经常有人会在BBS和QQ群上大喊:怎么裁剪Qt,怎么安装那么困难啊。
每当我看见时,都是非常无奈,其实Qt有套良好的配置安装机制,跟大多数linux程序一样,典型的先configure,然后make,最后 make install三部曲。而如果要裁剪参数,其实可以在configure加上对应的参数来实现,通过合理的选择,完全可以做到满足项目的开发。对于嵌入式 开发来说,资源是极其重要的,这就要求我们应该对应不同的项目开发,对Qte进行不同的裁剪来实现。
其实,在前面的减少Qt编译时间暨简单Qt裁剪 已经对这个题目有了非常详细的概述,并且通过qconfig工具可以做到控件级的裁剪,但是如果能在 configure阶段,能搞清楚参数,我想对于开发也是有很大的帮助。
为了与时俱进,本人的例子都是参照qt-embedded-linux-opensource-src-4.5.x系列。
当进入解压好的源码包后,使用./configure –help命令,可以获得相应帮助,那我们只要选取参数部分看看就OK
Configure options:
The defaults (*) are usually acceptable. A plus (+) denotes a default value
that needs to be evaluated. If the evaluation succeeds,the feature is
included. Here is a short explanation of each option:
* -release ……….. Compile and link Qt with deBUGging turned off.
-deBUG …………. Compile and link Qt with deBUGging turned on.
-deBUG-and-release . Compile and link two versions of Qt,with and without
deBUGging turned on (Mac only).
-developer-build…. Compile and link Qt with Qt developer options (including auto-tests exporting)
-opensource……… Compile and link the Open-Source Edition of Qt.
-commercial……… Compile and link the Commercial Edition of Qt.
* -shared ………… Create and use shared Qt librarIEs.
-static ………… Create and use static Qt librarIEs.
* -no-fast ……….. Configure Qt normally by generating Makefiles for all
project files.
-fast ………….. Configure Qt quickly by generating Makefiles only for
library and subdirectory targets. All other Makefiles
are created as wrappers,which will in turn run qmake.
-no-largefile …… disables large file support.
+ -largefile ……… Enables Qt to access files larger than 4 GB.
* -no-exceptions ….. disable exceptions on compilers that support it.
-exceptions …….. Enable exceptions on compilers that support it.
-no-accessibility .. Do not compile Accessibility support.
* -accessibility ….. Compile Accessibility support.
-no-stl ………… Do not compile STL support.
* -stl …………… Compile STL support.
-no-sql-<driver> … disable sql <driver> entirely.
-qt-sql-<driver> … Enable a sql <driver> in the Qtsql library,by default
none are turned on.
-plugin-sql-<driver> Enable sql <driver> as a plugin to be linked to
at run time.
Possible values for <driver>:
[ db2 ibase MysqL oci odbc psql sqlite sqlite2 tds ]
-system-sqlite ….. Use sqlite from the operating system.
-no-qt3support ….. disables the Qt 3 support functionality.
* -qt3support …….. Enables the Qt 3 support functionality.
-no-xmlpatterns …. Do not build the QtXmlPatterns module.
+ -xmlpatterns ……. Build the QtXmlPatterns module.
QtXmlPatterns is built if a decent C++ compiler
is used and exceptions are enabled.
-no-phonon ……… Do not build the Phonon module.
+ -phonon ………… Build the Phonon module.
Phonon is built if a decent C++ compiler is used.
-no-phonon-backend.. Do not build the platform phonon plugin.
+ -phonon-backend….. Build the platform phonon plugin.
-no-svg ………… Do not build the SVG module.
+ -svg …………… Build the SVG module.
-no-webkit ……… Do not build the WebKit module.
+ -webkit ………… Build the WebKit module.
WebKit is built if a decent C++ compiler is used.
-no-scripttools …. Do not build the QtScriptTools module.
+ -scripttools ……. Build the QtScriptTools module.
-platform target … The operating system and compiler you are building
on (qws/linux-x86-g++).
See the README file for a List of supported
operating systems and compilers.
-no-mmx ………… Do not compile with use of MMX instructions.
-no-3dNow ………. Do not compile with use of 3DNow instructions.
