Function coverage incorrect when using lcov 1.x

[KholdStare]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (ac81a53 2024-12-02T00:48:39.714560304Z)

What command(s) is the bug in?

forge coverage

Operating System

Linux

Describe the bug

After commit #9438, lcov 1.x sees double the number of total function, so function coverage is always less than 50%.

Repo that reproduces the issue: https://github.com/KholdStare/foundry-lcov-bug

CI run in that repo that fails, and shows 4 functions from lcov summary when there are only 2: https://github.com/KholdStare/foundry-lcov-bug/actions/runs/12128532756/job/33815097436

The reproduction is based off of running foundry init and running coverage. See the script: https://github.com/KholdStare/foundry-lcov-bug/blob/main/run_coverage.sh