From 55e6761bf14eb0707c8f6cc7dbff8c7445348ea1 Mon Sep 17 00:00:00 2001
From: iTrooz <hey@itrooz.fr>
Date: Sat, 5 Aug 2023 20:39:20 +0200
Subject: [PATCH] build: Fix LTO not being enabled correctly (#1217)

Currently, LTO isn't enabled (at least on Linux ?), because LTO doesn't
recognize any language as being enabled.

I fixed that by explicitly enabling C and CXX languages before enabling
LTO
---
 cmake/build_helpers.cmake | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/cmake/build_helpers.cmake b/cmake/build_helpers.cmake
index 57d227a5f..ef3ab4d51 100644
--- a/cmake/build_helpers.cmake
+++ b/cmake/build_helpers.cmake
@@ -277,6 +277,9 @@ endfunction()
 macro(configureCMake)
     message(STATUS "Configuring ImHex v${IMHEX_VERSION}")
 
+    # Enable C and C++ languages
+    enable_language(C CXX)
+
     # Configure use of recommended build tools
     if (IMHEX_USE_DEFAULT_BUILD_SETTINGS)
         message(STATUS "Configuring CMake to use recommended build tools...")
@@ -335,12 +338,12 @@ macro(configureCMake)
     if (IMHEX_ENABLE_LTO)
         include(CheckIPOSupported)
 
-        check_ipo_supported(RESULT result)
+        check_ipo_supported(RESULT result OUTPUT output_error)
         if (result)
             set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
             message(STATUS "LTO enabled!")
         else ()
-            message(WARNING "LTO is not supported!")
+            message(WARNING "LTO is not supported: ${output_error}")
         endif ()
     endif ()