[Octave-bug-tracker] [bug #48105] function "glob" oddities with trailing "/"

[Mike Miller]

Follow-up Comment #3, bug #48105 (project octave):

At least on my system, the reason gnulib's own glob function is used is the
following:


configure:61153: checking whether glob lists broken symlinks
configure:61192: gcc -o conftest -g -O2 -pthread -fopenmp   conftest.c -lutil
-lm   >&5
configure:61192: $? = 0
configure:61192: ./conftest
configure:61192: $? = 1
configure: program exited with status 1
[…]
configure:61203: result: no


This defect means that gnulib's glob is enabled. Our logic in Octave also
unconditionally uses gnulib::glob, so we are currently assuming that it's
always enabled.

I didn't know what this test actually means until I looked into it. The gnulib
test creates a broken symlink to a non-existent file, then calls glob with a
pattern that matches the symlink. If glob returns GLOB_NOMATCH, then it is
considered to be broken and gnulib's replacement function is used. I don't
know the history of this or on which systems it actually works, if it's
something they're trying to get rolled into glibc, etc.

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