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List:       mjpeg-users
Subject:    Re: [Mjpeg-users] Manually setting host CPU for mjpegtools
From:       Bernhard Praschinger <shadowlord () utanet ! at>
Date:       2011-02-12 7:06:06
Message-ID: 4D56315E.3040103 () utanet ! at
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Hallo

>> LRN wrote:
>>> I'm building mjpegtools with mingw32 gcc 4.5.2 and msys.
>>> When i configure it as-is, it detects my cpu as core2 (which is correct)
>>> and compiles with -mcpu=core2 -mtune=core2
>>> It is commendable. However, i would like to compile a version that will
>>> run on any more-or-less contemporary device, which means either
>>> -mtune=i686 or -mtune=generic
>>> I've tried building with --host=i686-pc-mingw32 (that is how mingw32
>>> often identifies itself), but hit the problem with sigjmp_buf being
>>> undefined (googling for it didn't do any good), and generic-pc-mingw32
>>> fails outright, since `generic' is not a correct cpu.
>>> So, in the end i want two things:
>>> 1) -mtune=generic
>>> 2) undefined HAVE_X86_CPU, which will prevent sigjmp_buf-related code
>>> from being compiled
>>
>> Export the compiler options, that should work on Linux boxes:
>> export CFLAGS="-march=core2 -mtune=core2"
>>
>> adding the options to the configure script should also work:
>> ./configure CFLAGS="-mtune=generic -O2
[...]
> That answers the (1). What about (2)? CFLAGS certainly won't affect
> pre-processor definitions.
Sorry, but I have no Idea how to solve the sigjmp_buf problem.

auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: shadowlord@utanet.at
www: http://www.lysator.liu.se/~gz/bernhard

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