[cfe-dev] clang --version question.

[Daniel Dunbar]

Fine with me. However, the change should only be for --version, I
think the reason it is currently to stderr is that is what happens in
gcc when run as -v:
--
ddunbar at giles:tmp$ gcc --version > /dev/null
ddunbar at giles:tmp$ gcc -v > /dev/null
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc/gcc-5646~6/src/configure
--disable-checking --enable-werror --prefix=/usr --mandir=/share/man
--enable-languages=c,objc,c++,obj-c++
--program-transform-name=/^[cg][^.-]*$/s/$/-4.2/
--with-slibdir=/usr/lib --build=i686-apple-darwin10
--with-gxx-include-dir=/include/c++/4.2.1
--program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10
--target=i686-apple-darwin10
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5646)
--

 - Daniel

On Wed, Jul 15, 2009 at 5:11 PM, Jean-Daniel
Dupas<devlists at shadowlab.org> wrote:
> Hello,
>
> Is there a reason why clang outputs its version in stderr instead of stdout
> when passing the --version flag ?
> It prevents usage of this kind of script (used to detect type of parser in
> some projects):
>
> if $cc --version 2>/dev/null | grep -q clang; then …
>
> Note that this can be easily workaround by redirecting stderr in stdout
> instead of /dev/null, but I wonder if it's not simpler to change the driver
> to use stdout instead (see attached patch).
>
> Regards
> Jean-Daniel
>
>
>
>
>
>
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