| Issue |
120071
|
| Summary |
[llvm-cov] lcov-export generates invalid lcov files
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
zgtm
|
In certain cases, `llvm-cov export` exports lcov files, that seem to be invalid. They contain coverage information for the line after the final newline character.
For these lcov files, `genhtml` (part of the lcov project) will report the following error:
```
genhtml: ERROR: (range) /some/path/supp.h contains only 2 lines but coverage data refers to line 3
```
## Reproduce
`main.c`:
```C
#define FOO();
void foobar() {
#include "supp.h"
}
int main(){}
```
`supp.h`:
```C
#define BAR FOO
BAR()
```
Run
```sh
clang -o main -fcoverage-mapping -fprofile-instr-generate main.c
LLVM_PROFILE_FILE='main.profraw' ./main
llvm-profdata merge -sparse -o main.profdata main.profraw
llvm-cov export -format=lcov -instr-profile="" main > main.lcov
```
## Expected Behaviour
`main.lcov` does not contain
```
DA:3,0
```
For `supp.h`.
## Actual Behaviour
`main.lcov` contains
```
SF:/some/path/supp.h
…
DA:3,0
```
However, there is no line 3 in `supp.h`.
`genhtml main.lcov` will report "genhtml: ERROR: (range) /some/path/supp.h contains only 2 lines but coverage data refers to line 3"
## Additional Information
```
$ clang --version
Ubuntu clang version 19.1.1 (1ubuntu1)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
```
```
$ llvm-profdata --version
Ubuntu LLVM version 19.1.1
Optimized build.
```
```
$ llvm-cov --version
Ubuntu LLVM version 19.1.1
Optimized build.
```
On Kubuntu 24.10.a
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