From 8b0b80000818199ea623897b1ad3705b657983c6 Mon Sep 17 00:00:00 2001
From: Tiger Wang <ziwei.tiger@outlook.com>
Date: Sun, 31 May 2020 20:26:50 +0100
Subject: Configurable LTO (#4755)

---
 CMakeLists.txt | 10 +++++-----
 travisbuild.sh |  5 +++--
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5c16c0e40..6b0ce4afa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,11 +97,11 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-# The need for speed (in Release)
-include(CheckIPOSupported)
-check_ipo_supported(RESULT IPO_SUPPORTED)
-if(IPO_SUPPORTED)
-	set(CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE ON)
+# The need for speed (in Release):
+if(WHOLE_PROGRAM_OPTIMISATION)
+	include(CheckIPOSupported)
+	check_ipo_supported(RESULT IPO_SUPPORTED)
+	set(CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE ${IPO_SUPPORTED})
 endif()
 
 # Static CRT
diff --git a/travisbuild.sh b/travisbuild.sh
index 5c4a559bb..d1a535e72 100755
--- a/travisbuild.sh
+++ b/travisbuild.sh
@@ -20,12 +20,13 @@ if [ `which ccache` ]; then
 	ccache -z # Zero statistics
 fi
 
-# Work around a Clang + ccache issue with failing
-# builds by disabling precompiled headers
+# Work around a Clang + ccache issue with failing builds by disabling
+# precompiled headers. Turn off LTO for faster build speeds
 cmake . -DBUILD_TOOLS=YES \
         -DPRECOMPILE_HEADERS=NO \
         -DUNITY_BUILDS=${TRAVIS_CUBERITE_UNITY_BUILDS-YES} \
         -DSELF_TEST=YES \
+        -DWHOLE_PROGRAM_OPTIMISATION=No \
         ${CACHE_ARGS};
 
 echo "Building..."
-- 
cgit v1.2.3