-no-sse ………… Do not compile with use of SSE instructions.
-no-sse2 ……….. Do not compile with use of SSE2 instructions.
-qtnamespace <name> Wraps all Qt library code in ‘namespace <name> {…}’.
-qtlibinfix <infix> Renames all libQt*.so to libQt*<infix>.so.
-D <string> …….. Add an explicit define to the preprocessor.
-I <string> …….. Add an explicit include path.
-L <string> …….. Add an explicit library path.
-help,-h ………. display this information.
Third Party librarIEs:
-qt-zlib ……….. Use the zlib bundled with Qt.
+ -system-zlib ……. Use zlib from the operating system.
See http://www.gzip.org/zlib
-no-gif ………… Do not compile the plugin for GIF reading support.
* -qt-gif ………… Compile the plugin for GIF reading support.
See also src/plugins/imageformats/gif/qgifhandler.h
-no-libtiff …….. Do not compile the plugin for TIFF support.
-qt-libtiff …….. Use the libtiff bundled with Qt.
+ -system-libtiff …. Use libtiff from the operating system.
See http://www.libtiff.org
-no-libpng ……… Do not compile in PNG support.
-qt-libpng ……… Use the libpng bundled with Qt.
+ -system-libpng ….. Use libpng from the operating system.
See http://www.libpng.org/pub/png
-no-libmng ……… Do not compile the plugin for MNG support.
-qt-libmng ……… Use the libmng bundled with Qt.
+ -system-libmng ….. Use libmng from the operating system.
See http://www.libmng.com
-no-libjpeg …….. Do not compile the plugin for JPEG support.
-qt-libjpeg …….. Use the libjpeg bundled with Qt.
+ -system-libjpeg …. Use libjpeg from the operating system.
See http://www.ijg.org
-no-openssl …….. Do not compile support for OpenSSL.
+ -openssl ……….. Enable run-time OpenSSL support.
-openssl-linked …. Enabled linked OpenSSL support.
-ptmalloc ………. OverrIDe the system memory allocator with ptmalloc.
(Experimental.)
Additional options:
-make <part> ……. Add part to the List of parts to be built at make time.
(libs tools examples demos docs translations)
-nomake <part> ….. Exclude part from the List of parts to be built.
-R <string> …….. Add an explicit runtime library path to the Qt
librarIEs.
-l <string> …….. Add an explicit library.
-no-rpath ………. Do not use the library install path as a runtime
library path.
+ -rpath …………. link Qt librarIEs and executables using the library
install path as a runtime library path. Equivalent
to -R install_libpath
-continue ………. Continue as far as possible if an error occurs.
-verbose,-v ……. Print verbose information about each step of the
configure process.
-silent ………… Reduce the build output so that warnings and errors
can be seen more easily.
* -no-optimized-qmake … Do not build qmake optimized.
-optimized-qmake …… Build qmake optimized.
-no-nis ………… Do not compile NIS support.
* -nis …………… Compile NIS support.
-no-cups ……….. Do not compile CUPS support.
* -cups ………….. Compile CUPS support.
Requires cups/cups.h and libcups.so.2.
-no-iconv ………. Do not compile support for iconv(3).
* -iconv …………. Compile support for iconv(3).
-no-pch ………… Do not use @R_902_3013@ header support.
* -pch …………… Use @R_902_3013@ header support.
-no-dbus ……….. Do not compile the QtDBus module.
+ -dbus ………….. Compile the QtDBus module and dynamically load libdbus-1.
-dbus-linked ……. Compile the QtDBus module and link to libdbus-1.
-reduce-relocations ….. Reduce relocations in the librarIEs through extra
linker optimizations (Qt/X11 and Qt for Embedded linux only;
experimental; needs GNU ld >= 2.18).
-no-separate-deBUG-info . Do not store deBUG information in a separate file.
* -separate-deBUG-info …. Strip deBUG information into a separate .deBUG file.
Qt for Embedded linux only:
-xplatform target … The target platform when cross-compiling.
-no-feature-<feature> Do not compile in <feature>.
