[CMake] OS X and getline ?

[AJ ONeal]

Thank you Mike and Eric,

Mike,

This is the level of detail that I was hoping for in regards to CMake.

In order to get it to compile I had copy/pasted a getline substitute.
Now I'll go back and try to configure CMake correctly so that it works on
both OS X and Linux.


Eric,

The second link you gave is very helpful.

AJ ONeal

On Mon, Apr 25, 2011 at 7:49 AM, Michael Jackson <
mike.jackson at bluequartz.net> wrote:

> For the CMake side of things you can actually check for the function during
> the initial cmake checks:
>
> INCLUDE (${CMAKE_ROOT}/Modules/CheckFunctionExists.cmake)
> CHECK_FUNCTION_EXISTS(getline  HAS_GETLINE)
>
> This will perform the check and put the result into the variable
> "HAS_GETLINE". The easiest (but least maintainable way) is to then do:
>
> if (HAS_GETLINE)
>  ADD_DEFINITION(-DHAS_GETLINE)
> endif()
>
> Then in your source code you do:
>
> #ifdef HAS_GETLINE
>
> #else
>
> #endif
>
> When you get comfortable with that then what you _really_ do is to create a
> header template file for CMake to fill in. So create a file
> ProjectConfig.h.in and put this into it.
>
> #cmakedefine HAS_GETLINE @HAS_GETLINE@
>
> Then in your CMakeLists.txt file you would do this:
>
> configure_file ( ProjectConfig.h.in ${PROJECT_BINARY_DIR}/ProjectConfig.h
> @only immediate)
>
> Then in your source file simply include the generated header file:
>
> #include "ProjectConfig.h"
>
> All of this addresses how to detect the fact that OS X does not have
> getline. You are responsible for finding a substitution. Maybe this will
> help:
>
>
> http://doubletalkin.blogspot.com/2008/08/fgetln-replacement-for-getline-in-bsd.html
>
>
> ___________________________________________________________
> Mike Jackson                      www.bluequartz.net
> Principal Software Engineer       mike.jackson at bluequartz.net
> BlueQuartz Software               Dayton, Ohio
>
> On Apr 24, 2011, at 8:20 PM, AJ ONeal wrote:
>
> > What's the preferred solution to the OS X getline problem (meaning that
> it doesn't exist in OS X's libc) when using CMake?
> > ("Don't use getline" isn't an option)
> >
> >
> > I'd like to have an explanation of the solution and see an example which
> employs it.
> >
> >
> > This is my first time I've tried to compile my Linux code on OS X, so I
> don't know anything about how to specify the "do this with os xyz and do
> this with os abc" options.
> >
> > AJ ONeal
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