From a54cb108d4634e768ad3ce0855313991ccc768de Mon Sep 17 00:00:00 2001
From: Gleb Mazovetskiy <glex.spb@gmail.com>
Date: Mon, 22 May 2023 22:17:32 +0100
Subject: [PATCH] CMake: Do not fail on unknown compiler features (#3453)

If CMake does not know much about a compiler, `target_compile_features` will fail. Issue a warning instead.
---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb650f41..e1f57bb1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -297,7 +297,11 @@ if (FMT_PEDANTIC)
   target_compile_options(fmt PRIVATE ${PEDANTIC_COMPILE_FLAGS})
 endif ()
 
-target_compile_features(fmt PUBLIC cxx_std_11)
+if (cxx_std_11 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+  target_compile_features(fmt PUBLIC cxx_std_11)
+else ()
+  message(WARNING "Feature cxx_std_11 is unknown for the CXX compiler")
+endif ()
 
 target_include_directories(fmt ${FMT_SYSTEM_HEADERS_ATTRIBUTE} PUBLIC
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>