-feature-<feature> .. Compile in <feature>. The available features
are described in src/corelib/global/qfeatures.txt
-embedded <arch> …. This will enable the embedded build,you must have a
proper license for this switch to work.
Example values for <arch>: arm mips x86 generic
-armfpa …………. Target platform is uses the ARM-FPA floating point format.
-no-armfpa ………. Target platform does not use the ARM-FPA floating point format.
The floating point format is usually autodetected by configure. Use this
to overrIDe the detected value.
-little-endian …… Target platform is little endian (LSB first).
-big-endian ……… Target platform is big endian (MSB first).
-host-little-endian . Host platform is little endian (LSB first).
-host-big-endian …. Host platform is big endian (MSB first).
You only need to specify the endianness when
cross-compiling,otherwise the host
endianness will be used.
-no-freetype …….. Do not compile in Freetype2 support.
-qt-freetype …….. Use the libfreetype bundled with Qt.
* -system-freetype …. Use libfreetype from the operating system.
See http://www.freetype.org/
-qconfig local …… Use src/corelib/global/qconfig-local.h rather than the
default (full).
-depths <List> …… Comma-separated List of supported bit-per-pixel
depths,from: 1,4,8,12,15,16,18,24,32 and ‘all’.
-qt-decoration-<style> ….Enable a decoration <style> in the QtGui library,
by default all available decorations are on.
Possible values for <style>: [ styled windows default ]
-plugin-decoration-<style> Enable decoration <style> as a plugin to be
linked to at run time.
Possible values for <style>: [ default styled windows ]
-no-decoration-<style> ….disable decoration <style> entirely.
Possible values for <style>: [ styled windows default ]
-no-opengl ………. Do not support OpenGL.
-opengl <API> ……. Enable OpenGL ES support
With no parameter,this will attempt to auto-detect OpenGL ES 1.x
or 2.x. Use es1,es1cl or es2 for <API> to overrIDe auto-detection.
NOTE: A QGLScreen driver for the harDWare is required to support
OpenGL ES on Qt for Embedded linux.
-qt-gfx-<driver> … Enable a graphics <driver> in the QtGui library.
Possible values for <driver>: [ linuxfb transformed qvfb vnc multiscreen ]
-plugin-gfx-<driver> Enable graphics <driver> as a plugin to be
linked to at run time.
Possible values for <driver>: [ ahi directfb hybrID linuxfb powervr qvfb transformed vnc ]
-no-gfx-<driver> … disable graphics <driver> entirely.
Possible values for <driver>: [ linuxfb transformed qvfb vnc multiscreen ]
-qt-kbd-<driver> … Enable a keyboard <driver> in the QtGui library.
Possible values for <driver>: [ tty usb sl5000 yopy vr41xx qvfb ]
-plugin-kbd-<driver> Enable keyboard <driver> as a plugin to be linked to
at runtime.
Possible values for <driver>: [ linuxis sl5000 usb vr41xx yopy ]
-no-kbd-<driver> … disable keyboard <driver> entirely.
Possible values for <driver>: [ tty usb sl5000 yopy vr41xx qvfb ]
-qt-mouse-<driver> … Enable a mouse <driver> in the QtGui library.
Possible values for <driver>: [ pc bus linuxtp yopy vr41xx tslib qvfb ]
-plugin-mouse-<driver> Enable mouse <driver> as a plugin to be linked to
at runtime.
Possible values for <driver>: [ bus linuxis linuxtp pc tslib vr41xx yopy ]
-no-mouse-<driver> … disable mouse <driver> entirely.
Possible values for <driver>: [ pc bus linuxtp yopy vr41xx tslib qvfb ]
-iwmmxt ………… Compile using the iWMMXt instruction set
(available on some XScale cpus).
-no-glib ……….. Do not compile Glib support.
+ -glib ………….. Compile Glib support.
