GCC 10 lto Topic is solved

[Tuxford]

Hi All,
After migration from older GCC to 10.2 linker produces warning regarding incorrect usage of -flto
I found that in ChibiOS it without value but should be with value.
I added next thing and warning doesn't appear anymore. Is it correct way?

Code: Select all

--- a/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
+++ b/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
@@ -24,7 +24,7 @@ endif
 
 # Link time optimizations
 ifeq ($(USE_LTO),yes)
-  OPT += -flto
+  OPT += -flto=auto^M
 endif


[Giovanni]

Hi,

Is this compatible with older GCCs?

Giovanni

[Tuxford]

I can't check on very old GCC. On GCC 7 auto is good.

[Giovanni]

Thanks, GCC7 is old enough.

Giovanni

[Giovanni]

Thanks, change committed.

Giovanni