[Qemu-devel] Re: [PATCH] Check for sdl-config before calling it

[Måns Rullgård]

Stefan Weil <address@hidden> writes:

> Måns Rullgård schrieb:
>> Loïc Minier <address@hidden> writes:
>>
>>   
>>>         Hi
>>>
>>>  On systems were sdl-config isn't installed, ./configure triggers this
>>>  warning:
>>>     ./configure: 957: sdl-config: not found
>>>
>>>  The attached patch fixes the warning for me.
>>>
>>>    Thanks,
>>> -- 
>>> Loïc Minier
>>>
>>> From 94876939db7f46cf8d920e289d0d4f929d3b7df1 Mon Sep 17 00:00:00 2001
>>> From: =?UTF-8?q?Lo=C3=AFc=20Minier?= <address@hidden>
>>> Date: Sun, 17 Jan 2010 13:42:04 +0100
>>> Subject: [PATCH] Check for sdl-config before calling it
>>> MIME-Version: 1.0
>>> Content-Type: text/plain; charset=UTF-8
>>> Content-Transfer-Encoding: 8bit
>>>
>>> Check whether sdl-config is available before calling it, otherwise
>>> ./configure triggers a warning:
>>>     ./configure: 957: sdl-config: not found
>>>
>>> If neither the .pc file not sdl-config are present, disable SDL support.
>>>
>>> Signed-off-by: Loïc Minier <address@hidden>
>>> ---
>>>  configure |    4 +++-
>>>  1 files changed, 3 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/configure b/configure
>>> index 5631bbb..450e1a2 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -993,9 +993,11 @@ fi
>>>  if $pkgconfig sdl --modversion >/dev/null 2>&1; then
>>>    sdlconfig="$pkgconfig sdl"
>>>    _sdlversion=`$sdlconfig --modversion 2>/dev/null | sed 's/[^0-9]//g'`
>>> -else
>>> +elif which sdl-config >/dev/null 2>&1; then
>>>    sdlconfig='sdl-config'
>>>    _sdlversion=`$sdlconfig --version | sed 's/[^0-9]//g'`
>>> +else
>>> +  sdl=no
>>>  fi
>>>     
>>
>> "which" isn't a standard command.  Would simply 2>/dev/null do the
>> trick just as well?  If you really need to test for the existence of
>> something, use "type".
>>   
>
> "which" is already used several times in configure,

Then those should be fixed.

> so this would not make things worse.

One error does not justify another.

> A macro for all these tests might be a better solution.
> And that macro should use "type" or "type -t".

"type -t" is also not standard.  The standard "type" has no options.

In most cases the simpler solution is still probably to try the
command and let it fail.

-- 
Måns Rullgård
address@hidden