#13341: GAP's spkg-install fails on recent Cygwin
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Reporter: jpflori | Owner: tbd
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.3
Component: cygwin | Resolution:
Keywords: cygwin gap spkg | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Jean-Pierre Flori | Merged in:
Dependencies: | Stopgaps:
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Comment (by leif):
Rather than expressing hope, how about testing for the presence of `gap`?
;-)
You could also just use `ln -sf ...` ("force"), which doesn't fail if the
source (second parameter) already exists, i.e., with `-f` a new link is
created regardless. No idea how that behaves on Cygwin with "virtual"
files; it may create a cycle (symbolic link from 'gap.exe' to itself), or
fail in other ways, then hopefully raising an error...
(Note that `ln -s <non-existent-1> <non-existent-2>` does '''not''' fail,
but instead creates a "dead" symbolic link [although not sure about that
on Cygwin, since we use `touch` to create a dummy target]. So you may
also have to check whether the target, `gap.exe`, really exists, i.e., the
"build" so far succeeded, here meaning `mkdir`, `cd` and `touch` worked...
:-) )
If you don't want to use the "force" option, you could instead do
{{{
#!sh
mkdir -p bin/i686-pc-cygwin-gcc &&
cd bin/i686-pc-cygwin-gcc &&
touch gap.exe &&
(test -f gap || ln -s gap.exe gap) # Probably don't use '-x'
# since 'gap.exe' is yet a
dummy.
if [[ $? -ne 0 ]]; then
# *Something* really went wrong...
...
exit 1
}}}
But perhaps it's better to at least slightly untangle the command chain:
{{{
#!sh
mkdir -p bin/i686-pc-cygwin-gcc &&
cd bin/i686-pc-cygwin-gcc &&
touch gap.exe
if [[ $? -ne 0 ]]; then
# Some serious error...
...
exit 1
fi
# We may need a link from 'gap' to 'gap.exe', since the former
later gets
# stripped by GAP.
# On newer Cygwins, 'gap' is automatically "translated" to
'gap.exe',
# such that 'ln' (without '-f') would fail (and we don't have to
create the
# link on these systems anyway, since 'strip gap' there works
without it).
if [[ ! -f gap ]]; then
ln -s gap.exe gap
# May check exit status here, since the above should never
fail.
fi
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13341#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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