[CMake] Fwd: Linking GSL to cmake using command line

Tue Sep 24 22:15:27 EDT 2019

 I did install it in a non standard path. Which is why was trying to figure out how to link gsl. I couldn’t use homebrew since I don’t have root permissions on the machine. Do you just edit the text file just before calling find_package statement like this ?
GSL_ROOT_DIR=\path\to\gsl

Thanks!
Best regards,
Sachi

> On Sep 24, 2019, at 3:08 PM, Avraham Shukron <avraham.shukron at gmail.com> wrote:
> 
> The macro looks fine (assuming you actually call it somewhere).
> And I also assume that the line that fails is the find_package(GSL REQUIRED)
> 
> I suspect that it fails because you installed GSL in a local directory that is not in a location known to cmake (E.g not in /usr/local/lib or something similar)
> 
> Can you specify the path you installed GSL to?
> 
> In order for CMake to find package in a non-standard location, you can set the GSL_ROOT cmake variable before calling find_package(GSL).
> You should set it to wherever you installed the GSL library locally.
> 
>> On Tue, Sep 24, 2019 at 9:37 PM Sachithra Weerasooriya <sachiwee at gmail.com> wrote:
>> Hi Avraham!
>> I installed GSL manually using in a local directory. OS version is macOS Mojave 10.14.5. Here's part of the file that looks for gsl:
>> #
>> # How we find GSL and set it up
>> #
>> macro(find_gsl)
>> 	find_package(GSL REQUIRED)
>> 	list(APPEND VR_INCLUDE_DIRS ${GSL_INCLUDE_DIRS})
>> 	list(APPEND VR_LIBS ${GSL_LIBRARIES})
>> endmacro()
>> 
>> #
>> 
>> Thank you!
>> Best Regards,
>> Sachi
>> 
>>> On Tue, Sep 24, 2019 at 1:08 PM Avraham Shukron <avraham.shukron at gmail.com> wrote:
>>> Hi Sachi!
>>> 
>>> Could you paste a minimal CMakeLists.txt file that demonstrate the problem, along with details about your OS version and how did you install GSL?
>>> 
>>> Thanks!
>>> 
>>>> On Tue, Sep 24, 2019 at 7:55 PM Raymond Wan <rwan.work at gmail.com> wrote:
>>>> Hi Sachi and everyone,
>>>> 
>>>> Sorry, I didn't realise her original message wasn't CC'ed to the list.
>>>> Please keep replies to the list, Sachi, unless there's a good reason
>>>> you shouldn't.  It will also allow someone to jump in if I've said
>>>> something incorrectly about your problem.
>>>> 
>>>> Ray
>>>> 
>>>> 
>>>> ---------- Forwarded message ---------
>>>> From: Raymond Wan <rwan.work at gmail.com>
>>>> Date: Wed, Sep 25, 2019 at 12:52 AM
>>>> Subject: Re: [CMake] Linking GSL to cmake using command line
>>>> To: Sachithra Weerasooriya <sachiwee at gmail.com>
>>>> 
>>>> 
>>>> Hi Sachi,
>>>> 
>>>> Then, to be frank, it's not something that CMake's users can help you
>>>> with.  It's (most probably) how the developer is using CMake to look
>>>> for GSL and you should be contacting him/her.  Generally, the end user
>>>> of program X shouldn't have to learn about CMake.  (Of course, no one
>>>> is stopping you from learning.)  The developer should be trying to fix
>>>> it, unless you happen to already be an expert on CMake.
>>>> 
>>>> If the developer isn't very responsive to your query, then that's a
>>>> separate issue, that's also not related to CMake...  S/he might be
>>>> happy to hear from you since it's a bug report and it can only make
>>>> program X better...I think?
>>>> 
>>>> Ray
>>>> 
>>>> On Wed, Sep 25, 2019 at 12:38 AM Sachithra Weerasooriya
>>>> <sachiwee at gmail.com> wrote:
>>>> >
>>>> > Hi Ray!
>>>> > Thank you  for your prompt reply! I appreciate it. Actually I am trying to install a package that uses cmake. Although GSL is installed in my machine, cmake can’t find the GSL directory.
>>>> >
>>>> > Best regards,
>>>> > Sachi
>>>> >
>>>> >
>>>> >
>>>> > Sent from my iPhone
>>>> >
>>>> > > On Sep 24, 2019, at 11:28 AM, Raymond Wan <rwan.work at gmail.com> wrote:
>>>> > >
>>>> > > Hi Sachi,
>>>> > >
>>>> > > Unfortunately, the short answer is "no".  I think you misunderstand
>>>> > > what CMake is.  One way to summarise it is that it allows developers
>>>> > > of programs to describe/explain how to compile and link software.  For
>>>> > > example, suppose there is a program X and it uses the GSL library.  A
>>>> > > programmer might use CMake to explain how GSL can link with X on Mac,
>>>> > > Linux, etc. -- across various platforms.  This will make it easier for
>>>> > > the end user.
>>>> > >
>>>> > > If you are an end user (i.e., you didn't make the program X), then you
>>>> > > need CMake isn't for you.  I'm afraid you might have to read the GSL
>>>> > > documentation for Mac, instead.  If you are the developer of X, then
>>>> > > you might want to go through the various CMake tutorials and give it a
>>>> > > try -- then, if you're still stuck, post what you got so far so that
>>>> > > someone can help you.
>>>> > >
>>>> > > Based on what you've asked, my guess is that CMake isn't what you
>>>> > > should be looking into.
>>>> > >
>>>> > > Ray
>>>> > >
>>>> > > On Wed, Sep 25, 2019 at 12:22 AM Sachithra Weerasooriya
>>>> > > <sachiwee at gmail.com> wrote:
>>>> > >>
>>>> > >> Hi CMake community!
>>>> > >> I am having trouble linking GSL to cmake using command line. I am using a Mac. Can someone please help me?
>>>> > >>
>>>> > >> Thank you!
>>>> > >> Best regards,
>>>> > >> Sachi
>>>> > >>
>>>> > >>
>>>> > >> --
>>>> > >>
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>>>> 
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>>>> 
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