XCode 5.1 Unit Test Coverage Analysis Fails On Files Using Blocks

The problem is in the LCOV 1.10 geninfo script. It tests for the current version of gcov. It does this by parsing the version string. Since gcov now points to llvm-cov, the version string is parsed incorrectly.

The solution is to modify geninfo’s get_gcov_version() subroutine. In line 1868, change -v to --version. Then replace line 1874 with:

if ($version_string =~ m/LLVM/){    info("Found llvm-cov\n");    $result = 0x40201;}elsif ($version_string =~ /(\d+)\.(\d+)(\.(\d+))?/)

The modified subroutine should look like this:

sub get_gcov_version(){    local *HANDLE;    my $version_string;    my $result;    open(GCOV_PIPE, "-|", "$gcov_tool --version")        or die("ERROR: cannot retrieve gcov version!\n");    $version_string = <GCOV_PIPE>;    close(GCOV_PIPE);    $result = 0;    if ($version_string =~ m/LLVM/)    {        info("Found llvm-cov\n");        $result = 0x40201;    }    elsif ($version_string =~ /(\d+)\.(\d+)(\.(\d+))?/)    {        if (defined($4))        {            info("Found gcov version: $1.$2.$4\n");            $result = $1 << 16 | $2 << 8 | $4;        }        else        {            info("Found gcov version: $1.$2\n");            $result = $1 << 16 | $2 << 8;        }    }    return ($result, $version_string);}

^{NOTE: Make sure --gcov-tool is not set to gcov-4.2.}

Rather than modifying geninfo I created an llvm-cov-wrapper script and used lcov's --gcov-tool command line option:

#!/bin/bash# llvm-cov wrapper to make it behave more like gcovif [ "$1" = "-v" ]; then    echo "llvm-cov-wrapper 4.2.1"    exit 0else    /usr/bin/gcov $*fi

Actually I noticed that lcov is invoking gcov with -b option and gcov-4.2 will crash on this option (raise segmentation fault). If I remove the -b option from getinfo, then even though it still shows some error info, the gcov file can still be generated.

That is probably why coverstory can still give coverage output. So I guess the workaround is to remove -b option from lcov. And also as you suggested, ignore the error in getinfo