objtool: Validate disassembler headers in libopcodes probe
PATCH 1/1 objtool: Validate disassembler headers in libopcodes probe
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>.
--- tools/objtool/Makefile | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
tools/objtool/Makefile +5 -3
@@ -89,9 +89,11 @@ LIBOPCODES_LIBS := $(shell \ "-lopcodes -lbfd" \ "-lopcodes -lbfd -liberty" \ "-lopcodes -lbfd -liberty -lz"; do \ - echo 'extern void disassemble_init_for_target(void *);' \ - 'int main(void) { disassemble_init_for_target(0); return 0; }' | \ - $(HOSTCC) -xc - -o /dev/null $$libs 2>/dev/null && \ + printf '%s\n' \ + '$(pound)include <bfd.h>' \ + '$(pound)include <dis-asm.h>' \ + 'int main(void) { disassemble_init_for_target(0); return 0; }' | \ + $(HOSTCC) $(HOSTCFLAGS) -DPACKAGE='"objtool"' -xc - -o /dev/null $$libs 2>/dev/null && \ echo "$$libs" && break; \ done)
Signature · 1 line
2.55.0.979.g7e5102b832-goog
The following commit has been merged into the objtool/urgent branch of tip:
The following commit has been merged into the objtool/urgent branch of tip:
Commit-ID: 7e61560628d17ea6b1d8ee370f6d42694cff8758 Gitweb: https://git.kernel.org/tip/7e61560628d17ea6b1d8ee370f6d42694cff8758 Author: Ulises Mendez Martinez <[email protected]> AuthorDate: Fri, 04 Sep 2026 15:07:09 Committer: Josh Poimboeuf <[email protected]> CommitterDate: Sun, 13 Sep 2026 18:15:43 -07:00
objtool: Validate disassembler headers in libopcodes probe
commit 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries") tested for libopcodes availability by linking a test snippet with a forward declaration of disassemble_init_for_target().
However, testing symbol linkage with an extern declaration only verifies the presence of the library (.so/.a) and bypasses checking for development headers (binutils-dev). On systems where libopcodes is present without development headers installed, the probe succeeds, enabling BUILD_DISAS. Subsequent compilation of objtool then fails:
fatal error: 'bfd.h' file not found
113 | #include <bfd.h>
Additionally, the probe invokes $(HOSTCC) without $(HOSTCFLAGS), ignoring any sysroot or include flags specified for the host compiler.
Fix this by including <bfd.h> and <dis-asm.h> directly in the test snippet, passing $(HOSTCFLAGS) so host compiler options are respected, and defining PACKAGE="objtool" to satisfy the configuration check in <bfd.h>.
--- tools/objtool/Makefile | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
tools/objtool/Makefile +5 -3
@@ -89,9 +89,11 @@ LIBOPCODES_LIBS := $(shell \ "-lopcodes -lbfd" \ "-lopcodes -lbfd -liberty" \ "-lopcodes -lbfd -liberty -lz"; do \ - echo 'extern void disassemble_init_for_target(void *);' \ - 'int main(void) { disassemble_init_for_target(0); return 0; }' | \ - $(HOSTCC) -xc - -o /dev/null $$libs 2>/dev/null && \ + printf '%s\n' \ + '$(pound)include <bfd.h>' \ + '$(pound)include <dis-asm.h>' \ + 'int main(void) { disassemble_init_for_target(0); return 0; }' | \ + $(HOSTCC) $(HOSTCFLAGS) -DPACKAGE='"objtool"' -xc - -o /dev/null $$libs 2>/dev/null && \ echo "$$libs" && break; \ done)