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Update README.CMake.txt for building X11 specific programs 

Clarify different ways to disable Wayland in executable programs
designed to use X11 specific code w/o further changes.
This commit is contained in:
Albrecht Schlosser 2024-05-11 17:29:26 +02:00
parent e5afb8a532
commit e9feef99fa
1 changed files with 11 additions and 6 deletions
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17
README.Wayland.txt
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@ -70,25 +70,30 @@ FLTK source code and also X11-specific source code conceived for FLTK 1.3
should run with a Wayland-enabled FLTK 1.4 library with this single change.
Caveat: when building a user project with the requirement to use CMake
version 3.4 or higher, i.e. using
Note 1: this may require some linker flags to enable exporting symbols
from *executable* programs which FLTK uses to "read" the global symbol
'fl_disable_wayland'. For for GNU `ld` or any GNU compiler this would
be "-rdynamic".
Note 2: When building a user project with CMake 3.4 or higher, i.e. using
cmake_minimum_required (VERSION 3.4)
or any higher (minimum) CMake version users need to use at least one of
the following options:
the following techniques:
Option 1: Set target property 'ENABLE_EXPORTS' on all executable
targets that require it to disable the Wayland backend.
targets that require to disable the Wayland backend.
This is the preferred solution.
CMake example:
set_target_properties(prog PROPERTIES ENABLE_EXPORTS TRUE)
set_target_properties(myprog PROPERTIES ENABLE_EXPORTS TRUE)
Option 2: Set CMake policy CMP0065 to 'OLD' (to pre-3.4 behavior)
This is a quick solution but discouraged because setting
CMake policies to 'OLD' is deprecated by definition.
CMake policies to 'OLD' is "deprecated by definition".
CMake code: