[geos-devel] cmake detailed comments

[Paul Ramsey]

Actually searching for "RPATH" here turns up all kinds of knobs if you want different things done to rpath

https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html

P.

> On Oct 13, 2021, at 3:18 PM, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
> 
> Consider looking at cmake descriptions of what it intends to do with RPATH, and ways to set link flags without forcing environment variables in
> 
> https://cmake.org/cmake/help/latest/variable/CMAKE_SHARED_LINKER_FLAGS.html
> https://cmake.org/cmake/help/latest/variable/CMAKE_SKIP_INSTALL_RPATH.html
> https://cmake.org/cmake/help/latest/variable/CMAKE_SKIP_RPATH.html
> 
> P
> 
> 
>> On Oct 13, 2021, at 3:17 PM, Sandro Santilli <strk at kbt.io> wrote:
>> 
>> I should add, I'm using cmake version 3.16.3
>> 
>> --strk;
>> 
>> On Wed, Oct 13, 2021 at 11:31:54PM +0200, Sandro Santilli wrote:
>>> On Wed, Oct 13, 2021 at 12:08:50PM -0400, Greg Troxel wrote:
>>> 
>>>> So maybe strk can test (on Linux I'm guessing):
>>> 
>>> Ubuntu 20.10 here
>>> 
>>>> build and install geos 3.9.1 as --prefix=/usr/foo
>>> 
>>> Done (3.9 branch of geos):
>>> 
>>> ./autogen.sh && \
>>> ./configure --prefix=/tmp/geos && \
>>> sudo make install
>>> 
>>> 
>>> Note that after this I get:
>>> 
>>> $ objdump -x /tmp/geos/lib/libgeos_c.so.1.14.2  | grep RUNPATH
>>>  RUNPATH              /tmp/geos/lib
>>> 
>>> I'm not sure it's relevant.
>>> 
>>>> build geos 3.10 by telling cmake to use /usr/foo as prefix, and
>>>> passing in the environment
>>>>  CPPFLAGS=-I/usr/foo/include
>>>>  LDFLAGS="-L/usr/foo/lib -Wl,-R/usr/foo/lib"
>>>> as a packaging system building everything for /usr/foo would do.
>>> 
>>> Done:
>>> 
>>> $ export CPPFLAGS=-I/tmp/geos
>>> $ export LDFLAGS="-L/tmp/geos/lib -Wl,-R/tmp/geos/lib"
>>> $ cmake .
>>> $ make 
>>> 
>>>> Then look at the test binaries  with objdump -x, ldd, and run them.I
>>>> expect they will mislink against the installed geos.
>>> 
>>> $ objdump -x bin/test_geos_unit | grep RUNPATH
>>>  RUNPATH /tmp/geos/lib:/usr/local/src/geos/geos/src/main/lib
>>> $ ldd bin/test_geos_unit | grep tmp
>>>      libgeos_c.so.1 => /tmp/geos/lib/libgeos_c.so.1 (0x00007f0be9ead000)
>>>      libgeos-3.9.2.so => /tmp/geos/lib/libgeos-3.9.2.so (0x00007f0be9489000)
>>> 
>>>> If so, the bug in cmake or geos cmakefiles is that the extra RPATH for
>>>> tests is put after the other RPATH values, rather then being put first.
>>>> 
>>>> Or rather, that is the bug, but if you can reproduce it that's progress
>>>> in understanding its scope.
>>> 
>>> So yes, I can reproduce the problem on a Linux system.
>>> 
>>> --strk;
>> 
>> -- 
>> 
>> Libre GIS consultant/developer
>> https://strk.kbt.io/services.html
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>