[Core] Squeeze AVR some more with -mrelax and -mcall-prologues (#…

…16269)
qmk · Feb 27, 2022 · 156f056 · 156f056
1 parent cb8528c
commit 156f056
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/platforms/avr/platform.mk b/platforms/avr/platform.mk
@@ -18,6 +18,13 @@ COMPILEFLAGS += -ffunction-sections
 COMPILEFLAGS += -fdata-sections
 COMPILEFLAGS += -fpack-struct
 COMPILEFLAGS += -fshort-enums
+COMPILEFLAGS += -mcall-prologues
+
+# Linker relaxation is only possible if
+# link time optimizations are not enabled.
+ifeq ($(strip $(LTO_ENABLE)), no)
+	COMPILEFLAGS += -mrelax
+endif
 
 ASFLAGS += $(AVR_ASFLAGS)
 
@@ -28,7 +35,7 @@ CFLAGS += -fno-strict-aliasing
 CXXFLAGS += $(COMPILEFLAGS)
 CXXFLAGS += -fno-exceptions -std=c++11
 
-LDFLAGS +=-Wl,--gc-sections
+LDFLAGS += -Wl,--gc-sections
 
 OPT_DEFS += -DF_CPU=$(F_CPU)UL