From 43e9b29e50b4904bf3210004e6d0e123ae70e13e Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@fb.com>
Date: Sun, 2 Feb 2020 08:29:33 -0800
Subject: [PATCH] Only use compiler features if available

---
 CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a645ef32..a62ee7e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,7 +69,13 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
 include(cxx14)
 include(CheckCXXCompilerFlag)
 
-set(FMT_REQUIRED_FEATURES cxx_auto_type cxx_variadic_templates)
+list(FIND CMAKE_CXX_COMPILE_FEATURES "cxx_variadic_templates" index)
+if (${index} GREATER -1)
+  # Use cxx_variadic_templates instead of more appropriate cxx_std_11 for
+  # compatibility with older CMake versions.
+  set(FMT_REQUIRED_FEATURES cxx_variadic_templates)
+endif ()
+message(STATUS "Required features: ${FMT_REQUIRED_FEATURES}")
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
   set(PEDANTIC_COMPILE_FLAGS -pedantic-errors -Wall -Wextra -pedantic