https://bugs.llvm.org/show_bug.cgi?id=51663
Bug ID: 51663
Summary: llvm-cov does not handle path separator correctly on
Windows
Product: Runtime Libraries
Version: 12.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: libprofile library
Assignee: unassignedb...@nondot.org
Reporter: efa...@gmail.com
CC: llvm-bugs@lists.llvm.org
Specifically, the `SOURCE` argument for `llvm-cov show` does not work well on
Windows.
If I specify a directory in `SOURCES`, llvm-cov will find all files in that
directory, and use them to filter coverage data. The problem is that llvm-cov
compares the paths as if they were strings. On Windows, both “/” and “\” can be
used as path separator, and `C:\xyz` and `C:/xyz` should be treated as the same
path on Windows. Failing to do this may lead to incorrect report.
To reproduce, run this PowerShell script in an empty directory on Windows:
--------------------------------------------------------------------------------
echo "int main() {}" > main.cpp
$cwd = $(pwd).ToString()
$cwd = $cwd.Replace("\", "/") # Comment this line to see the exprectd result.
clang++ -fprofile-instr-generate -fcoverage-mapping "$cwd/main.cpp" -o main.exe
$env:LLVM_PROFILE_FILE="main.profraw"
.\main.exe
llvm-profdata merge -o main.profdata main.profraw
llvm-cov show --format html --instr-profile main.profdata main.exe . >
main.html
--------------------------------------------------------------------------------
I got an empty HTML report on my PC from running this script. You can also try
to comment `$cwd = $cwd.Replace("\", "/")` to get a correct report.
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