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

Tue Sep 24 16:08:53 EDT 2019

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
<https://cmake.org/cmake/help/latest/variable/PackageName_ROOT.html#packagename-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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