https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110561
Bug ID: 110561
Summary: gcov counts closing bracket in a function as
executable, lowering coverage statistics
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: carlosgalvezp at gmail dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Created attachment 55481
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55481&action=edit
Line 18 wrongly reported as lacking code coverage
Hi!
We are using GCC trunk on Ubuntu 22.04
(d08f2e4f74583e27002368989bba197f8eb7f6d2).
Consider the following code example:
#include <vector>
#include <string>
std::string joinPath(std::vector<std::string> const& path_parts)
{
std::string path{};
for (auto const& path_part : path_parts)
{
if (!path.empty())
{
path += "/";
}
path += path_part;
}
return path;
}
int main()
{
std::vector<std::string> strings = {"foo", "bar"};
joinPath(strings);
}
Following this process (taken from here:
https://medium.com/@xianpeng.shen/use-gcov-and-lcov-to-perform-code-coverage-testing-for-c-c-projects-c85708b91c78)
to compute coverage:
$ g++ main.cpp --coverage -o main
$ ./main
$ gcov main.cpp
$ lcov --capture --directory . --output-file coverage.info
$ genhtml coverage.info --output-directory out
Leads to a coverage report that says that line 18 is missing code coverage,
which is incorrect since it's just the closing bracket of the function (see
attached picture).
I can see that things go wrong already at the gcov output, so it's not a
rendering/LCOV issue:
$ cat main.cpp.gcov
-: 0:Source:main.cpp
-: 0:Graph:main.gcno
-: 0:Data:main.gcda
-: 0:Runs:1
-: 1:#include <vector>
-: 2:#include <string>
-: 3:
1: 4:std::string joinPath(std::vector<std::string> const&
path_parts)
-: 5:{
1: 6: std::string path{};
3: 7: for (auto const& path_part : path_parts)
-: 8: {
2: 9: if (!path.empty())
-: 10: {
1: 11: path += "/";
-: 12: }
-: 13:
2: 14: path += path_part;
-: 15: }
-: 16:
1: 17: return path;
=====: 18:}
-: 19:
1: 20:int main()
-: 21:{
2: 22: std::vector<std::string> strings = {"foo", "bar"};
1: 23: joinPath(strings);
1: 24:}
This problem does not happen always, just on particular cases (I haven't been
able to establish a pattern).
Do you know what could be the problem? Thanks!
