[英]clang doesn't know std::atomic_bool, but XCode does
I'm trying to compile C++11 code that declares a variable of type std::atomic_bool. 我正在尝试编译声明类型为std :: atomic_bool的变量的C ++ 11代码。 This is on Mac OS 10.8.2 with clang: 这是在Mac OS 10.8.2上使用clang:
clang --version
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix
clang complains about std::atomic_bool: clang抱怨std :: atomic_bool:
clang++ -c -stdlib=libc++ -msse4 -std=c++11 -Wno-unused-parameter -I. -o query.o query.cpp
In file included from query.cpp:1:
[...]
./threadutils.h:33:10: error: no type named 'atomic_bool' in namespace 'std'; did you mean 'atomic_long'?
std::atomic_bool work;
However, the same file compiles fine in an XCode project using the same compiler. 但是,使用相同的编译器在XCode项目中编译相同的文件。 So I assume I'm missing something in my manual compiler invocation. 所以我假设我在手动编译器调用中遗漏了一些东西。
I tried a few variations such as -std=c++0x
and -std=gnu++11
, to no avail. 我尝试了一些变体,如-std=c++0x
和-std=gnu++11
,但无济于事。
I figured it out. 我想到了。 Unfortunately I planted a false flag into my question: it didn't work in XCode either, I had a different version of the source file imported there. 不幸的是,我在我的问题中设置了一个错误的标志:它在XCode中也不起作用,我在那里导入了不同版本的源文件。
The problem was that C++11 defines "a named type atomic_bool
corresponding to the specified atomic<bool>
", but clang doesn't support that . 问题是C ++ 11定义了“与指定的atomic<bool>
对应的命名类型atomic_bool
”,但是clang不支持它 。
Renaming the type from atomic_bool
to atomic<bool>
fixed it. 将类型从atomic_bool
重命名为atomic<bool>
修复它。
I found the same problem. 我发现了同样的问题。 In my case I resolved it by including atomic: 在我的情况下,我通过包含原子来解决它:
#include <atomic>
static std::atomic_bool varname;
After this, I could call g++ with std=c++11 on a Linux (Ubuntu) as well as compile on XCode. 在此之后,我可以在Linux(Ubuntu)上使用std = c ++ 11调用g ++以及在XCode上编译。
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