From fb4ebb87e52aba4518662c855f266b96f08ea4ef Mon Sep 17 00:00:00 2001
From: AntoinePrv <AntoinePrv@users.noreply.github.com>
Date: Wed, 9 Aug 2023 15:59:13 +0200
Subject: [PATCH] Handle no CMAKE_BUILD_TYPE in LTO

---
 cmake/LinkTimeOptimization.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/LinkTimeOptimization.cmake b/cmake/LinkTimeOptimization.cmake
index 2708cd7723..5a9d6ef916 100644
--- a/cmake/LinkTimeOptimization.cmake
+++ b/cmake/LinkTimeOptimization.cmake
@@ -24,7 +24,7 @@ function(mamba_should_lto)
     endif()
 
     # Check if we are building in a release-like build
-    string(TOLOWER ${CMAKE_BUILD_TYPE} build_type_lower)
+    string(TOLOWER "${CMAKE_BUILD_TYPE}" build_type_lower)
     set(valid_release_names "release" "relwithdebinfo")
     if(NOT ${build_type_lower} IN_LIST valid_release_names)
         set(${arg_RESULT} FALSE PARENT_SCOPE)