From 339b7cce9ba701aecda7829c7fec6ce9f68fa30d Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Mon, 10 Jul 2023 16:32:51 +0000
Subject: [PATCH] Specifiable -fto parameter in makefiles.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@16328 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
---
 os/common/startup/ARM/compilers/GCC/rules.mk       | 8 ++++++--
 os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk | 8 ++++++--
 os/common/startup/SIMIA32/compilers/GCC/rules.mk   | 8 ++++++--
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/os/common/startup/ARM/compilers/GCC/rules.mk b/os/common/startup/ARM/compilers/GCC/rules.mk
index 1b8a2df38..f0ae61540 100644
--- a/os/common/startup/ARM/compilers/GCC/rules.mk
+++ b/os/common/startup/ARM/compilers/GCC/rules.mk
@@ -23,8 +23,12 @@ ifneq ($(USE_LDOPT),)
 endif
 
 # Link time optimizations
-ifeq ($(USE_LTO),yes)
-  OPT += -flto=auto
+ifneq ($(USE_LTO),no)
+  ifeq ($(USE_LTO),yes)
+    OPT += -flto
+  else
+    OPT += -flto=$(USE_LTO)
+  endif
 endif
 
 # Undefined state stack size
diff --git a/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk b/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
index 1783f87ea..27a49149c 100644
--- a/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
+++ b/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
@@ -23,8 +23,12 @@ ifneq ($(USE_LDOPT),)
 endif
 
 # Link time optimizations
-ifeq ($(USE_LTO),yes)
-  OPT += -flto=auto
+ifneq ($(USE_LTO),no)
+  ifeq ($(USE_LTO),yes)
+    OPT += -flto
+  else
+    OPT += -flto=$(USE_LTO)
+  endif
 endif
 
 # FPU options default (Cortex-M4 and Cortex-M7 single precision).
diff --git a/os/common/startup/SIMIA32/compilers/GCC/rules.mk b/os/common/startup/SIMIA32/compilers/GCC/rules.mk
index 1dcd83c20..1c134dd14 100644
--- a/os/common/startup/SIMIA32/compilers/GCC/rules.mk
+++ b/os/common/startup/SIMIA32/compilers/GCC/rules.mk
@@ -23,8 +23,12 @@ ifneq ($(USE_LDOPT),)
 endif
 
 # Link time optimizations
-ifeq ($(USE_LTO),yes)
-  OPT += -flto=auto
+ifneq ($(USE_LTO),no)
+  ifeq ($(USE_LTO),yes)
+    OPT += -flto
+  else
+    OPT += -flto=$(USE_LTO)
+  endif
 endif
 
 # Output directory and files