Undefined reference when trying to make

[sinashan]

Hi

I'm using cmake for syscall_intercept. Now, when I want to make, I get the following error:

[  0%] Built target gen_ctags
[  0%] Built target check_whitespace
[  2%] Built target cpp_test
[  2%] Built target cstyle
Scanning dependencies of target syscall_intercept_base_c
[  3%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/disasm_wrapper.c.o
[  4%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/intercept.c.o
[  4%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/intercept_desc.c.o
[  5%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/intercept_log.c.o
[  6%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/intercept_util.c.o
[  6%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/patcher.c.o
[  7%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/magic_syscalls.c.o
[  8%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/syscall_formats.c.o
[  8%] Built target syscall_intercept_base_c
Scanning dependencies of target syscall_intercept_base_clf
[  8%] Building C object CMakeFiles/syscall_intercept_base_clf.dir/src/cmdline_filter.c.o
[  8%] Built target syscall_intercept_base_clf
Scanning dependencies of target syscall_intercept_base_asm
[  8%] Building ASM object CMakeFiles/syscall_intercept_base_asm.dir/src/intercept_template.S.o
[  9%] Building ASM object CMakeFiles/syscall_intercept_base_asm.dir/src/util.S.o
[  9%] Building ASM object CMakeFiles/syscall_intercept_base_asm.dir/src/intercept_wrapper.S.o
[  9%] Built target syscall_intercept_base_asm
Scanning dependencies of target syscall_intercept_unscoped
[ 10%] Linking C static library libsyscall_intercept_unscoped.a
[ 10%] Built target syscall_intercept_unscoped
Scanning dependencies of target generate_syscall_intercept_scoped
[ 11%] Generating syscall_intercept_unscoped.o
[ 12%] Generating syscall_intercept_scoped.o
[ 12%] Built target generate_syscall_intercept_scoped
Scanning dependencies of target syscall_intercept_shared
[ 12%] Linking C shared library libsyscall_intercept.so
[ 14%] Built target syscall_intercept_shared
Scanning dependencies of target syscall_intercept_static
[ 15%] Linking C static library libsyscall_intercept.a
[ 16%] Built target syscall_intercept_static
Scanning dependencies of target check_license_executable
[ 16%] Building C object CMakeFiles/check_license_executable.dir/utils/check_license/check-license.c.o
[ 17%] Linking C executable check_license_executable
[ 17%] Built target check_license_executable
Scanning dependencies of target syscall_logger
[ 17%] Building C object examples/CMakeFiles/syscall_logger.dir/syscall_logger.c.o
[ 18%] Building C object examples/CMakeFiles/syscall_logger.dir/syscall_desc.c.o
[ 19%] Linking C shared library libsyscall_logger.so
[ 19%] Built target syscall_logger
Scanning dependencies of target fork_ban
[ 19%] Building C object examples/CMakeFiles/fork_ban.dir/fork_ban.c.o
[ 20%] Linking C shared library libfork_ban.so
[ 20%] Built target fork_ban
Scanning dependencies of target icap
[ 21%] Building C object examples/CMakeFiles/icap.dir/icap.c.o
[ 21%] Linking C shared library libicap.so
[ 21%] Built target icap
Scanning dependencies of target vfork_logging
[ 22%] Building C object test/CMakeFiles/vfork_logging.dir/vfork_logging.c.o
[ 23%] Linking C executable vfork_logging
[ 23%] Built target vfork_logging
Scanning dependencies of target intercept_sys_write
[ 24%] Building C object test/CMakeFiles/intercept_sys_write.dir/intercept_sys_write.c.o
[ 25%] Linking C shared library libintercept_sys_write.so
[ 25%] Built target intercept_sys_write
Scanning dependencies of target test_clone_thread_preload
[ 26%] Building C object test/CMakeFiles/test_clone_thread_preload.dir/test_clone_thread_preload.c.o
[ 26%] Linking C shared library libtest_clone_thread_preload.so
[ 26%] Built target test_clone_thread_preload
Scanning dependencies of target test_clone_thread
[ 26%] Building C object test/CMakeFiles/test_clone_thread.dir/test_clone_thread.c.o
[ 27%] Linking C executable test_clone_thread
[ 27%] Built target test_clone_thread
Scanning dependencies of target filter_test
[ 27%] Building C object test/CMakeFiles/filter_test.dir/filter_test.c.o
[ 28%] Linking C executable filter_test
../libsyscall_intercept.so.0.1.0: undefined reference to `cs_option'
../libsyscall_intercept.so.0.1.0: undefined reference to `cs_free'
../libsyscall_intercept.so.0.1.0: undefined reference to `cs_disasm_iter'
../libsyscall_intercept.so.0.1.0: undefined reference to `cs_malloc'
../libsyscall_intercept.so.0.1.0: undefined reference to `cs_open'
../libsyscall_intercept.so.0.1.0: undefined reference to `cs_close'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [test/filter_test] Error 1
make[1]: *** [test/CMakeFiles/filter_test.dir/all] Error 2
make: *** [all] Error 2

What does this "undefined reference" mean? And how can I solve the issue? Thanks

[gohar94]

I was running into a similar issue with an undefined reference to cs_open (although at runtime).

I am building my project using CMake and was able to resolve it by linking to the capstone library explicitly by adding the following source:

include(FindPkgConfig)

pkg_check_modules (CAPSTONE REQUIRED capstone)

# Use CAPSTONE_FOUND, CAPSTONE_LIBRARIES, CAPSTONE_INCLUDE_DIRS vars
target_link_libraries(${PROJECT_NAME} ${CAPSTONE_LIBRARIES})

If you are not using CMake, you might have to do something equivalent by explicitly linking against the capstone library. This could be something like adding -llibcapstone to your build command.