On 20 July 2004 13:39, Malcolm Wallace wrote:
> Using the glibc-2.2 (RedHat 7) Linux binary package of ghc-6.2.1,
> the following program:
>
> import System.Cmd
> main = do v <- system("ghc --version 2>&1")
> print v
>
> incorrectly gives
>
> ExitFailure 127
Are you sure your shell understands the '>&' syntax? Not all do.
> whereas with the glibc-2.3 Linux binary package of ghc-6.2.1, the
> same program correctly gives
>
> The Glorious Glasgow Haskell Compilation System, version 6.2.1
> ExitSuccess
Assuming you're using the same shell in both cases, this could indicate
a problem somewhere. Could you try strace on the binary?
> If we change the use of "system" to "rawSystem", both versions work
> fine.
>
> import System.Cmd
> main = do v <- rawSystem "ghc" ["--version","2>&1"]
> print v
>
> However, rawSystem is not portable across compiler implementations,
> whereas System.system is supposed to be.
The '2>&1' will be passed as a raw argument to GHC in this case.
Fortunately GHC is ignoring it.
Cheers,
Simon
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