Mixing
How can I lint C++ code to find all unused return values?
I would like to statically inspect all calls to non-void functions where the return value is not used.
In effect this would be like applying __attribute__ ((warn_unused_result)) to all non-void functions, but of course for a large project that is not practical to do.
Is there any static analysis tool that can provide this information?
c++ static-analysis
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
|
show 9 more comments
I would like to statically inspect all calls to non-void functions where the return value is not used.
In effect this would be like applying __attribute__ ((warn_unused_result)) to all non-void functions, but of course for a large project that is not practical to do.
Is there any static analysis tool that can provide this information?
c++ static-analysis
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
1
compile withgcc -Wall, you are gonna get warnings for all those occurances
– RoiHatam
May 5 '17 at 18:52
2
@Roi No, you won't get any warnings about that.
– Neil Butterworth
May 5 '17 at 18:55
1
That's not an unused return value, it's no value being returned. The two things are completely different.
– Neil Butterworth
May 5 '17 at 18:59
2
@RoiHatam That's something different. That when the function itself forget to return a value. What we have here is when the caller of the function doesn't use its returned value.
– Galik
May 5 '17 at 19:00
1
That's quite useless. Forprintffor example one typically does not test the result and there are a lot of other functions one does not use the result, although they return one. "but of course for a large project that is not practical to do." - That's a wrong presumption. It is of course the best and correct way to do so! Why do you assume it is not possible? For a single function one knows best if the result is more "informative" or always has to be checked.
– too honest for this site
May 5 '17 at 21:22
|
show 9 more comments
I would like to statically inspect all calls to non-void functions where the return value is not used.
In effect this would be like applying __attribute__ ((warn_unused_result)) to all non-void functions, but of course for a large project that is not practical to do.
Is there any static analysis tool that can provide this information?
c++ static-analysis
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
I would like to statically inspect all calls to non-void functions where the return value is not used.
In effect this would be like applying __attribute__ ((warn_unused_result)) to all non-void functions, but of course for a large project that is not practical to do.
Is there any static analysis tool that can provide this information?
c++ static-analysis
c++ static-analysis
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
edited May 5 '17 at 21:58
Nicholas Bishop
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
asked May 5 '17 at 18:51
Nicholas BishopNicholas Bishop
609513
609513
1
compile withgcc -Wall, you are gonna get warnings for all those occurances
– RoiHatam
May 5 '17 at 18:52
2
@Roi No, you won't get any warnings about that.
– Neil Butterworth
May 5 '17 at 18:55
1
That's not an unused return value, it's no value being returned. The two things are completely different.
– Neil Butterworth
May 5 '17 at 18:59
2
@RoiHatam That's something different. That when the function itself forget to return a value. What we have here is when the caller of the function doesn't use its returned value.
– Galik
May 5 '17 at 19:00
1
That's quite useless. Forprintffor example one typically does not test the result and there are a lot of other functions one does not use the result, although they return one. "but of course for a large project that is not practical to do." - That's a wrong presumption. It is of course the best and correct way to do so! Why do you assume it is not possible? For a single function one knows best if the result is more "informative" or always has to be checked.
– too honest for this site
May 5 '17 at 21:22
|
show 9 more comments
1
compile withgcc -Wall, you are gonna get warnings for all those occurances
– RoiHatam
May 5 '17 at 18:52
2
@Roi No, you won't get any warnings about that.
– Neil Butterworth
May 5 '17 at 18:55
1
That's not an unused return value, it's no value being returned. The two things are completely different.
– Neil Butterworth
May 5 '17 at 18:59
2
@RoiHatam That's something different. That when the function itself forget to return a value. What we have here is when the caller of the function doesn't use its returned value.
– Galik
May 5 '17 at 19:00
1
That's quite useless. Forprintffor example one typically does not test the result and there are a lot of other functions one does not use the result, although they return one. "but of course for a large project that is not practical to do." - That's a wrong presumption. It is of course the best and correct way to do so! Why do you assume it is not possible? For a single function one knows best if the result is more "informative" or always has to be checked.
– too honest for this site
May 5 '17 at 21:22
1
1
compile with
gcc -Wall , you are gonna get warnings for all those occurances– RoiHatam
May 5 '17 at 18:52
compile with
gcc -Wall , you are gonna get warnings for all those occurances– RoiHatam
May 5 '17 at 18:52
2
2
@Roi No, you won't get any warnings about that.
– Neil Butterworth
May 5 '17 at 18:55
@Roi No, you won't get any warnings about that.
– Neil Butterworth
May 5 '17 at 18:55
1
1
That's not an unused return value, it's no value being returned. The two things are completely different.
– Neil Butterworth
May 5 '17 at 18:59
That's not an unused return value, it's no value being returned. The two things are completely different.
– Neil Butterworth
May 5 '17 at 18:59
2
2
@RoiHatam That's something different. That when the function itself forget to return a value. What we have here is when the caller of the function doesn't use its returned value.
– Galik
May 5 '17 at 19:00
@RoiHatam That's something different. That when the function itself forget to return a value. What we have here is when the caller of the function doesn't use its returned value.
