I'm having a weird problem with running cl.exe that has me stumped. In a large VS2008 solution consisting of C/C++ projects, I have one project that runs some scripts to do some extra processing. The project consists of a pre-build event, which calls a Perl script (ActiveState Perl is on the machine). This Perl script then calls cl.exe with
/E to generate preprocessed output which gets redirected to a file. The line in Perl looks like this:
my $foo = `"\path\to\cl.exe" @args.rsp >out.txt 2>err.txt`;
args.rsp is a plain text file that contains a bunch of command line args for cl.exe, including
/E to get pre-processor output on stdout.
This exact command line works as expected when run from the VS2008 command prompt. Building the project also works fine on my Windows XP machine. However, on my new Windows 7 box, when I build the project, out.txt ends up blank. I should also add that on some of my coworker's Windows 7 boxes, it works fine, and on some others it doesn't.
Clearly there's some kind of configuration difference going on, but I'm at a loss as to what it may be. We've checked matching versions of VS2008 SP1 and ActiveState Perl. I've tried myriad workarounds within the perl script - using
system() instead of backticks, using
cl.exe /P to output to a file and then moving the file (the file is blank), unsetting the
VS_UNICODE_OUTPUT environment variable (no effect). Nothing has changed the behavior - output is generated when the command line is run manually, but not when it's run inside the pre-build event for this project.
Any ideas on what kind of configuration problem may be causing this? I'm pretty much out of avenues to pursue.