[GRASS-dev] [bug #5028] (grass) simwe needs indirectly linked vector libs

[Glynn Clements]

Request Tracker wrote:

> this bug's URL: http://intevation.de/rt/webrt?serial_num=5028
> -------------------------------------------------------------------------
> 
> Subject: simwe needs indirectly linked vector libs
> 
> Platform: Mac OSX
> grass obtained from: Trento Italy site
> grass binary for platform: Compiled from Sources
> GRASS Version: 6.1+
> 
> Some of the libraries needed by the simwe/simlib themselves use the vector libraries, but the vector 
> libraries are not directly linked into simlib.  This causes a build failure in many cases because the 
> linker can't find those indirectly linked libraries (at least with the Mac OS X linker).
> 
> When it's a first-time build or a version upgrade, there is no GRASS installed.  Or in a SDK build (ie 
> on Mac OS X), the SDK overrides the usual system paths, and GRASS does not exist in the SDK.  
> Another possible problem is if the vector libs get new functions, a previously installed GRASS' vector 
> libs will be used and not have those functions.
> 
> A quick fix is to install GRASS after simwe build failed, so at least the libraries are available, then 
> rebuild simwe.  But this is not good - it doesn't work for the SDK case, and it's possible the build will 
> go directly into a distribution install, and not a normal install at all.
> 
> To fix, edit simwe/simlib/makefile: add $(VECTLIB) to EXTRA_LIBS, and add $(VECTDEP) to 
> DEPENDENCIES.  At least that's what I do for now.

Ideally, this should be fixed by adding any required libraries to the
library variable in Grass.make.in.

The individual Makefiles should only need to specify libraries which
the module uses directly (i.e. where the module's source code contains
a call to a function in that library). The build system should take
care of the rest.

For shared GRASS libraries, the dependencies shouldn't be necessary. 
If the linker only finds them when there is an existing installation,
that implies that the link flags need something similar to the
-Wl,-rpath-link,${LIB_RUNTIME_DIR} switch which is used on Linux.

Static libraries don't have dependency information, so it needs to be
specified explicitly in Grass.make.

-- 
Glynn Clements <glynn at gclements.plus.com>