From b4db7136eb99c00c63cda9226cd26c5f025e995f Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Wed, 16 Jan 2019 14:32:07 +1100
Subject: [PATCH] optimisation: add lto odr-type-merging and partition=none

---
 nc_optimisation.cmake | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/nc_optimisation.cmake b/nc_optimisation.cmake
index 28de5d8..27125c1 100644
--- a/nc_optimisation.cmake
+++ b/nc_optimisation.cmake
@@ -28,11 +28,17 @@ if (LTO)
     append_link_flag("-fuse-linker-plugin")
     append_link_flag("-flto")
 
-    # Actually enable LTO object creation, but try very hard to avoid
+    # Enable LTO on the compilation side, but try very hard to avoid
     # situations where we may accidentally use regular/fat objects.
     append_compile_flag("-flto")
     append_compile_flag("-fno-fat-lto-objects")
 
+    # Try to squeeze out some more diagnostics via LTO
+    append_compile_flag("-flto-odr-type-merging")
+
+    # GCC: Attempt to use a more aggressive whole-program style of LTO
+    append_compile_flag("-flto-partition=none")
+
     # Throw in some optimisation flags that are LTO specific. We don't
     # particularly care about checking Debug/Release here because LTO is
     # pretty heavyweight anyway.