I am working on porting an open source perl program to windows and I think I have only one hurdle left to get over. The tool calls gcov to do some analysis and produce and output file that it brings in. From the command line I can invoke gcov like: 
gcov c:/path/to/file.gcda -o relative/path/to/source -b

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gcov then produces a .gcov file ./file.cpp.gcov using the following code: 
$gcov_error = system_no_output(1, $gcov_tool, $da_filename, "-o", 
$object_dir, "-b");

sub system_no_output($@)
{
    my $mode = shift;
    my $result;
    local *OLD_STDERR;
    local *OLD_STDOUT;

    # Save old stdout and stderr handles
    ($mode & 1) && open(OLD_STDOUT, ">>&STDOUT");
    ($mode & 2) && open(OLD_STDERR, ">>&STDERR");

    # Redirect to /dev/null
    ($mode & 1) && open(STDOUT, ">/dev/null");
    ($mode & 2) && open(STDERR, ">/dev/null");
 
    system(@_);
    $result = $?;

    # Close redirected handles
    ($mode & 1) && close(STDOUT);
    ($mode & 2) && close(STDERR);

    # Restore old handles
    ($mode & 1) && open(STDOUT, ">>&OLD_STDOUT");
    ($mode & 2) && open(STDERR, ">>&OLD_STDERR");
 
    return $result;
}

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gcov all of a sudden end up creating a file called ./relative#path#to#source#file.cpp.gcov What is the difference between running this on the command line and calling system? I know that perl will try and parse it through the command line if there is only 1 parameter.. however there is always more. at first I thought it was a gcov bug but I can run it manually.

update: I found the issue. There was a branch in the code that I was unaware I was taking. Apparently the '--preserve-paths' option in my windows build of was causing the file name mangling.

In reply to system() Creating Different Results than Commandline Operation. by kazeits

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