这么参数,看得头晕了,但是其实仔细分析下,就会发现这些参数大多数是不难的,意思是非常好了解。本人移植qte时,就是一个一个参数配置过来的,当然,有些是可以无视的。接下来,就容本菜菜为您一一解释。
我们可以发现,有的参数前面有*号,这就意味这如果我们什么也不做,直接配置编译的话,就会把这些参数默认进去。不过,如果什么也不做,那裁剪也无从说起了。为了便于分析,接下来,我就是以如下格式进行:
参数
解释。
-release
这个参数显而易见,就是编译Qt以发布版的模式进行,一般来说,最后系统完成后,库就应该是发布版。
-release
与上面对应,自然是调试版了,如果开发的话,可以选择它吧。
-deBUG-and-release
囧,上面那两个的儿子。
-developer-build
囧,我错了,开发者也可以用这个的,选了这个后,可以进行自动测试,不过还没去用过,以后可以研究研究。
-opensource
-commercial
这两个参数是指是编译是商业版本的,还是开源版本呢,视个人情况而定。
-shared
-static
这两个参数是指Qt的lib以动态还是静态编译生成,这自然也是视个人需要的。
-no-fast
-fast
这两个就很有关系,如果对自己的电脑性能很有信心,那就选第一个,那所有的工程文件都会生成到makefiles中,那编译的时间,估计可以看完变形金刚了。如果选第二个,那就加入子目录和库到makefiles,这样就能加快编译的速度。
-no-largefile
-largefile
顾名思义,支不支持大文件,一般来说,嵌入式里是不会有从超过4G的大文件的,那就选第一个吧。
-no-exceptions
-exceptions
计算机英语够好的人都该懂,这个自然就是异常情况,选则编译器支持抛出异常,否则不支持。
-no-accessibility
-accessibility
可访问性的支持,说实话,这个我真不知道有什么有用了。等哪天发现了,再来好好解释。
-no-stl
-stl
是都加入stl的支持,stl,这应该算是C++程序员应该都了解了,再不济,那也总听说过大名吧。
no-sql-<driver>
-qt-sql-<driver>
-plugin-sql-<driver>
这个可要好好说明下,一般来说,对于一个优秀的项目开发,数据库是必不可少的,qt也自带了大多数数据库驱动,可以完美地支持数据库的使用。对于数 据库的使用,我们可以直接qt驱动编译进去,或者以插件的形式编译进去。一般来说,最简单地就是直接编译进去,但使用插件形式的可以更加灵活,针对不同的 需求将驱动插件添加。其中,<>代表的是驱动名,如果我想直接添加sqlite的支持话,形式如下:-qt-sql-sqlite。其他名称 可以自己查看参数里,有详细地介绍。
-system-sqlite
sqlite真受欢迎啊,当然那么优秀的嵌入式数据库,本人也是基本使用它来进行开发。这个参数意思是使用 *** 作系统上的sqlite数据库,如果是不太会移植的,可以考虑直接使用qt自带的驱动。
-no-qt3support
-qt3support
这个也是简洁易懂,加不加对qt3的支持。
no-xmlpatterns
-xmlpatterns
选择对xml的支持,如果对网络无需求的话,就不用加了。
-no-phonon
-phonon
phonon是qt中处理多媒体的模块,比如放放视频什么来着,不过本人从没用过,也是根据需要选择的。
-no-phonon-backend
-phonon-backend
与上面类似,只不过这两是以插件的形式加入支持。
-no-svg
-svg
是否加入svg的支持,svg即可缩放矢量图形。
-no-webkit
-webkit
是否加入webkit的支持,这可是个好东西,不过如果跟网络不搭界的话,还是不支持吧。
-no-scripttools
-scripttools
是否加入脚本工具的支持,这对PHP等脚本工程师来说是个很棒的参数,但对于我这样菜鸟,就别提了。
-platform target
目标平台,这可是关键了,如果不注意的话,编译出来是x86上的话,哪怕是再牛的嵌入式工程师来也没法帮你移植到开发板上。通常,本人是linux-arm-g++。
-no-mmx
-no-3dNow
-no-sse
-no-sse2
这四个参数是针对cpu的指令集,老实说,我也不甚了解,不过,对于开发并不是影响很大。
-qtnamespace
把qt的库封装到命名空间,没啥重要用处,依个人爱好加吧。
-qtlibinfix
将所有的qt的.so库重命名,也没啥大用处。
好了,以上就是qt最基本的参数,接下来静待下篇吧囧。
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