From ae6af66e21e6e575d60950fe012679ac083be3fa Mon Sep 17 00:00:00 2001
From: Vincent Li <vincent.mc.li@gmail.com>
Date: Thu, 19 Dec 2024 21:59:40 -0800
Subject: [PATCH] pahole: add pahole for kernel BTF generation

CONFIG_DEBUG_INFO_BTF=y requires pahole installed

steps to prepare pahole:

git clone --recurse-submodules  https://kernel.googlesource.com/pub/scm/devel/pahole/pahole.git
cd pahole
git checkout -b v1.28 v1.28
cd ..
mv pahole pahole-1.28
tar czvf pahole-1.28.tar.gz pahole-1.28
b2sum pahole-1.28.tar.gz

Signed-off-by: Vincent Li <vincent.mc.li@gmail.com>
---
 lfs/pahole | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 make.sh    |  1 +
 2 files changed, 79 insertions(+)
 create mode 100644 lfs/pahole

diff --git a/lfs/pahole b/lfs/pahole
new file mode 100644
index 000000000..80464e9a3
--- /dev/null
+++ b/lfs/pahole
@@ -0,0 +1,78 @@
+###############################################################################
+#                                                                             #
+# IPFire.org - A linux based firewall                                         #
+# Copyright (C) 2007-2023  IPFire Team  <info@ipfire.org>                     #
+#                                                                             #
+# This program is free software: you can redistribute it and/or modify        #
+# it under the terms of the GNU General Public License as published by        #
+# the Free Software Foundation, either version 3 of the License, or           #
+# (at your option) any later version.                                         #
+#                                                                             #
+# This program is distributed in the hope that it will be useful,             #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
+# GNU General Public License for more details.                                #
+#                                                                             #
+# You should have received a copy of the GNU General Public License           #
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
+#                                                                             #
+###############################################################################
+
+###############################################################################
+# Definitions
+###############################################################################
+
+include Config
+
+VER        = 1.28
+
+THISAPP    = pahole-$(VER)
+DL_FILE    = $(THISAPP).tar.gz
+DL_FROM    = $(URL_IPFIRE)
+DIR_APP    = $(DIR_SRC)/$(THISAPP)
+TARGET     = $(DIR_INFO)/$(THISAPP)
+
+###############################################################################
+# Top-level Rules
+###############################################################################
+
+objects = $(DL_FILE)
+
+$(DL_FILE) = $(DL_FROM)/$(DL_FILE)
+
+$(DL_FILE)_BLAKE2 = 69760540a6f4fc095587809438f20b6f450d95257678cd90857bff470df2a38b99960d25186a8b1d7140c08bcb43b32bb67a75a4359904c4ef35fb796ec8cd2c
+
+install : $(TARGET)
+
+check : $(patsubst %,$(DIR_CHK)/%,$(objects))
+
+download :$(patsubst %,$(DIR_DL)/%,$(objects))
+
+b2 : $(subst %,%_BLAKE2,$(objects))
+
+###############################################################################
+# Downloading, checking, b2sum
+###############################################################################
+
+$(patsubst %,$(DIR_CHK)/%,$(objects)) :
+	@$(CHECK)
+
+$(patsubst %,$(DIR_DL)/%,$(objects)) :
+	@$(LOAD)
+
+$(subst %,%_BLAKE2,$(objects)) :
+	@$(B2SUM)
+
+###############################################################################
+# Installation Details
+###############################################################################
+
+$(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
+	@$(PREBUILD)
+	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar zxf $(DIR_DL)/$(DL_FILE)
+
+	cd $(DIR_APP) && mkdir build 
+	cd $(DIR_APP)/build && cmake -D__LIB=lib -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_C_FLAGS="-O2" -DCMAKE_CXX_FLAGS="-O2" ..
+	cd $(DIR_APP)/build && make && make install
+	@rm -rf $(DIR_APP)
+	@$(POSTBUILD)
diff --git a/make.sh b/make.sh
index e3c41787e..fa229dff3 100755
--- a/make.sh
+++ b/make.sh
@@ -2088,6 +2088,7 @@ build_system() {
 	lfsmake2 btrfs-progs
 	lfsmake2 inotify-tools
 	lfsmake2 grub-btrfs
+	lfsmake2 pahole
 
 	lfsmake2 linux
 	#lfsmake2 rtl8812au