GCC：对“__asan_init_v1”的未定义引用

Question

我想用标志编译我的 C99 项目-fsanitize=address。我需要使用 CMake 并在 Centos 7 发行版上使用 gcc 进行编译。

我目前有gcc 7.3.1和cmake 3.13.4。

我-fsanitize=address在编译标志列表和链接器中添加了标志，但它仍然无法编译并出现以下错误：

[ 6%] Building C object CMakeFiles/last.dir/src/ast/ast.c.o
[ 13%] Building C object CMakeFiles/last.dir/src/ast/ast_printer.c.o
[ 20%] Building C object CMakeFiles/last.dir/src/ast/cleaner.c.o
[ 26%] Linking C static library liblast.a
[ 26%] Built target last
[ 33%] Building C object CMakeFiles/lexecution.dir/src/execution/exec_parser.c.o
[ 40%] Building C object CMakeFiles/lexecution.dir/src/execution/exec_utils.c.o
[ 46%] Building C object CMakeFiles/lexecution.dir/src/execution/exec_func.c.o
[ 53%] Building C object CMakeFiles/lexecution.dir/src/execution/exec_parser_options.c.o
[ 60%] Linking C static library liblexecution.a
[ 60%] Built target lexecution
[ 66%] Building C object CMakeFiles/lutils.dir/tests/utils/utils.c.o
[ 73%] Linking C static library liblutils.a
[ 73%] Built target lutils
[ 80%] Building C object CMakeFiles/lhist.dir/src/history/history.c.o
[ 86%] Linking C static library liblhist.a
[ 86%] Built target lhist
[ 93%] Building C object CMakeFiles/42sh.dir/src/execution/exec_42sh.c.o
[100%] Linking C executable 42sh
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libasan_preinit.o:(.preinit_array+0x0) : undefined reference to « __asan_init_v1 »
CMakeFiles/42sh.dir/src/execution/exec_42sh.c.o : In function « _GLOBAL__sub_I_00099_1_flag » :
/home/lyro/Documents/customshell/src/execution/exec_42sh.c:304 : undefined reference to « __asan_init_v1 »
liblexecution.a(exec_parser.c.o) : In function « _GLOBAL__sub_I_00099_1_parser_new_from_string » :
/home/lyro/Documents/customshell/src/execution/exec_parser.c:1105 : undefined reference to « __asan_init_v1 »
liblexecution.a(exec_utils.c.o) : In function « _GLOBAL__sub_I_00099_0_get_args_array » :
/home/lyro/Documents/customshell/src/execution/exec_utils.c:242 : undefined reference to « __asan_init_v1 »
liblexecution.a(exec_func.c.o) : In function « _GLOBAL__sub_I_00099_1_exec_ast » :
/home/lyro/Documents/customshell/src/execution/exec_func.c:187 : undefined reference to « __asan_init_v1 »
liblexecution.a(exec_parser_options.c.o):/home/lyro/Documents/customshell/src/execution/exec_parser_options.c:149 : more undefined references to « __asan_init_v1 »
collect2: error: ld returned 1 execution state code
make[2]: *** [42sh] Error 1
make[1]: *** [CMakeFiles/42sh.dir/all] Error 2
make: *** [all] Error 2

这是我的CMakeLists.txt文件，我找不到我丢失的东西..

cmake_minimum_required(VERSION 3.0)
project(42SH LANGUAGES C)
add_compile_options(-Wall -Wextra -Werror -pedantic -fsanitize=address -g -std=c99)

add_library(last ${CMAKE_SOURCE_DIR}/src/ast/ast.c ${CMAKE_SOURCE_DIR}/src/ast/ast_printer.c ${CMAKE_SOURCE_DIR}/src/ast/cleaner.c)
target_include_directories(last PUBLIC ${CMAKE_SOURCE_DIR}/src/ast)

add_library(lutils ${CMAKE_SOURCE_DIR}/tests/utils/utils.c)
target_include_directories(lutils PUBLIC ${CMAKE_SOURCE_DIR}/tests/utils)
target_link_libraries(lutils -fsanitize=address lexecution)

