From 01d6a500e13f67c1f68c306ad43d4141e38dcc8c Mon Sep 17 00:00:00 2001
From: Lafe Wessel <46427282+LafeWessel@users.noreply.github.com>
Date: Thu, 15 Sep 2022 02:54:08 -0500
Subject: [PATCH 07/20] Fix -DCMAKE_CXX_STANDARD ignored by CMakeLists (#273)

* Fix -DCMAKE_CXX_STANDARD not being used.

Add CACHE to setting CMAKE_CXX_STANDARD to allow for the user to override the default value.

* Fix set not having proper arguments

Fixes #270
---
 CMakeLists.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 82155bd..2cbbf68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,8 +18,9 @@ endif()
 # s2geometry needs to use the same C++ standard that absl used to avoid
 # undefined symbol errors since ABSL_HAVE_STD_STRING_VIEW etc will
 # end up defined differently.  There is probably a better way to achieve
-# this than assuming what absl used.
-set(CMAKE_CXX_STANDARD 11)
+# this than assuming what absl used. 
+# Using CACHE allows the user to override the default.
+set(CMAKE_CXX_STANDARD 11 CACHE STRING "The C++ standard to build with")
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # No compiler-specific extensions, i.e. -std=c++11, not -std=gnu++11.
 set(CMAKE_CXX_EXTENSIONS OFF)
-- 
2.39.2