linux-kernel - [PATCH] kbuild: Fix Propeller build option

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Message-ID: <20241108051030.2918950-1-xur@google.com>
Date: Thu,  7 Nov 2024 21:10:30 -0800
From: Rong Xu <xur@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Rong Xu <xur@...gle.com>, Han Shen <shenhan@...gle.com>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev
Subject: [PATCH] kbuild: Fix Propeller build option

The '-fbasic-block-sections=labels' option has been deprecated with
the following llvm patch:
https://github.com/llvm/llvm-project/pull/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 <xur@...gle.com>
Reported-by: Nathan Chancellor <nathan@...nel.org>
---
 scripts/Makefile.propeller | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/scripts/Makefile.propeller b/scripts/Makefile.propeller
index 344190717e47..1a68ea0d1fe4 100644
--- a/scripts/Makefile.propeller
+++ b/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
 

base-commit: 0dcc2d1066150787017a71f035145c566597dec7
-- 
2.47.0.277.g8800431eea-goog