From 2aab8d488e45db41633fb090a82b1ce9dc229dce Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Mon, 15 Apr 2019 20:35:15 +0300
Subject: [PATCH] Issue a warning when an imported location is overwritten

---
 boost-install.jam | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/boost-install.jam b/boost-install.jam
index 176e07c..3749102 100644
--- a/boost-install.jam
+++ b/boost-install.jam
@@ -269,11 +269,18 @@ rule generate-cmake-variant- ( target : sources * : properties * )
     local target = "Boost::$(lname)" ;
     .info "  target=" $(target) ;
 
-    print.text "# Target file name: $(fname)" : true ;
+    print.text "# Target file name: $(fname)" "" : true ;
 
     print.text
 
+        "get_target_property(__boost_imploc $(target) IMPORTED_LOCATION_$(variant:U))"
+        "if(__boost_imploc)"
+        "  message(WARNING \"Target $(target) already has an imported location '${__boost_imploc}', which will be overwritten with '${_BOOST_LIBDIR}/$(fname)'\")"
+        "endif()"
+        "unset(__boost_imploc)"
+        ""
         "set_property(TARGET $(target) APPEND PROPERTY IMPORTED_CONFIGURATIONS $(variant:U))"
+        ""
         "set_target_properties($(target) PROPERTIES"
         "  IMPORTED_LINK_INTERFACE_LANGUAGES_$(variant:U) CXX"
         "  IMPORTED_LOCATION_$(variant:U) \"${_BOOST_LIBDIR}/$(fname)\""