From 32fc01c08f0fdd154c3b515a3c24165afa981ce3 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 7 Jan 2020 14:50:44 +0100
Subject: CMake: use more neutral DISABLE_TIFF switch (refs
 https://github.com/OSGeo/PROJ/pull/1790#discussion_r363750361)

---
 CMakeLists.txt | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2125b93a..0d5524db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -140,11 +140,15 @@ ENDIF()
 # Check for libtiff
 ################################################################################
 
-option(DISABLE_TIFF_IS_STRONGLY_DISCOURAGED "Disable TIFF support (strongly discouraged !)" OFF)
-mark_as_advanced(DISABLE_TIFF_IS_STRONGLY_DISCOURAGED)
-if(NOT DISABLE_TIFF_IS_STRONGLY_DISCOURAGED)
+option(DISABLE_TIFF "Disable TIFF support" OFF)
+mark_as_advanced(DISABLE_TIFF)
+if(DISABLE_TIFF)
+  message(WARNING "TIFF support has been disabled and will result in the inability to read some grids")
+else()
   find_package(TIFF REQUIRED)
-  if(NOT TIFF_FOUND)
+  if(TIFF_FOUND)
+    boost_report_value(TIFF_FOUND)
+  else()
     message(SEND_ERROR "libtiff dependency not found!")
   endif()
   add_definitions(-DTIFF_ENABLED)
-- 
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