From 6b0ea3f33e0140129ef707a0bd24f0df4d138eaa Mon Sep 17 00:00:00 2001
From: Lephenixnoir <sebastien.michelland@protonmail.com>
Date: Mon, 27 May 2024 19:03:50 +0200
Subject: [PATCH] meta: enable LTO

Also set -Wa,--dsp also on C files because the fxSDK sets it globally
and LTO complains if -Wa/-Xassembler options are not uniform across all
compilation units.
---
 CMakeLists.txt | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06c9b7b..e13ebf4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ endif()
 if(FXLIBC_TARGET STREQUAL gint)
   list(APPEND TARGET_FOLDERS sh-generic)
   set(FXLIBC_ARCH sh)
+  set(FXLIBC_LTO 1)
   add_definitions(-D__SUPPORT_GINT)
 
   # Default to fxSDK install path
@@ -58,11 +59,19 @@ add_compile_options(-Wall -Wextra -std=c11 -ffreestanding -Os)
 if(FXLIBC_PIC)
   add_compile_options(-fpic)
 endif()
+if(FXLIBC_LTO)
+  add_compile_options(-flto)
+  # Generate the archive with gcc-ar instead of ar as it will load the LTO
+  # plugin which is required to generate a usable archive.
+  set(CMAKE_C_ARCHIVE_CREATE "${CMAKE_C_COMPILER_AR} qcs <TARGET> <OBJECTS>")
+  # Also the ranlib rule (useless because ar is passed the s flag anyway)
+  set(CMAKE_C_ARCHIVE_FINISH "${CMAKE_C_COMPILER_RANLIB} <TARGET>")
+endif()
 
 if(FXLIBC_ARCH STREQUAL sh)
   add_compile_options(
     "$<$<COMPILE_LANGUAGE:C>:-m3;-mb>"
-    "$<$<COMPILE_LANGUAGE:ASM>:-m4-nofpu;-mb;-Wa,--dsp>")
+    "$<$<COMPILE_LANGUAGE:ASM>:-m4-nofpu;-mb>" -Wa,--dsp)
 endif()
 
 # Building