add_library(lexecution ${CMAKE_SOURCE_DIR}/src/execution/exec_parser.c ${CMAKE_SOURCE_DIR}/src/execution/exec_utils.c ${CMAKE_SOURCE_DIR}/src/execution/exec_func.c ${CMAKE_SOURCE_DIR}/src/execution/exec_parser_options.c)
target_include_directories(lexecution PUBLIC ${CMAKE_SOURCE_DIR}/src/ast)
target_link_libraries(lexecution -fsanitize=address last)

add_library(lhist ${CMAKE_SOURCE_DIR}/src/history/history.c)
target_include_directories(lhist PUBLIC ${CMAKE_SOURCE_DIR}/src/history)

add_executable(42sh src/execution/exec_42sh.c)
target_link_libraries(42sh -fsanitize=address lexecution)
target_link_libraries(42sh -fsanitize=address lutils)
target_link_libraries(42sh -fsanitize=address last)
target_link_libraries(42sh -fsanitize=address lhist)

add_custom_target(submit
    COMMENT "Compiled for submission. Sanitizers ON."
    COMMENT "Don't use Valgrind on this executable. It will not work."
    DEPENDS 42sh
)

add_custom_target(tests
    COMMAND pytest ${CMAKE_SOURCE_DIR}/tests
    COMMENT "Running testsuite..."
    DEPENDS 42sh
)

add_custom_target(doc
    COMMENT "Compiling  documentation"
    COMMAND doxygen ${CMAKE_SOURCE_DIR}/doc/Doxyfile
    COMMENT "Compiled documentation"
)

Answer 1

您的工具链对它是哪个 GCC 版本有些困惑，而链接失败是这种混淆的一个后果。

您告诉我们您使用的是 GCC 7.3.1，但未解决的第一个引用是__asan_init_v1：

/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libasan_preinit.o:(.preinit_array+0x0) : undefined reference to « __asan_init_v1

显示gcc调用链接与-fsanitize=address链接地址清理程序初始化代码的链接来自 GCC 4.8.5 的安装。

在 GCC 7 中，该文件libasan_preinit.o没有引用__asan_init_v1，正如我刚才在笔记本电脑上看到的那样：

$ nm /usr/lib/gcc/x86_64-linux-gnu/7/libasan_preinit.o
                 U __asan_init
0000000000000000 D __local_asan_preinit

它调用__asan_init，它确实在工具链的 中定义libasan：

$ nm -D /usr/lib/gcc/x86_64-linux-gnu/7/libasan.so | grep __asan_init
00000000000ecdb0 T __asan_init

在另一方面，在GCC 4.8.5，libasan并没有定义功能__asan_init ，并没有定义__asan_init_v1：

:~/Downloads/gcc-4.8.5$ grep -r '__asan_init_v'
gcc/ChangeLog:  * sanitizer.def: Rename __asan_init to __asan_init_v1.
gcc/sanitizer.def:DEF_SANITIZER_BUILTIN(BUILT_IN_ASAN_INIT, "__asan_init_v1",
libsanitizer/asan/asan_interface_internal.h:  void __asan_init_v1() SANITIZER_INTERFACE_ATTRIBUTE;
libsanitizer/asan/asan_interface_internal.h:  #define __asan_init __asan_init_v1

在那里，__asan_init只是一个内部#define别名真正的函数__asan_init_v1，按照libsanitizer/asan/asan_interface_internal.h，但在 GCC 7 的那个文件中

  // This function should be called at the very beginning of the process,
  // before any instrumented code is executed and before any call to malloc.
  SANITIZER_INTERFACE_ATTRIBUTE void __asan_init();

正如 报道的那样，它是一个真正的函数nm。

因此，证据的重点是您正在链接libasanGCC 7.3.1 的链接，但也链接 GCC 4.8.5 的库初始化代码。我不知道你是如何进入这个 GCC 版本混搭的——据我所知，这可能是一个打包错误——但你必须修复它才能解决这些链接失败。