Mercurial > sdl-ios-xcode
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Von: Thomas Zimmermann
Betreff: [SDL] [PATCH] Make static variables const
Datum: Tue, 19 May 2009 19:45:37 +0200
Hi,
this is a set of simple changes which make some of SDL's internal static
arrays constant. The purpose is to shrink the number of write-able
static bytes and thus increase the number of memory pages shared between
SDL applications.
The patch set is against trunk@4513. Each of the attached patch files is
specific to a sub-system. The set is completed by a second mail, because
of the list's 40 KiB limit.
The files readelf-r4513.txt and readelf-const-patch.txt where made by
calling 'readelf -S libSDL.so'. They show the difference in ELF sections
without and with the patch. Some numbers measured on my x86-64:
Before
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000008170 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 00000000003045e0 001045e0
00000000000023d0 0000000000000000 WA 0 0 32
[23] .data PROGBITS 00000000003076e0 001076e0
0000000000004988 0000000000000000 WA 0 0 32
After
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000009a50 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 0000000000306040 00106040
0000000000002608 0000000000000000 WA 0 0 32
[23] .data PROGBITS 0000000000309360 00109360
0000000000002e88 0000000000000000 WA 0 0 32
The size of the write-able data section decreased considerably. Some
entries became const-after-relocation, while most of its content went
straight into the read-only data section.
Best regards, Thomas
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 03 Jun 2009 04:37:27 +0000 |
| parents | de622b7108bf |
| children |
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Building SDL with Borland's C++ compilers</title> <meta name="author" content="David Snopek and updated by Dominique Louis."> </head> <body> <xevol @newtonave.net=""> </xevol> <h1>Building SDL with Borland's C++ compilers. </h1> <b> by <a href="mailto:xevol@users.sourceforge.net"> David Snopek</a></b> and updated by <b><a href="mailto:Dominique@SavageSoftware.com.au">Dominique Louis</a></b> ( Last updated : 30th June 2003 ).<br> <br> These instructions cover how to compile SDL and its included test programs using either Borland <a href="#bcbwin">C++ Builder 5, 6 for Windows</a>, <a href="#k3">C++ Builder for Linux ( AKA Kylix 3 )</a> or the free <a href="#bccc">Borland C++ command-line compiler</a>. <br> <h3> <b> Extract the files </b> </h3> <p> Unzip the Borland.zip archive into <b>this</b> directory. Do not unzip it into any other directory because the makefiles ( *.mak ) and project files ( *.bpr ) use relative paths to refer to the SDL sources. This should create a directory named "Borland" inside of the top level SDL source directory. </p> <h3> <b><a name="bcbwin"></a> Using Borland C++ Builder 5, 6 for Windows </b> </h3> <p> Inside of the "Borland" directory there is a "bcb6" directory that contains a number of Builder project files. Double-click on the "libSDL.bpg" file icon. Once Builder has started click on the "<u>P</u>rojects" menu on the menu-bar and go down to "B<u>u</u>ild All Projects" option. <br> This will proceed to build SDL ( with Borland's calling convention ), SDLmain, and all the <a href="#tests">test programs</a>. Currently, all the <a href="#tests">test programs</a> are dynamically linked to Sam Lantinga's SDL.dll.</p> <p><b>NOTE :</b> Borland's "lib" format and Microsoft's "lib" format are incompatible. <br> If you wish to dynamically link to the SDL library supplied by Sam Lantinga in each release, I have created the correct *.libs for SDL 1.2.4 and they exist in the "/lib" directory.<br> If you would like to create the *.lib files yourself, you will need to make use of Borland's "implib.exe" utility.<br> </p> <p><tt>IMPLIB</tt> works like this: </p> <pre> IMPLIB (destination lib name) (source dll)<br></pre> <p> For example,</p> <pre> IMPLIB SDL.lib SDL.dll<br></pre> <p>This assumes that SDL.dll was compiled with Visual C++ or similar.<br> </p> <p>To learn more about the difference between Borland's and Microsoft's *.lib format please read the article <a href="http://www.bcbdev.com/articles/vcdll.htm">here</a>.<br> </p> <p> <b><br> NOTE :</b> The C++ Builder for Windows project format, is not compatible with the Kylix 3 project format, hence the reason why they are in separate directories.</p> <h3> <b><a name="bccc"></a> Using the free Borland C++ command-line compiler </b> </h3> <p> The free Borland compiler can be downloaded at no charge from <a href="http://www.borland.com/bcppbuilder/freecompiler/"> the Borland website </a>. Make sure that it is installed and properly configured. </p> <p> Open an MS-DOS Prompt. Change to the "Borland\freebcc" directory under the SDL source directory. Type "make -f SDL.mak" to build SDL and "make -f SDLmain.mak". There are also makefiles for all of the <a href="#tests">test programs</a>, if you wish to build them. All .exes and DLLs are created in the "test" SDL directory. Ify ou would like to create the DLL and all the test applications, I have thrown together a basic batchfile called "makeall.bat" which should create everything in the right order. </p> <h3> <b> Output files </b> </h3> No matter which compiler you used, three important files should have been produced: <ul> <li> SDL.dll ( Borland format ) </li> <li> SDL.lib ( Borland format ) </li> <li> SDLmain.lib ( Borland format ) </li> </ul> Both of the *.lib files will need to be added to all the projects that use SDL and SDL.dll must be placed some where the Windows dynamic linker can find it (either in your project directory or on the system path, C:\WINDOWS\SYSTEM). <h3> <b><a name="k3"></a> Using Borland C++ Builder for Linux ( AKA Kylix 3 ) </b> </h3> <p> Inside of the "Borland" directory there is a "k3" directory that contains a number of Builder project files. Double-click on the "libSDL.bpg" file icon. Once Builder has started click on the "<u>P</u>rojects" menu on the menu-bar and go down to "B<u>u</u>ild All Projects" option. This will proceed to build all the <a href="#tests">test programs</a>. <br> Linux users do not need *.lib files as the Shared Object is linked right into the project ( very neat actually, Windows should do this sort of thing as it is a lot easier for the developer ). <br> <b>NOTE :</b> The C++ Builder for Windows project format, is not compatible with the Kylix 3 project format, hence the reason why they are in separate directories.</p> <p> On Mandrake 8.1 the shared objects for SDL are located in the /usr/lib directory as libSDL_*.so and the Mesa OpenGL shared objects are located in /usr/X11R6/lib as libGL*.so<br> <br> So if your setup is different you may need to change the project file so that they re-link to the ones on your system.<br> <br> On Mandrake 8.1 the headers files are located at /usr/include/SDL/. So if you you have not installed the development RPMs ( usually named libSDL-devel* ) for SDL ( not included ) you may have to change the include directory within some of the projects.<br> </p> <h3> Known Problems</h3> The only known problem is that I ( Dominique Louis ), was unable to create the projects that rebuilt the SDL shared objects under Linux, due to time constraints and my lack of intimate knowledge of Linux. <h3><a name="tests"><b> Test programs </b> </a></h3> Some of the test programs require included media files ( *.wav; *.bmp etc ). All the test programs are now created in the "test" directory, where the media files are ( usually ) so they should be ready to go. <br> <br> <br> <br> </body> </html>