[GitHub] [nuttx] anchao commented on a diff in pull request #8903: Fix LTO warnings with GCC 12

["anchao (via GitHub)" <gi...@apache.org>]

anchao commented on code in PR #8903:
URL: https://github.com/apache/nuttx/pull/8903#discussion_r1162961965


##########
arch/arm/src/common/Toolchain.defs:
##########
@@ -248,6 +214,27 @@ ifeq ($(CONFIG_ARCH_TOOLCHAIN_CLANG),y)
   ARCHOPTIMIZATION += -fshort-enums
 endif
 
+# Link Time Optimization
+
+ifeq ($(CONFIG_LTO_THIN),y)
+  ARCHOPTIMIZATION += -flto=thin
+  ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+    LDFLAGS += --lto
+  endif
+else ifeq ($(CONFIG_LTO_FULL),y)
+  ifeq ($(GCCVER),12.2)
+    ARCHOPTIMIZATION += -flto=auto

Review Comment:
   we can skip the version check, always set -flto-auto as default



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