From 040f503d83321ddfdf3f401f538dec721fe03842 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 27 Mar 2020 08:17:51 -0400
Subject: FindBoost: Clarify logic selecting Boost_LIB_PREFIX

Also add a comment explaining its purpose.
---
 Modules/FindBoost.cmake | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index 3c52466..38d3bfa 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -1646,10 +1646,15 @@ endif()
 #  Prefix initialization
 # ------------------------------------------------------------------------
 
-set(Boost_LIB_PREFIX "")
-if ( (GHSMULTI AND Boost_USE_STATIC_LIBS) OR
-    (WIN32 AND Boost_USE_STATIC_LIBS AND NOT CYGWIN) )
+# Boost's static libraries use a "lib" prefix on DLL platforms
+# to distinguish them from the DLL import libraries.
+if (Boost_USE_STATIC_LIBS AND (
+    (WIN32 AND NOT CYGWIN)
+    OR GHSMULTI
+    ))
   set(Boost_LIB_PREFIX "lib")
+else()
+  set(Boost_LIB_PREFIX "")
 endif()
 
 if ( NOT Boost_NAMESPACE )
-- 
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