[cmake-developers] [CMake 0013955]: warning: assuming signed overflow does not occur when simplifying conditional to constant

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://cmake.org/Bug/view.php?id=13955 
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Reported By:                Mathieu Malaterre
Assigned To:                
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Project:                    CMake
Issue ID:                   13955
Category:                   (No Category)
Reproducibility:            have not tried
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2013-02-27 03:39 EST
Last Modified:              2013-02-27 03:39 EST
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Summary:                    warning: assuming signed overflow does not occur
when simplifying conditional to constant
Description: 
Cmake generates code which confuses gcc optimizer:


/home/mathieu/Perso/gdcm-gcc/Testing/Source/Common/Cxx/gdcmCommonTests.cxx: In
function ‘int main(int, char**)’:
/home/mathieu/Perso/gdcm-gcc/Testing/Source/Common/Cxx/gdcmCommonTests.cxx:218:
warning: assuming signed overflow does not occur when simplifying conditional to
constant [-Wstrict-overflow]

Code generated by cmake is:

...
  /* If partial match is requested.  */
  if(testToRun == -1 && ac > 1)
    {
    partial_match = (strcmp(av[1], "-R") == 0) ? 1 : 0;
    }
...


Looks like gcc thinks ac can be negative...
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Issue History 
Date Modified    Username       Field                    Change               
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2013-02-27 03:39 Mathieu MalaterreNew Issue                                    
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