objtool: Validate disassembler headers in libopcodes probegrafted

commit 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
tested for libopcodes availability by linking a test snippet with a forward
declaration of disassemble_init_for_target().

However, testing symbol linkage with an extern declaration only verifies
the presence of the library (.so/.a) and bypasses checking for development
headers (binutils-dev). On systems where libopcodes is present without
development headers installed, the probe succeeds, enabling BUILD_DISAS.
Subsequent compilation of objtool then fails:

  fatal error: 'bfd.h' file not found
    113 | #include <bfd.h>

Additionally, the probe invokes $(HOSTCC) without $(HOSTCFLAGS), ignoring
any sysroot or include flags specified for the host compiler.

Fix this by including <bfd.h> and <dis-asm.h> directly in the test snippet,
passing $(HOSTCFLAGS) so host compiler options are respected, and defining
PACKAGE="objtool" to satisfy the configuration check in <bfd.h>.

Fixes: 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
Fixes: 436326bc525d ("objtool: fix build failure due to missing libopcodes check")
Reported-by: Alice Ryhl <aliceryhl@google.com>
Assisted-by: Antigravity:Gemini-Next
Signed-off-by: Ulises Mendez Martinez <umendez@google.com>
Link: https://patch.msgid.link/20260904150710.2997558-1-umendez@google.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/scripts/package/buildtar b/scripts/package/buildtar
new file mode 100755
index 000000000..cc87a473c
--- /dev/null
+++ b/scripts/package/buildtar
@@ -0,0 +1,110 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+#
+# buildtar 0.0.5
+#
+# (C) 2004-2006 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
+#
+# This script is used to compile a tarball from the currently
+# prepared kernel. Based upon the builddeb script from
+# Wichert Akkerman <wichert@wiggy.net>.
+#
+
+set -eu
+
+#
+# Some variables and settings used throughout the script
+#
+tmpdir=$1
+
+#
+# Clean-up and re-create the temporary directory
+#
+rm -rf -- "${tmpdir}"
+mkdir -p -- "${tmpdir}/boot"
+
+
+#
+# Try to install dtbs
+#
+if grep -q '^CONFIG_OF_EARLY_FLATTREE=y' include/config/auto.conf; then
+	# Only some architectures with OF support have this target
+	if [ -d "${srctree}/arch/${SRCARCH}/boot/dts" ]; then
+		$MAKE ARCH="${ARCH}" -f ${srctree}/Makefile INSTALL_DTBS_PATH="${tmpdir}/boot/dtbs/${KERNELRELEASE}" dtbs_install
+    fi
+fi
+
+
+#
+# Install modules
+#
+make ARCH="${ARCH}" -f ${srctree}/Makefile INSTALL_MOD_PATH="${tmpdir}" modules_install
+
+
+#
+# Install basic kernel files
+#
+cp -v -- "${objtree}/System.map" "${tmpdir}/boot/System.map-${KERNELRELEASE}"
+cp -v -- "${KCONFIG_CONFIG}" "${tmpdir}/boot/config-${KERNELRELEASE}"
+cp -v -- "${objtree}/vmlinux" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+
+
+#
+# Install arch-specific kernel image(s)
+#
+# Note:
+#   mips and arm64 copy the first image found. This may not produce the desired
+#   outcome because it may pick up a stale file remaining in the build tree.
+#
+case "${ARCH}" in
+	alpha)
+		cp -v -- "${objtree}/arch/alpha/boot/vmlinux.gz" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}"
+		;;
+	parisc*)
+		cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		[ -f "${objtree}/lifimage" ] && cp -v -- "${objtree}/lifimage" "${tmpdir}/boot/lifimage-${KERNELRELEASE}"
+		;;
+	mips)
+		# Please note the following code may copy a stale file.
+		if [ -f "${objtree}/arch/mips/boot/compressed/vmlinux.bin" ]; then
+			cp -v -- "${objtree}/arch/mips/boot/compressed/vmlinux.bin" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}"
+		elif [ -f "${objtree}/arch/mips/boot/compressed/vmlinux.ecoff" ]; then
+			cp -v -- "${objtree}/arch/mips/boot/compressed/vmlinux.ecoff" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}"
+		elif [ -f "${objtree}/arch/mips/boot/compressed/vmlinux.srec" ]; then
+			cp -v -- "${objtree}/arch/mips/boot/compressed/vmlinux.srec" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}"
+		elif [ -f "${objtree}/vmlinux.32" ]; then
+			cp -v -- "${objtree}/vmlinux.32" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		elif [ -f "${objtree}/vmlinux.64" ]; then
+			cp -v -- "${objtree}/vmlinux.64" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		elif [ -f "${objtree}/arch/mips/boot/vmlinux.bin" ]; then
+			cp -v -- "${objtree}/arch/mips/boot/vmlinux.bin" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		elif [ -f "${objtree}/arch/mips/boot/vmlinux.ecoff" ]; then
+			cp -v -- "${objtree}/arch/mips/boot/vmlinux.ecoff" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		elif [ -f "${objtree}/arch/mips/boot/vmlinux.srec" ]; then
+			cp -v -- "${objtree}/arch/mips/boot/vmlinux.srec" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		elif [ -f "${objtree}/vmlinux" ]; then
+			cp -v -- "${objtree}/vmlinux" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
+		fi
+		;;
+	arm64)
+		# Please note the following code may copy a stale file.
+		for i in Image.bz2 Image.gz Image.lz4 Image.lzma Image.lzo vmlinuz.efi ; do
+			if [ -f "${objtree}/arch/arm64/boot/${i}" ] ; then
+				cp -v -- "${objtree}/arch/arm64/boot/${i}" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}"
+				break
+			fi
+		done
+		;;
+	riscv)
+		case "${KBUILD_IMAGE##*/}" in
+			Image.*|vmlinuz.efi)
+				cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}";;
+			*)
+				cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}";;
+		esac
+		;;
+	*)
+		cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}"
+		;;
+esac