Re: How to compile a soft same as the version realeased by fedora?

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On 03/19/2011 05:49 PM, stan wrote:
> On Sat, 19 Mar 2011 10:52:38 +0800
> GeeKer Wang<wwthunan@xxxxxxxxx>  wrote:
>
>>      I tried to compile OpenSceneGraph-2.8.3-3.fc14.rpm software, and
>> got a low efficient and large version of it. But the version from
>> fedora-repo works well.
>> eg. my version with frame rate<  10, while fedora-repo version with
>> frame rate ~=40.
>>
>> I have tried three ways:
>> 1. configure&&  make
>> 2. ccmake&&  make
>> 3. rpmbuild --recompile OpenSceneGraph-2.8.3-3.fc14.src.rpm
>> They resulted the same anyway. Especially, the rpmbuld way took 3G+
>> disk space, each .so file is much larger and each application is
>> slower. It's realy strange to me. I use the gcc/g++ 4.5.1 under
>> fedora 14.
>>
>>   So where the differences come from? Or where are the special places
>> in fedora's compiling environment? Any advice will be appreciated,
>> thx.
>>
> After all the discussion, I downloaded the src.rpm and unpacked it.  I
> couldn't see any reason for a problem in the .spec or the source.  I
> then ran the rpmbuild -bb command, and it is building the package.  This
> takes a long time on my system.  But I notice that it is building
> everything with the -g flag, that is with debugging support built in,
> even though it is supposed to be configured for Release and is using
> optimization (O2). Unfortunately, it uses cmake, which I'm not very
> familiar with, so finding where the problem is isn't straightforward
> for me.  This -g compile flag is probably the source of the difference
> you are seeing in frame rate.
>
> It is going to take as long, or longer, to compile this as a kernel.
> I'll post the size of the rpm when done.
Hi Stan,
The spec file will build multiple kernels, one of them is
with debuginfo, and that is what you saw (re: -g flag).

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