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, 56 insertions, 0 deletions

diff --git a/net/wireless/Makefile b/net/wireless/Makefile
new file mode 100644
index 000000000..a77fd5ba6
--- /dev/null
+++ b/net/wireless/Makefile
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_CFG80211) += cfg80211.o
+obj-y += tests/
+
+obj-$(CONFIG_WEXT_CORE) += wext-core.o
+obj-$(CONFIG_WEXT_PROC) += wext-proc.o
+obj-$(CONFIG_WEXT_PRIV) += wext-priv.o
+
+cfg80211-y += core.o sysfs.o radiotap.o util.o reg.o scan.o nl80211.o
+cfg80211-y += mlme.o ibss.o sme.o chan.o ethtool.o mesh.o ap.o trace.o ocb.o
+cfg80211-y += michael-mic.o pmsr.o
+cfg80211-$(CONFIG_OF) += of.o
+cfg80211-$(CONFIG_CFG80211_DEBUGFS) += debugfs.o
+cfg80211-$(CONFIG_CFG80211_WEXT) += wext-compat.o wext-sme.o
+
+CFLAGS_trace.o := -I$(src)
+
+cfg80211-$(CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS) += shipped-certs.o
+ifneq ($(CONFIG_CFG80211_EXTRA_REGDB_KEYDIR),)
+cfg80211-y += extra-certs.o
+endif
+
+$(obj)/shipped-certs.c: $(sort $(wildcard $(src)/certs/*.hex))
+	@$(kecho) "  GEN     $@"
+	$(Q)(echo '#include "reg.h"'; \
+	  echo 'const u8 shipped_regdb_certs[] = {'; \
+	  echo | cat - $^ ; \
+	  echo '};'; \
+	  echo 'unsigned int shipped_regdb_certs_len = sizeof(shipped_regdb_certs);'; \
+	 ) > $@
+
+$(obj)/extra-certs.c: $(CONFIG_CFG80211_EXTRA_REGDB_KEYDIR) \
+		      $(sort $(wildcard $(CONFIG_CFG80211_EXTRA_REGDB_KEYDIR)/*.x509))
+	@$(kecho) "  GEN     $@"
+	$(Q)(set -e; \
+	  allf=""; \
+	  for f in $^ ; do \
+	      test -f $$f || continue;\
+	      # similar to hexdump -v -e '1/1 "0x%.2x," "\n"' \
+	      thisf=$$(od -An -v -tx1 < $$f | \
+	                   sed -e 's/ /\n/g' | \
+	                   sed -e 's/^[0-9a-f]\+$$/\0/;t;d' | \
+	                   sed -e 's/^/0x/;s/$$/,/'); \
+	      # file should not be empty - maybe command substitution failed? \
+	      test ! -z "$$thisf";\
+	      allf=$$allf$$thisf;\
+	  done; \
+	  ( \
+	      echo '#include "reg.h"'; \
+	      echo 'const u8 extra_regdb_certs[] = {'; \
+	      echo "$$allf"; \
+	      echo '};'; \
+	      echo 'unsigned int extra_regdb_certs_len = sizeof(extra_regdb_certs);'; \
+	  ) > $@)
+
+clean-files += shipped-certs.c extra-certs.c