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On Jan 29, I started in this thread a sub-topic in reply to Albrecht's report on Jan 28 that FLTK building under macOS blocked with a certain but worked OK with another, earlier commit. "git bisect" allowed me to find what commit introduced this blocking. This commit (873d355) introduced a call to Fl::add_fd() at static initialization time in program fluid. It turned out this was the cause of the blocking:
- the building procedure builds and then runs program fluid to help build other programs;
- fluid erroneously calls Fl::add_fd() at static initialization time;
- specifically under macOS, Fl::add_fd() opens the display;
- for some reason which remains undetermined, an app run from /tmp may block
while attempting to open the display.
But, fluid should not open the display at static initialization time
because it must be usable in command line mode without access to a display.
Thus, Matthias removed from fluid, in a more recent commit (85ac3d3), the
call to Fl::add_fd() at static initialization time. In consequence, building
FLTK from /tmp no longer blocks. The sub-topic I opened is therefore to be
considered, I believe, closed and fixed.
Now, the main topic of this thread is, I believe, different.
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