I’m writing a perl script that mimics gcc. This my script needs to process some stdout from gcc. The part for processing is done, but I can’t get the simple part working: how can I forward all the command line parameters as is to the next process (gcc in my case). Command lines sent to gcc tend to be very long and can potentially contain lots of escape sequences and I don’t want now to play that game with escaping and I know that it’s tricky to get it right on windows in complicated cases.
Basically,
gcc.pl some crazies\ t\\ "command line\"" and that gcc.pl has to forward that same command line to real gcc.exe (I use windows).
I do it like that: open("gcc.exe $cmdline 2>&1 |") so that stderr from gcc is fed to stdout and I my perl script processes stdout. The problem is that I can’t find anywhere how to construct that $cmdline.
Read up on the exec function and the system function in Perl.
If you provide either of these with an array of arguments (rather than a single string), it invokes the Unix execve() function or a close relative directly, without letting the shell interpret anything, exactly as you need it to do.