Skillshub Code Coverage with gcov

Add gcov code coverage instrumentation to C/C++ projects

install

source · Clone the upstream repo

git clone https://github.com/ComeOnOliver/skillshub

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/ComeOnOliver/skillshub "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/gadievron/raptor/gcov-coverage" ~/.claude/skills/comeonoliver-skillshub-code-coverage-with-gcov && rm -rf "$T"

manifest: skills/gadievron/raptor/gcov-coverage/SKILL.md

source content

Code Coverage with gcov

Purpose

Instrument C/C++ programs with gcov to measure test coverage.

How It Works

Build with Coverage

gcc --coverage -o program source.c

Run Program

./program
# Creates .gcda files with execution data

Generate Reports

Text report:

gcov source.c
# Creates source.c.gcov with line-by-line coverage

HTML report:

gcovr --html-details -o coverage.html

Coverage Flags

--coverage

(shorthand for

-fprofile-arcs -ftest-coverage -lgcov

)

Add to both
```
CFLAGS
```
and
```
LDFLAGS
```

Build System Integration

Makefile

ENABLE_COVERAGE ?= 0
ifeq ($(ENABLE_COVERAGE),1)
    CFLAGS += --coverage
    LDFLAGS += --coverage
endif

CMake

option(ENABLE_COVERAGE "Enable coverage" OFF)
if(ENABLE_COVERAGE)
    add_compile_options(--coverage)
    add_link_options(--coverage)
endif()

When User Requests Coverage

Steps

Detect build system (Makefile/CMake/other)
Add
```
--coverage
```
to CFLAGS and LDFLAGS
Clean previous build:
```
make clean
```
or
```
rm -f *.gcda *.gcno
```

Build with coverage:

make ENABLE_COVERAGE=1

cmake -DENABLE_COVERAGE=ON

Run tests:
```
make test
```
or
```
./test_suite
```

Generate report:

gcovr --html-details coverage.html --print-summary

Present summary and path to HTML report

Output

Text (.gcov files):

        -:    0:Source:main.c
        5:   42:    int x = 10;
    #####:   43:    unused_code();

```
5:
```
= executed 5 times
```
#####:
```
= not executed
```
-:
```
= non-executable

HTML: Interactive report with color-coded coverage

Metrics

Line coverage: Executed lines / total lines
Branch coverage: Taken branches / total branches
Function coverage: Called functions / total functions

Target: 80%+ line coverage, 70%+ branch coverage