I am building an app using Closure Library, OL3 and Proj4js.
Now I want to compile project with ADVANCED_OPTIMIZATIONS in closure compiler, I don't want to load all OL3 build and all closure library scripts but only those I use.
I read something about externs and exports on closure library site, but still I don't know how to use it.
Can anyone tell me where I can find good tutorial about this or tell me how to do it?
Sorry for my bad English.
The question is quite old, but still: There is now a tutorial explaining how to compile your application together with OpenLayers:
http://openlayers.org/en/master/doc/tutorials/closure.html
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THe blazor docs show a trivial example https://learn.microsoft.com/en-us/aspnet/core/blazor/webassembly-native-dependencies?view=aspnetcore-6.0 where the c code is in one file. I made my own version of that and got it to work, but now I want to compile something that has multiple files, has non trivial source tree structure, makefile etc.
You have to use Emscripten (version 2.0.23) to compile all dependencies to wasm, and then link them, which is the tool that NET also uses to compile your C source.
Emscripten supports make & cmake so you can change the make files to use emcc instead and rebuild the project.
Im also asking about similar issue but more library specific, perhaps the sources there can provide you with some help.
I have an executable in Ada compiled with gprbuild.the executable use some simple function (like sin e cos).This executable is operating in a App binded to a POS (Partition Operating System) designed with vxwork. Once recompiled the whole process it appears a bunch of multiple function declaration errors between the POS_API.o and the ada executable (hello.o) . These functions (sin, cos, ...) are all in the same library. Unfortunately the most easy solution to de-reference all this function in POS is not permitted (bound of design).Any suggestions on how to compile or proceed?
Is this any possibility to compile without a specific library or some function in order to avoid the multiple reference error?
I'm afraid this isn't really an answer: largely because it's more than ten years since I worked with VxWorks and Ada, and things have got a bit hazy. Also, it's a bit long for a comment on your question
As I used it, VxWorks comes with a whole suite of software that you configure to hold just the components you need into your kernel: in this case, that would presumably include the maths package, functions like sin(), as well as the OS functions like taskSpawn().
The Ada/VxWorks build process that we used generates a partially-linked object file, with references to sin(), taskSpawn() unresolved (I can't remember how this is achieved; if using GNU ld, maybe the -r or --relocatable switch?). When VxWorks loads this object file over the configured kernel, the unresolved references get resolved, and away we go.
Now, I don't know what sort of thing your POS_API does. Is it a skin over a configured VxWorks kernel? Does it load yoour Ada program itself? If it is itself a VxWorks program, how come it's exporting sin()?
I suspect that the problem is to do with the way you've linked your executable. Maybe you could show us your GPR file? Otherwise, I'm just whistling in the dark.
I am building an application with Lazarus where I use a sqlite database to store thousands of records. Right now I am linking to the sqlite library dynamically via the sqlite3.dll.
Is it possible to link to it statically? Where can I find the Lazarus compatible lib file to do that?
Note:
I only started using Lazarus and Free Pascal a month ago so something that might look very obvious to one, might not be for me. So bear with me a bit.
Cheers
Actual static linking is difficult since the TSQLite3Connection component is inherently designed to actively load the SQLite3 DLL. In other words, it's not linking against the library when you compile the program, the component is coded to dynamically load the DLL at run time.
If you are looking to have a totally self contained program, then you can accomplish this two different ways.
Create a new TSQLite3Connection component that links statically against sqlite3 instead of loading the DLL dynamically.
Include the sqlite3.dll as a resource in your program and have your program automatically deploy it before it runs.
Solution #1 is not trivial and not for the faint of heart. I've done it, and I intended to include a link to the component, but the result isn't stable. The problem is that you have to compile a static version of sqlite3, which isn't a real problem, but you have to do it with something like gcc under MinGW and that introduces issues. Compiling with gcc under MinGW means you have to then link in libgcc.a, and because FreePascal's internal linker doesn't know how to interpret stdcall symbols properly, you also have to link against MinGW's libkernel32.a, and libmsvcrt.a. The result just isn't stable. Crashes galore.
Solution #2 should be fairly easy, but the Lazarus maintainers make it a little hard. The part where you store the dll inside the executable as a resource is easy enough to do. And so is writing it out as a temp file. The problem is that you can't tell the TSQLite3Connection component where to find it after. So it looks in the executable's folder, or in system folders. Neither of which can necessarily be written to by the executable. The only place you can guarantee that your program will be able to write to is a temp folder. So what I did is created a new version of TSQLite3Connection component call TSQLite3DynConnection, meaning you can dynamically specify where the DLL is. I made a published property called ClientLibrary where you can specify the location of the dll (it doesn't have to end in .dll, so you can use system temp filename generation routines). You can get this component at: http://icculus.org/~kfitzner/misc/sqlite3dyndll.zip. It will compile against Lazarus 1.6.2 FP 3.0.0, or FP 1.0.6 / FP 2.6.0, which are the two versions I use.
I'll update this answer if I can get the statically linked version stable.
2 Dec 2016 update: I managed to get a static version stable.
I'm frustrated by the lack of flexibility in the Visual Studio project/solution, but I realized that now that it uses MSBUILD it might be quite powerful but just doesn't expose that to the IDE. So I took a look at MSBUILD docs and don't know where to start! I wish there was a Nutshell book for that. Is there any good tutorial someone could point me to?
More specifically, here is the kinds of things I want to do:
Run a utility pre-processor to generate .CPP and .H files, which are then used by a regular C++ project. There are multiple inputs (to figure dependencies of; specifically should know if a normal .h file it uses has changed) and multiple outputs (at least one .cpp and one .h file) that are used as files in another project.
FWIW, the most complex case involves using Qt in a "normal" C++ project that can be built using VS Express 2010 or MSBUILD directly from a script on a server. Since that is a common library, there might be some guides or whatever to help? Note that a VS plug-in is not useful for the building stage, but could be used to initially generate project files that then rely only on MSBUILD and stuff included with the source code.
Would somebody please point me in the right direction?
--John
It gets worse from there, but that's my first goal.
I found the kind of information I was looking for in a book MSBuild Trickery: 99 Ways to Bend the Build Engine to Your Will by Brian Kretzler.
In the first 18 pages I found a few key pieces of information that, along with the on-line documentations I've already gone through, helps clear things up enough to try tackling my project. Details of interest include the processing order of how MSBuild reads and operates on the things in the file, quick points on when wildcard in items are expanded and how to handle generated files, and how to see what's happening in some practical cases or even step in the debugger.
FWIW, I managed to attack my problem without using the murky ".targets"/rules files that I have yet to understand, but only using better documented/exampled features (in particular, a Target that has wildcard items doesn't care that the file name extension is not in any ".target"; is simple enough to copy from example and allows the files to be seen in the IDE Project and added to the list using the IDE; again, the FileExtension there just works OK.)
I've seen some reference to a collapseProperties option when compiling with the Google Closure Compiler, but I don't understand how to set it in an Ant build file.
Will someone please provide an example? Or some documentation that has examples?
Also, if I'm compiling with compilationLevel="advanced", is collapseProperties already true?
"collapseProperties" is one of standard optimization passes enabled in ADVANCED mode. It is not available as a separate command-line option or as part of the ANT support that is part of the compiler's source tree. It is configurable using the Java API, should you wish to change it.
It basically attempts to remove objects used as namespaces, simplifying further analysis and making additional optimization possible.
if you are using advanced mode collapsed is true by default.