抑制 Cppcheck 中自动绑定事件处理程序从未使用过的警告
Suppress never-used warnings for auto-bound event handlers in Cppcheck
我使用 Cppcheck 1.70 检查 C++-Builder 项目。我收到很多这样的样式警告
[source\DbgRecMain.cpp:452]: (style) The function 'FormResize' is never used.
这些函数是 使用的事件处理程序，但不是明确地从 C++ 代码中使用：它们在加载相应的表单或数据模块后由 VCL 运行时绑定。自然地，Cppcheck 不检查 DFM 文件，这就是它无法检测事件和那里定义的处理程序之间的引用的原因。
我想到的一些选项
- 添加一些显式引用，但这必须手动维护。
- 抑制所有此类警告，但这会隐藏真正的死代码。
我如何专门禁止这些关于明显未使用的事件处理程序的警告？
CppCheck documentation中有一章是关于压制warnings/errors的。第 6.2 章尤其对您有用，因为您将能够根据需要抑制有关各个事件处理程序的警告：
Chapter 6. Suppressions
If you want to filter out certain errors you can suppress these.
6.1. Suppressing a certain error type
You can suppress certain types of errors. The format for such a suppression is one of:
[error id]:[filename]:[line]
[error id]:[filename2]
[error id]
The error id is the id that you want to suppress. The easiest way to get it is to use the --xml command line flag. Copy and paste the id string from the XML output. This may be * to suppress all warnings (for a specified file or files).
The filename may include the wildcard characters * or ?, which match any sequence of characters or any single character respectively. It is recommended that you use "/" as path separator on all operating systems.
6.1.1. Command line suppression
The --suppress= command line option is used to specify suppressions on the command line. Example:
cppcheck --suppress=memleak:src/file1.cpp src/
6.1.2. Listing suppressions in a file
You can create a suppressions file. Example:
// suppress memleak and exceptNew errors in the file src/file1.cpp
memleak:src/file1.cpp
exceptNew:src/file1.cpp
// suppress all uninitvar errors in all files
uninitvar
Note that you may add empty lines and comments in the suppressions file.
You can use the suppressions file like this:
cppcheck --suppressions-list=suppressions.txt src/
6.2. Inline suppressions
Suppressions can also be added directly in the code by adding comments that contain special keywords. Before adding such comments, consider that the code readability is sacrificed a little.
This code will normally generate an error message:
void f() {
char arr[5];
arr[10] = 0;
}
The output is:
# cppcheck test.c
Checking test.c...
[test.c:3]: (error) Array ’arr[5]’ index 10 out of bounds
To suppress the error message, a comment can be added:
void f() {
char arr[5];
// cppcheck-suppress arrayIndexOutOfBounds
arr[10] = 0;
}
Now the --inline-suppr flag can be used to suppress the warning. No error is reported when invoking cppcheck this way:
cppcheck --inline-suppr test.c
另请参阅以下问题了解更多详情：
How to use cppcheck's inline suppression filter option for C++ code?
Can I include cppcheck suppression within a function header?
我使用 Cppcheck 1.70 检查 C++-Builder 项目。我收到很多这样的样式警告
[source\DbgRecMain.cpp:452]: (style) The function 'FormResize' is never used.
这些函数是 使用的事件处理程序，但不是明确地从 C++ 代码中使用：它们在加载相应的表单或数据模块后由 VCL 运行时绑定。自然地，Cppcheck 不检查 DFM 文件，这就是它无法检测事件和那里定义的处理程序之间的引用的原因。
我想到的一些选项
- 添加一些显式引用，但这必须手动维护。
- 抑制所有此类警告，但这会隐藏真正的死代码。
我如何专门禁止这些关于明显未使用的事件处理程序的警告？
CppCheck documentation中有一章是关于压制warnings/errors的。第 6.2 章尤其对您有用，因为您将能够根据需要抑制有关各个事件处理程序的警告：
Chapter 6. Suppressions
If you want to filter out certain errors you can suppress these.
6.1. Suppressing a certain error type
You can suppress certain types of errors. The format for such a suppression is one of:
[error id]:[filename]:[line] [error id]:[filename2] [error id]The
error idis the id that you want to suppress. The easiest way to get it is to use the--xmlcommand line flag. Copy and paste theidstring from the XML output. This may be*to suppress all warnings (for a specified file or files).The
filenamemay include the wildcard characters*or?, which match any sequence of characters or any single character respectively. It is recommended that you use "/" as path separator on all operating systems.6.1.1. Command line suppression
The
--suppress=command line option is used to specify suppressions on the command line. Example:cppcheck --suppress=memleak:src/file1.cpp src/6.1.2. Listing suppressions in a file
You can create a suppressions file. Example:
// suppress memleak and exceptNew errors in the file src/file1.cpp memleak:src/file1.cpp exceptNew:src/file1.cpp // suppress all uninitvar errors in all files uninitvarNote that you may add empty lines and comments in the suppressions file. You can use the suppressions file like this:
cppcheck --suppressions-list=suppressions.txt src/6.2. Inline suppressions
Suppressions can also be added directly in the code by adding comments that contain special keywords. Before adding such comments, consider that the code readability is sacrificed a little.
This code will normally generate an error message:
void f() { char arr[5]; arr[10] = 0; }The output is:
# cppcheck test.c Checking test.c... [test.c:3]: (error) Array ’arr[5]’ index 10 out of boundsTo suppress the error message, a comment can be added:
void f() { char arr[5]; // cppcheck-suppress arrayIndexOutOfBounds arr[10] = 0; }Now the
--inline-supprflag can be used to suppress the warning. No error is reported when invoking cppcheck this way:cppcheck --inline-suppr test.c
另请参阅以下问题了解更多详情：
How to use cppcheck's inline suppression filter option for C++ code?
Can I include cppcheck suppression within a function header?