This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Feature request - a macro defined for GCC
Vincent Lefevre <vincent+gcc@vinc17.org> writes:
> On 2008-07-02 00:12:33 +0000, Joseph S. Myers wrote:
>> This internal binary no longer exists. Instead, there is a "cpp"
>> binary installed in the user binary directory, which calls the "cc1"
>> binary to do the same preprocessing as it does when compiling; that
>> is, it has the same effect as "gcc -E".
>
> Not exactly:
>
> vin% cpp -dM /dev/null | wc -l
> 128
> vin% gcc -E -dM /dev/null | wc -l
> gcc.real: /dev/null: linker input file unused because linking not done
> 0
>
> Is it a bug of "gcc -E"?
You need to tell gcc that /dev/null is a C file, since it does not have
a recognized extension.
$ gcc -E -dM -xc /dev/null | wc -l
120
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."