[CMake] Reason for deprecation of GenerateExportHeader ?

[Jean-Michaël Celerier]

Hello,

the documentation page
https://cmake.org/cmake/help/v3.11/module/GenerateExportHeader.html has the
mention :

> This function is deprecated. Set the target properties
CXX_VISIBILITY_PRESET and VISIBILITY_INLINES_HIDDEN instead.

Why is that so ? I don't know any library that would export either all or
none of its symbols ; functions & types of the public API must always be
chosen manually by the author of the library anyways. The only use of
CXX_VISIBILITY_PRESET is to set the visibility to hidden by default, so
that code can then use the export macros defined by the generate_export _
header code to make specific symbols visible.

Best,
Jean-Michaël

-------
Jean-Michaël Celerier
http://www.jcelerier.name
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