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, 71 insertions, 0 deletions

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
new file mode 100644
index 000000000..36f1e3e22
--- /dev/null
+++ b/net/mac80211/Makefile
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_MAC80211) += mac80211.o
+
+# mac80211 objects
+mac80211-y := \
+	main.o status.o \
+	driver-ops.o \
+	sta_info.o \
+	wep.o \
+	aead_api.o \
+	wpa.o \
+	scan.o offchannel.o \
+	ht.o agg-tx.o agg-rx.o \
+	vht.o \
+	he.o \
+	s1g.o \
+	ibss.o \
+	iface.o \
+	link.o \
+	rate.o \
+	tkip.o \
+	aes_cmac.o \
+	aes_gmac.o \
+	fils_aead.o \
+	cfg.o \
+	ethtool.o \
+	rx.o \
+	spectmgmt.o \
+	tx.o \
+	key.o \
+	util.o parse.o \
+	wme.o \
+	chan.o ap.o \
+	trace.o mlme.o \
+	tdls.o \
+	ocb.o \
+	airtime.o \
+	eht.o uhr.o nan.o
+
+mac80211-$(CONFIG_MAC80211_LEDS) += led.o
+mac80211-$(CONFIG_MAC80211_DEBUGFS) += \
+	debugfs.o \
+	debugfs_sta.o \
+	debugfs_netdev.o \
+	debugfs_key.o
+
+mac80211-$(CONFIG_MAC80211_MESH) += \
+	mesh.o \
+	mesh_pathtbl.o \
+	mesh_plink.o \
+	mesh_hwmp.o \
+	mesh_sync.o \
+	mesh_ps.o
+
+mac80211-$(CONFIG_PM) += pm.o
+
+CFLAGS_trace.o := -I$(src)
+
+rc80211_minstrel-y := \
+	rc80211_minstrel_ht.o
+
+rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += \
+	rc80211_minstrel_ht_debugfs.o
+
+mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
+
+obj-y += tests/
+
+mac80211-y += wbrf.o
+
+ccflags-y += -DDEBUG