[Interest] Size of libQt5Core in 5.3

[Peter Kümmel]

On 12.05.2014 23:29, Daniel Bowen wrote:
>
> If anyone has other things to add, please do.

Maybe it is worth to think about a Qt library which really only
provides essential stuff. What would such a library contain,
when all the "but the GUI needs it" was removed?

Peter

>
> Along the way, I have a couple of things that I'll send in separate e-mails
> (-no-feature-REGULAREXPRESSION not working and qtdiag building even though
> -no-gui specified).
>
> Thanks!
> -Daniel
>
> -----Original Message-----
> From: interest-bounces+qtmailinglist1=bowensite.com at qt-project.org
> [mailto:interest-bounces+qtmailinglist1=bowensite.com at qt-project.org] On
> Behalf Of Peter Kümmel
> Sent: Monday, May 12, 2014 2:48 AM
> To: interest at qt-project.org
> Subject: Re: [Interest] Size of libQt5Core in 5.3
>
> On 11.05.2014 09:20, Daniel Bowen wrote:
>> I have an embedded environment where we usenon-UI parts of Qt (Qt Core, Qt
> Networking)on an ARM host processor.
>>
>> We’ve been using 4.8.4for a little while. There’s some other changes
> comingto this code, and we’ve been looking to move
>> to5.xwith the upcoming 5.3. After working through several issues, I gotthe
> release candidate ofQt5.3compiledfor this
>> processor.  At first, libQt5Core.so.5.3.0was 6.6MB!  With 4.8.4,we were
> able to getlibQtCore4down to2.6 MB.
>
> Here libQt5Core needs 3905596b after stripping (ARM, GCC 4.8.2, -O3)  and
> with these options
>
> -no-c++11 -optimized-qmake -no-kms -no-cups -no-nis -no-iconv -system-zlib
> -system-pcre -no-pch -release -shared
> -largefile -opensource -confirm-license -gui -widgets --enable-linuxfb
> -no-directfb -no-xcb -opengl es2 -eglfs -openssl
> -no-fontconfig -no-gif -system-libjpeg -system-libpng -no-dbus -no-tslib
> -no-glib -no-icu -nomake examples
>
> For removing features you could also use 'qconfig' (now in the qttools
> package).
>
> http://qt-project.org/doc/qt-4.8/fine-tuning-features.html
>
> (Seems documentation got lost in Qt5)
>
> Peter
>
>>
>> So I started putting in -skip, -no-feature, etc.having features wewould
> still use, but other things stripped out.I also
>> had a mkspec use -Os to optimize for size.Usingsomething likethis:
>>
>> OPENSSL_LIBS="-L(pathfor openssl)-lssl -lcrypto" ./configure -release
> -opensource -prefix(pathfor
>> prefix)-extprefix(pathfor prefix)-shared -largefile -I(path for
> jpeg)-L(path for jpeg)-sysroot(path for
>> sysroot)-xplatform linux-arm_v5t_le-g++ -confirm-license -system-zlib
> -system-libpng -system-libjpeg -openssl-linked
>> -no-accessibility -no-freetype -no-harfbuzz -no-glib -no-gui -no-widgets
> -no-cups -no-iconv -no-evdev -no-icu
>> -no-fontconfig -no-pch -no-dbus -no-xcb -no-directfb -no-linuxfb -no-kms
> -no-opengl -nomake examples -nomake tests -skip
>> qtdeclarative -skip qtdoc -skip qtgraphicaleffects -skip qtlocation -skip
> qtquick1 -skip qtquickcontrols -skip qtscript
>> -skip qttranslations -skip qtwebkit -skip qtwebkit-examples -skip
> qtx11extras -skip qtxmlpatterns
>> -no-feature-TEXTHTMLPARSER -no-feature-TEXTODFWRITER -no-feature-CSSPARSER
> -no-feature-CONCURRENT
>> -no-feature-DRAGANDDROP -no-feature-SESSIONMANAGER -no-feature-SHORTCUT
> -no-feature-ACTION -no-feature-DOM
>> -no-feature-FILESYSTEMMODEL -no-feature-FILESYSTEMWATCHER
> -no-feature-ITEMVIEWS -no-feature-DIRMODEL
>> -no-feature-STANDARDITEMMODEL -no-feature-PROXYMODEL
> -no-feature-SORTFILTERPROXYMODEL -no-feature-IDENTITYPROXYMODEL
>> -no-feature-STRINGLISTMODEL -no-feature-LISTVIEW -no-feature-TABLEVIEW
> -no-feature-TREEVIEW -no-feature-DATAWIDGETMAPPER
>> -no-feature-COLUMNVIEW -no-feature-MOVIE -no-feature-IMAGEFORMAT_PPM
> -no-feature-IMAGEFORMAT_XBM
>> -no-feature-IMAGEFORMAT_XPM -no-feature-FREETYPE -no-feature-BIG_CODECS
> -no-feature-ICONV -no-feature-FTP
>> -no-feature-ACCESSIBILITY -no-feature-ANIMATION -no-feature-STATEMACHINE
> -no-feature-GESTURES -no-feature-DBUS
>> -no-feature-XMLSCHEMA-verbose
>>
>> It went down to 5.3 MB.5.3 MB was still too bit, so I went through the
> features from qfeatures.txt, and
>> did“-no-feature”for every single feature listed.  libQt5Core wouldn’t
> compile without LIBRARY, SETTINGS and
>> REGULAREXPRESSION, so I took the“-no-feature”out for those things.  Even
> with all of that removed, libQt5Core.so.5.3.0
>> was still4.3MBafterbeing stripped.  Thatwould have some things removed
> though that we want.
>>
>> Is there any way to get Qt Core to compile smaller, like under 3MB?Am I
> missing anything to
>> skipor“-no-xyz”or“-nomake”or“-no-feature”?  Why is libQt5Core.so.5.3.0 so
> much bigger than libQtCore4.so.4.8.4?
>>
>> We may just need to moveto 4.8.6 and leave it there instead of jumping
> onto 5.x.
>>
>> Thanks,
>>
>> -Daniel
>>
>>
>>
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>>
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