GSL Installation Procedure - Re: Help-gsl Digest, Vol 192, Issue 9

[Simone Landini]

Good Morning everyone, and thank you Francesco for your indications.

This is the procedure I used, even if it worked for me I would 
appreciate your opinion and check:

1. Download VSC2019: you may be linked to a page to download your 
native-language version, for me it was the Italian language version.

2. Install VSC2019 and close.

3. Open VSC2019: if you have a non-English language version you may need 
to change the language of your version into English, this how I did it:

    [Tools>Get Tools and Features] then [Language Pack] and select 
[English] so modify and close.

    In my case this was important for the following step.

4. Then I followed these instructions (for Windows) 
https://solarianprogrammer.com/2020/01/26/getting-started-gsl-gnu-scientific-library-windows-macos-linux/

    to install a pre-compiled GSL with "vcpkg" for Windows: if you have 
an non-English language pack in VSC2019 at the end of the process 
"vcpkg" may give some warning and an error:

    so GSL may not be ready for use, at least this is what happened to me.

5. I created a simple project (named: ConsoleApplication14) copy&paste 
from https://www.gnu.org/software/gsl/doc/html/usage.html#an-example-program

6. CRTL+F5 and it worked, here is the log

1>------ Build started: Project: ConsoleApplication14, Configuration: 
Debug Win32 ------
1>ConsoleApplication14.cpp
1>ConsoleApplication14.vcxproj -> 
C:\Users\[user]\Documents\Z_VisualStudioProjects\ConsoleApplication14\Debug\ConsoleApplication14.exe
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

I didn't check if you may now switch back to your native-language 
VSC2019 version.

I hope this may help someone else.

Best wishes

Simone


Il 29/03/2020 18:00, address@hidden ha scritto:
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> Today's Topics:
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>     1. GSL installation procdure and linker related problems
>        (Simone Landini)
>     2. Re: GSL installation procdure and linker related problems
>        (Francesco Abbate)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Mar 2020 20:42:25 +0100
> From: Simone Landini <address@hidden>
> To: address@hidden
> Subject: GSL installation procdure and linker related problems
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hi evereyone, I try to be more precise wrt my previous help request.
>
> I am using Microsoft Visual Studio Community 2019 (VSC2019).
>
> I installed GSL using the vcpkg tool but I also copy&paste a gsl folder
> "C:\gsl" containing the latest gsl-2.6 files and folders: is this an
> appropriated procedure?
>
> Here is the code
>
> #include <stdio.h>
> // the path to the gsl folder is in "C:\gsl"
> #include <C:\gsl\specfunc\gsl_sf_bessel.h>
> // the example
> int main (void){
>     double x = 5.0;
>     double y = gsl_sf_bessel_J0 (x);
>     printf ("J0(%g) = %.18e\n", x, y);
>     return 0;
> }
>
> The VSC2019 editor does not highlight the "#include
> <C:\gsl\specfunc\gsl_sf_bessel.h>", so the library should be visible.
>
> Then CTRL+F5 and I have 3 errors: this is what I get (I have an Italian
> version of VSC2019: I translate below)
>
> Codice Descrizione Progetto
> File                                                     Riga
> E1696    impossibile aprire il codice errore "gsl/gsl_mode.h" del file
> origine    ConsoleApplication5 C:\gsl\specfunc\gsl_sf_bessel.h    26
>
> Code     Description Project
> File                                                     Row
> E1696    impossible to open "gsl/gsl_mode.h" of the origin file
>                  ConsoleApplication5 C:\gsl\specfunc\gsl_sf_bessel.h    26
>
> The same errors for "gsl/gsl_precison.h" and "gsl/gsl_sf_result.h"
>
> Are these linker related errors?
>
> How can I specify library name and path to the linker?
>
> Thank you
>
> Simone
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 28 Mar 2020 23:02:55 +0100
> From: Francesco Abbate <address@hidden>
> To: Simone Landini <address@hidden>
> Cc: address@hidden
> Subject: Re: GSL installation procdure and linker related problems
> Message-ID:
>         <CAABEgWoZwmFC+2gObdv-hQRkaWeSoJBV5zUsRu=address@hidden>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi Simone,
>
> the errors that you are getting are compile errors, not linking
> errors. What happens is that Visual Studio needs to locate the header
> files like "gsl/gsl_mode.h" but apparently it cannot found them.
>
> Normally you should make sure that you have actually installed these
> files and take note of where they are stored. These files are all
> provided by the GSL library. Once you are sure about where the header
> files are located you should go in the visual studio project and
> instruct application about the directory where to find them.
>
> You may follow the instructions here:
>
> https://stackoverflow.com/questions/4445418/how-to-add-additional-libraries-to-visual-studio-project
>
> I am reporting here the instructions:
>
> ------------ extract
> For Visual Studio you'll want to right click on your project in the
> solution explorer and then click on Properties.
>
> Next open Configuration Properties and then Linker.
>
> Now you want to add the folder you have the Allegro libraries in to
> Additional Library Directories,
>
> Linker -> Input you'll add the actual library files under Additional
> Dependencies.
>
> For the Header Files you'll also want to include their directories
> under C/C++ -> Additional Include Directories.
>
> If there is a dll have a copy of it in your main project folder, and done.
> ----------- end of the extract
>
> In your case it is the GSL library instead of "Allegro" but the same
> instructions applies. So you basically have to instruct the visual
> studio project (solution)
>
> - where the header files are located (gsl/gsl_mode.h etc, all the
> files terminating in .h). This is required for the compilation step.
> - where the library is located (.dll or .lib) so that it can be linked
> for the final step.
>
> For the GSL library you may have actually two libraries, libgsl.dll
> and libgslcblas.dll.
>
> Make sure that you have the libraries, where they are located and
> their names and add them into the project as explained above.
>
> Please note that if you downloaded the source code of the GSL library
> you will *not* have the libraries to link with. For this purpose you
> need to download the pre-compiled libraries for visual studio, for
> example using vcpkg.
>
> I hope this will be enough to get you started but I will be glad to
> assist you further!
>
> Kinds regards
> Francesco
>
>
>
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