[英]How can I link to thread sanitizer with a newer version of clang than the system provides?
I download normally the latest clang version from their website . 我通常从他们的网站上下载最新的clang版本。 This helps me use the latest version of C++ as doing this with gcc is not really possible.
这可以帮助我使用最新版本的C ++,因为用gcc这样做实际上是不可能的。 I just get the binaries for my Ubuntu/Debian and I'm good to go.
我刚刚得到了我的Ubuntu / Debian的二进制文件,我很高兴。
For me, linking with tsan
library (thread-sanitizer library) has never been something simple. 对我来说,与
tsan
库(线程清理程序库)链接从未如此简单。 I use insane measures in cmake to make it work. 我在cmake中使用了疯狂的措施使其工作。 Previously, when I used gcc from the system, this is what I did in cmake to make the link work correctly:
以前,当我从系统中使用gcc时,这就是我在cmake中所做的,以使链接正常工作:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -ltsan")
set(CMAKE_LINK_LIBRARY_FLAG "-ltsan -l")
which basically modifies the linking flags to link every little thing with tsan
. 它基本上修改了链接标志,将每个小东西与
tsan
链接。 This has worked fine for a while, but to make it work, I should use gcc, the system's compiler. 这已经工作了一段时间了,但是要使其正常工作,我应该使用系统的编译器gcc。 If I try to link like this with clang 7, I get a segfault when I run my program.
如果我尝试使用clang 7链接,则在运行程序时会出现段错误。
So I searched for the available tsan
libraries that come with clang, and here's what I found: 因此,我搜索了clang附带的可用
tsan
库,这是我发现的内容:
user@machine:/opt/clang7$ find -iname "*tsan*"
./lib/clang/7.0.0/lib/linux/libclang_rt.tsan_cxx-x86_64.a
./lib/clang/7.0.0/lib/linux/libclang_rt.tsan-x86_64.a
./lib/clang/7.0.0/lib/linux/libclang_rt.tsan_cxx-x86_64.a.syms
./lib/clang/7.0.0/lib/linux/libclang_rt.tsan-x86_64.a.syms
./lib/clang/7.0.0/include/sanitizer/tsan_interface_atomic.h
./lib/clang/7.0.0/include/sanitizer/tsan_interface.h
There seems to be tsan libraries there. 那里似乎有tsan库。 I guess I gotta link to them.
我想我必须链接到他们。 How do I do that?
我怎么做?
This, doesn't seem to work: 这似乎不起作用:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -L/opt/clang7/lib/clang/7.0.0/lib/linux/ -lclang_rt.tsan_cxx-x86_64")
set(CMAKE_LINK_LIBRARY_FLAG "-L/opt/clang7/lib/clang/7.0.0/lib/linux/ -lclang_rt.tsan_cxx-x86_64 -l")
This doesn't work either: 这也不起作用:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -l:/opt/clang7/lib/clang/7.0.0/lib/linux/libclang_rt.tsan_cxx-x86_64.a")
set(CMAKE_LINK_LIBRARY_FLAG "-l:/opt/clang7/lib/clang/7.0.0/lib/linux/libclang_rt.tsan_cxx-x86_64.a -l")
I've tried a few other combinations. 我尝试了其他几种组合。 But None of them seem to work.
但是它们似乎都不起作用。 The errors I get are either linking errors or undefined references to some tsan components.
我得到的错误是链接错误或对某些tsan组件的未定义引用。
How can I link to tsan from the newest clang's prebuilt binaries? 如何从最新的clang的预编译二进制文件链接到tsan?
Setting the link flag for the compilation is a big no-no: 为编译设置链接标志是一个很大的禁忌:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread")
Then you need to do the same for the link flags as well: 然后,您还需要对链接标志执行相同的操作:
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=thread")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fsanitize=thread")
You can also change the target properties only: 您还可以仅更改目标属性:
set_target_properties(${TARGET} PROPERTIES
LINK_FLAGS -fsanitizer=thread
COMPILE_FLAGS -fsanitizer=thread)
Be aware that this overrides all flags (I don't remember if CMAKE_CXX_FLAGS
are also there, maybe not), you may want to retrieve the current ones and append these instead of removing everything. 请注意,这将覆盖所有标志(我不记得
CMAKE_CXX_FLAGS
是否也存在,也许不存在),您可能想检索当前标志并将其附加,而不是删除所有标志。
clang knows where its support libraries for sanitation are (as you said, these are tagged with a triple-like information and are not in the usual library folders, to avoid any contamination from other installs), and the full fsanitize=tsan
flag will make it pick up these versions. clang知道其卫生支持库在哪里(如您所说,这些库带有类似三重的信息标记,并且不在通常的库文件夹中,以避免其他安装造成的污染),并且完整的
fsanitize=tsan
标志将使它会选择这些版本。 Note that it's not -ltsan
, but a full option that will make clang pick up the proper backend in the path where its own sanitizers are. 请注意,它不是
-ltsan
,而是一个完整的选项,它将使clang在其自身的消毒剂所在的路径中拾取适当的后端。
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