[gdal-dev] [EXTERNAL] [BULK] Re: Is there a way to load a custom driver without a declaration in gdal_frmts.h?

[Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC]]

Excellent, thanks.

From: Even Rouault <even.rouault at spatialys.com>
Date: Monday, December 11, 2023 at 11:24 AM
To: "Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC]" <jesse.r.meyer at nasa.gov>, Laurențiu Nicola <lnicola at dend.ro>, "gdal-dev at lists.osgeo.org" <gdal-dev at lists.osgeo.org>
Subject: Re: [gdal-dev] [EXTERNAL] [BULK] Re: Is there a way to load a custom driver without a declaration in gdal_frmts.h?

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Le 11/12/2023 à 17:17, Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] via gdal-dev a écrit :
Thanks, that looks promising.

Does GDAL automatically call `AutoLoadDrivers`?  If not, do team members need to force a call to that?

GDALAllRegister() which is normally called by all standard code using GDAL calls it: https://github.com/OSGeo/gdal/blob/54890592b410d95a59b4b07c0b499ca383005514/frmts/gdalallregister.cpp#L319

Even

From: gdal-dev <gdal-dev-bounces at lists.osgeo.org><mailto:gdal-dev-bounces at lists.osgeo.org> on behalf of Laurențiu Nicola via gdal-dev <gdal-dev at lists.osgeo.org><mailto:gdal-dev at lists.osgeo.org>
Reply-To: Laurențiu Nicola <lnicola at dend.ro><mailto:lnicola at dend.ro>
Date: Monday, December 11, 2023 at 11:13 AM
To: "gdal-dev at lists.osgeo.org"<mailto:gdal-dev at lists.osgeo.org> <gdal-dev at lists.osgeo.org><mailto:gdal-dev at lists.osgeo.org>
Subject: [EXTERNAL] [BULK] Re: [gdal-dev] Is there a way to load a custom driver without a declaration in gdal_frmts.h?

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Hi Jesse,

https://gdal.org/api/gdaldriver_cpp.html#_CPPv4N17GDALDriverManager15AutoLoadDriversEv should answer your question.

Laurentiu

On Mon, Dec 11, 2023, at 18:11, Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] via gdal-dev wrote:

Hi,



I know drivers can be built as plugins, but can they be detected / used by GDAL if they are not registered via gdal_frmts.h?  It doesn’t seem so.  Is this a C++ ABI restriction?  We’d like to provide members of our team an internal and custom gdal driver implementation without each of them needing a special GDAL build.



Best,

Jesse
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