– Galik
May 5 '17 at 19:00
1
1
That's quite useless. For
printf for example one typically does not test the result and there are a lot of other functions one does not use the result, although they return one. "but of course for a large project that is not practical to do." - That's a wrong presumption. It is of course the best and correct way to do so! Why do you assume it is not possible? For a single function one knows best if the result is more "informative" or always has to be checked.– too honest for this site
May 5 '17 at 21:22
That's quite useless. For
printf for example one typically does not test the result and there are a lot of other functions one does not use the result, although they return one. "but of course for a large project that is not practical to do." - That's a wrong presumption. It is of course the best and correct way to do so! Why do you assume it is not possible? For a single function one knows best if the result is more "informative" or always has to be checked.– too honest for this site
May 5 '17 at 21:22
|
show 9 more comments
2 Answers
2
active
oldest
votes
Cppcheck is a command-line tool that tries to detect bugs that your C/C++ compiler doesn't see, it also includes a web based report generator.
answered Jan 1 at 18:12
sbhsbh
416
add a comment |
I think there are software can do this like DevExtreme and in social.msdn.microsoft.com in the answer for this question how-to-get-a-warning-for-an-unused-return-value? they mention that Premium and Ultimate versions of visual studio has some tools.
Read this:https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355715a-5af7-4a2b-8aa0-bc2112eaa911/how-to-get-a-warning-for-an-unused-return-value?forum=vclanguage
and this mandatory-error-codes-revisited from: http://www.drdobbs.com/cpp/mandatory-error-codes-revisited/191601612
answered Jan 1 at 18:27
i_thi_th
1,1851719
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Cppcheck is a command-line tool that tries to detect bugs that your C/C++ compiler doesn't see, it also includes a web based report generator.
answered Jan 1 at 18:12
sbhsbh
416
add a comment |
Cppcheck is a command-line tool that tries to detect bugs that your C/C++ compiler doesn't see, it also includes a web based report generator.
answered Jan 1 at 18:12
sbhsbh
416
add a comment |
Cppcheck is a command-line tool that tries to detect bugs that your C/C++ compiler doesn't see, it also includes a web based report generator.
answered Jan 1 at 18:12
sbhsbh
416
Cppcheck is a command-line tool that tries to detect bugs that your C/C++ compiler doesn't see, it also includes a web based report generator.
answered Jan 1 at 18:12
sbhsbh
416
answered Jan 1 at 18:12
sbhsbh
416
answered Jan 1 at 18:12
sbhsbh
416
answered Jan 1 at 18:12
sbhsbh
416
416
add a comment |
add a comment |
I think there are software can do this like DevExtreme and in social.msdn.microsoft.com in the answer for this question how-to-get-a-warning-for-an-unused-return-value? they mention that Premium and Ultimate versions of visual studio has some tools.
Read this:https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355715a-5af7-4a2b-8aa0-bc2112eaa911/how-to-get-a-warning-for-an-unused-return-value?forum=vclanguage
and this mandatory-error-codes-revisited from: http://www.drdobbs.com/cpp/mandatory-error-codes-revisited/191601612
answered Jan 1 at 18:27
i_thi_th
1,1851719
add a comment |
I think there are software can do this like DevExtreme and in social.msdn.microsoft.com in the answer for this question how-to-get-a-warning-for-an-unused-return-value? they mention that Premium and Ultimate versions of visual studio has some tools.
Read this:https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355715a-5af7-4a2b-8aa0-bc2112eaa911/how-to-get-a-warning-for-an-unused-return-value?forum=vclanguage
and this mandatory-error-codes-revisited from: http://www.drdobbs.com/cpp/mandatory-error-codes-revisited/191601612
answered Jan 1 at 18:27
i_thi_th
1,1851719
add a comment |
I think there are software can do this like DevExtreme and in social.msdn.microsoft.com in the answer for this question how-to-get-a-warning-for-an-unused-return-value? they mention that Premium and Ultimate versions of visual studio has some tools.
Read this:https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355715a-5af7-4a2b-8aa0-bc2112eaa911/how-to-get-a-warning-for-an-unused-return-value?forum=vclanguage
and this mandatory-error-codes-revisited from: http://www.drdobbs.com/cpp/mandatory-error-codes-revisited/191601612
answered Jan 1 at 18:27
i_thi_th
1,1851719
I think there are software can do this like DevExtreme and in social.msdn.microsoft.com in the answer for this question how-to-get-a-warning-for-an-unused-return-value? they mention that Premium and Ultimate versions of visual studio has some tools.
Read this:https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355715a-5af7-4a2b-8aa0-bc2112eaa911/how-to-get-a-warning-for-an-unused-return-value?forum=vclanguage
and this mandatory-error-codes-revisited from: http://www.drdobbs.com/cpp/mandatory-error-codes-revisited/191601612
answered Jan 1 at 18:27
i_thi_th
1,1851719
answered Jan 1 at 18:27
i_thi_th
1,1851719
answered Jan 1 at 18:27
i_thi_th
1,1851719
answered Jan 1 at 18:27
i_thi_th
1,1851719
1,1851719
add a comment |
add a comment |
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1
compile with
gcc -Wall, you are gonna get warnings for all those occurances– RoiHatam
May 5 '17 at 18:52
2
@Roi No, you won't get any warnings about that.
– Neil Butterworth
May 5 '17 at 18:55
1
That's not an unused return value, it's no value being returned. The two things are completely different.
– Neil Butterworth
May 5 '17 at 18:59
2
@RoiHatam That's something different. That when the function itself forget to return a value. What we have here is when the caller of the function doesn't use its returned value.
– Galik
May 5 '17 at 19:00
1
That's quite useless. For
printffor example one typically does not test the result and there are a lot of other functions one does not use the result, although they return one. "but of course for a large project that is not practical to do." - That's a wrong presumption. It is of course the best and correct way to do so! Why do you assume it is not possible? For a single function one knows best if the result is more "informative" or always has to be checked.– too honest for this site
May 5 '17 at 21:22