.9.0>,OFF,ON>
+endif()
 
 # Make sure that compiler features detected in the header
 # match the features detected in CMake.