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Re: GDAL 2.3.0

On 04/21/2018 08:15 PM, Even Rouault wrote:
> On samedi 21 avril 2018 19:58:42 CEST Sebastiaan Couwenberg wrote:
>> On 04/21/2018 07:53 PM, Even Rouault wrote:
>>> On samedi 21 avril 2018 19:32:23 CEST Sebastiaan Couwenberg wrote:
>>>> Hi Even,
>>>> Regarding the C++11 requirement, this causes the liblas build to fail
>>>> due to the check in cpl_port.h.
>>>> liblas uses -std=c++98 whereas the gdal build used -std=gnu89
>>> You mean GDAL uses -std=c++11  right ?
>> No, the build used -std=gnu89, see the attached build log.
> Ah, std=gnu89 is used only to compiled .c files (to make sure we don't use a higher C dialect, 
> that wouldn't be supported by MSVC)
> But C++ files are compiled without any -std= since presumably the compiler you use on 
> debian unstable defaults to C++14
>>>> . Do you
>>>> recommend the latter for projects that depend on GDAL? Or should they
>>>> prefer -std=c++11?
>>> Projects using GDAL C++ API should use at least -std=c++11 (or higher)
>> See my previous message in this thread. Just changing -std=c++98 to
>> -std=c++11 did not fix the liblas build failure.
> Hum weird. I've just managed to build libLAS 1.8.1 against GDAL 2.3.0, with cmake, by forcing 
> CMAKE_CXX_FLAGS_RELEASE= -O3 -DNDEBUG -std=c++11, with the gcc 5.4 of my ubuntu 
> 16.04
> Actually I see in the log that -ansi is used, and according to gcc manpage, -ansi in C++ mode is 
> equivalent to -std=c++98. So perhaps -ansi -std=c++11 is equivalent to -ansi.

Removing -ansi doesn't trigger the error in cpl_port.h, but the build
still fail on Debian unstable:

/build/liblas-1.8.1/src/gt_citation.cpp: In function 'void
SetGeogCSCitation(GTIF*, OGRSpatialReference*, char*, int, short int)':
/build/liblas-1.8.1/src/gt_citation.cpp:390:58: error: call of
overloaded 'GetPrimeMeridian(NULL)' is ambiguous
         double primemValue = poSRS->GetPrimeMeridian(NULL);

This happens with or without the the additional -O3 and -DNDEBUG flags.

Kind Regards,


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