kbuild: Fix Propeller build option

The '-fbasic-block-sections=labels' option has been deprecated with
the following llvm patch:
llvm/llvm-project#110039

The old option still works, but with a warning like
  clang: warning: argument '-fbasic-block-sections=labels' \
  is deprecated, use '-fbasic-block-address-map' instead [-Wdeprecated]

Currently, the option change is only in the ToT clang (v20) and not yet
released in v19.

This patch adds a check to the Makefile to set the proper option.

If the option change is later integrated in v19.x, we need to update the
check accordingly.

Signed-off-by: Rong Xu <[email protected]>
Reported-by: Nathan Chancellor <[email protected]>

Author: xur-llvm

scripts/Makefile.propeller

@@ -5,7 +5,13 @@ ifdef CLANG_PROPELLER_PROFILE_PREFIX
   CFLAGS_PROPELLER_CLANG := -fbasic-block-sections=list=$(CLANG_PROPELLER_PROFILE_PREFIX)_cc_profile.txt -ffunction-sections
   KBUILD_LDFLAGS += --symbol-ordering-file=$(CLANG_PROPELLER_PROFILE_PREFIX)_ld_profile.txt --no-warn-symbol-ordering
 else
-  CFLAGS_PROPELLER_CLANG := -fbasic-block-sections=labels
+  # Staring with clang v20, the '-fbasic-block-sections=labels' option is
+  # deprecated. Use the recommended '-fbasic-block-address-map' option.
+  ifeq ($(call clang-min-version, 200000),y)
+    CFLAGS_PROPELLER_CLANG := -fbasic-block-address-map
+  else
+    CFLAGS_PROPELLER_CLANG := -fbasic-block-sections=labels
+  endif
 endif
 
 # Propeller requires debug information to embed module names in the profiles.
@@ -21,7 +27,11 @@ ifdef CONFIG_LTO_CLANG_THIN
   ifdef CLANG_PROPELLER_PROFILE_PREFIX
     KBUILD_LDFLAGS += --lto-basic-block-sections=$(CLANG_PROPELLER_PROFILE_PREFIX)_cc_profile.txt
   else
-    KBUILD_LDFLAGS += --lto-basic-block-sections=labels
+    ifeq ($(call clang-min-version, 200000),y)
+       KBUILD_LDFLAGS += --lto-basic-block-address-map
+    else
+       KBUILD_LDFLAGS += --lto-basic-block-sections=labels
+    endif
   endif
 endif