gcc 4.9.2 bug in -Wmissing-field-initializers？ [英] gcc 4.9.2 bug in -Wmissing-field-initializers?
问题描述
我有一个问题在这段代码 - 可以复制1：1到一个cpp文件为了测试的行为：
I have an issue in this code - which can be copied 1:1 into a cpp file in order to test the behaving:
#include <atomic>
typedef struct
{
char sDateTime [20];
char sLogFileDirectory [300];
char sLogFileNameTemplate [300];
char sLogOutput [10][100];
std::atomic<bool> bReadyToFlush;
} LogEntries;
typedef struct
{
LogEntries leLogEntries [1] {};
} LogThreads;
使用gcc编译4.9.2 SLES 11 SP2 g ++ -std = c + +11 gcc-warning-bug.cpp -Wall -Wextra -c 我收到这些非常奇怪的警告：
Compiling with gcc 4.9.2 SLES 11 SP2 g++ -std=c++11 gcc-warning-bug.cpp -Wall -Wextra -c I receive these very strange warnings:
gcc-warning-bug.cpp:18:34: warning: missing initializer for member ‘LogEntries::sDateTime’ [-Wmissing-field-initializers]
LogEntries leLogEntries [1] {};
^
gcc-warning-bug.cpp:18:34: warning: missing initializer for member ‘LogEntries::sLogFileDirectory’ [-Wmissing-field-initializers]
gcc-warning-bug.cpp:18:34: warning: missing initializer for member ‘LogEntries::sLogFileNameTemplate’ [-Wmissing-field-initializers]
gcc-warning-bug.cpp:18:34: warning: missing initializer for member ‘LogEntries::sLogOutput’ [-Wmissing-field-initializers]
gcc-warning-bug.cpp:18:34: warning: missing initializer for member ‘LogEntries::bReadyToFlush’ [-Wmissing-field-initializers]
在此行中添加 {} / p>
Adding the {} initializer in this line
std::atomic<bool> bReadyToFlush {};
甚至g ++在第一个警告中抱怨 LogEntries :: sDateTime 然后警告消失。
even g++ is complaining in the 1st warning about LogEntries::sDateTime then the warnings are gone.
当我删除 std :: atomic< bool> code>行。代码很简单;当你有g ++ 4.9.2检查出来 - 这真的很奇怪。
The warning is also gone when I remove the std::atomic<bool> line. The code is very simple; when you have g++ 4.9.2 check it out - it is really very strange.
编辑：无论 LogEntries struct 我添加 {} 初始化程序的警告消失了。
Regardless to which LogEntries struct member I add the {} initializer the warnings are gone.
可以这个行为解释吗？对我来说，这是一个错误...
How can be this behaving explained? For me it is a bug...
PS：
我认为它是一个错误：
将此行中的数组说明符更改为1000 ：
PS: I consider it as a bug: Change the array specifier in this line to 1000:
LogEntries leLogEntries [1000] {};
g ++将产生5'000警告！
g++ will produce 5'000 warnings! I would suppose that it does not really make sense to repeat the warning for each array value.
推荐答案
更新：
UPDATE:
第一种情况现在由GNU确认是一个错误，但已在gcc 5.0中修复
ICE [内部编译器错误]现在位于错误数据库 GNU错误资料库
这似乎是一个错误。我现在在玩一些，我得到一个修改编译器消息gcc因为一个内部错误停止。
It seems to be a bug. I was now playing a bit around and I get after a modification the compiler message gcc stopped because of an internal error.
UPDATE：代码不能由gcc编译。编译器选项： g ++ -std = c ++ 11 gcc-warning-bug.cpp -Wall -Wextra -Werror -fno-strict-aliasing -fwrapv -fno-aggressive-loop- optimizations -c - 有些选项存在，因为GNU请求它的错误报告。
UPDATE: As requested the code which cannot be compiled by gcc. Compiler options: g++ -std=c++11 gcc-warning-bug.cpp -Wall -Wextra -Werror -fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations -c - some options are there because GNU requests it for a bug report.
#include <atomic>
class LogEntries
{
public:
char sDateTime [20];
std::atomic<bool> bReadyToFlush;
};
class LogThreads
{
public:
static LogEntries leLogEntries [10];
};
LogEntries LogThreads::leLogEntries [10] {};
编译器失败，输出结果如下：
Compiler fails with this output:
gcc-warning-bug.cpp:16:43: internal compiler error: in gimplify_init_constructor, at gimplify.c:4007
....
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
我将准备示例代码并提交给开发团队。在我的项目中，成员 leLogEntries 是静态的。
I will prepare the sample code and submit it to the developer team. In my project the member leLogEntries is static.
当你删除 std ::原子行然后它工作 - > std :: atomic 实现中的问题
When you remove the std::atomic line then it works --> problem in the std::atomic implementation?
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