Differential code coverage: genhtml - range error #408
Description
genhtml throws range error when the baseline source file had coverage data for lines with larger numbers than the size of the current version of the file.
Scenario: there is a refactor of a code, some functions/code are removed so those are no longer exists, but in the baseline .info file still has coverage data for it.
I can workaround it by using the --ignore-error range option, but I would assume this should work because the udiff.txt contains the information on the line changes.
I'm using the lcov 2.3.1.
The Error log
...
Processing file exampleRepo/methods/iterate.c (source code changed)
lines=7 hit=5 functions=1 hit=1 branches=4 hit=3
genhtml: ERROR: (range) /home/sok/Downloads/lcov-2.3.1/example/exampleRepo/methods/iterate.c contains only 38 lines but coverage data refers to line 48
(use "genhtml --ignore-errors range ..." to bypass this error)
make: *** [Makefile:177: test_differential] Error 1
Small reproducible example, using the "example" from lcov repository itself:
- copy paste the content below to the iterate.c file (baseline)
iterate.c
/*
* methods/iterate.c
*
* Calculate the sum of a given range of integer numbers.
*
* This particular method of implementation works by way of brute force,
* i.e. it iterates over the entire range while adding the numbers to finally
* get the total sum. As a positive side effect, we're able to easily detect
* overflows, i.e. situations in which the sum would exceed the capacity
* of an integer variable.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include "iterate.h"
int some_execution(int a);
int iterate_get_sum (int min, int max)
{
int i, total;
total = some_execution(max);
total = 0;
/* This is where we loop over each number in the range, including
both the minimum and the maximum number. */
for (i = min; i <= max; i++)
{
/* We can detect an overflow by checking whether the new
sum would exceed the maximum integer value. */
if (total > INT_MAX - i)
{
printf ("Error: sum too large!\n");
exit (1);
}
/* Everything seems to fit into an int, so continue adding. */
total += i;
}
return total;
}
int some_execution(int a)
{
return a+a;
}
- execute the
makefor the example project - see error