#14709: (Ab)using LIBRARY_PATH instead of using -L${SAGE_LOCAL}/lib doesn't
necessarily work
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Reporter: leif | Owner: GeorgSWeber
Type: defect | Status: new
Priority: critical | Milestone: sage-5.10
Component: build | Keywords: CPATH LIBRARY_PATH SAGE_LOCAL -I
-L sage-env search directories paths
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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In `sage-env`, we meanwhile add (more precisely, '''ap'''pend)
`${SAGE_LOCAL}/include` to `CPATH`, and `${SAGE_LOCAL}/lib` to
`LIBRARY_PATH`.
Besides that this is non-portable, or rather a GCC feature, it is
'''not''' equivalent to adding / prepending `-I${SAGE_LOCAL}/include` to
`CPPFLAGS`/`CFLAGS`/`CXXFLAGS` and `-L${SAGE_LOCAL}/lib` to `LDFLAGS`.
First of all, search paths / folders specified ''on the command line''
'''precede''' all others, and second, those specified through `CPATH`,
`LIBRARY_PATH` etc. are not necessarily searched before system folders.
This currently leads to problems with e.g. readline and R (which doesn't
support configuring with `--with-readline=<prefix>`, but just `=yes` or
`=no`), where adding Sage's directories was dropped from `spkg-install`.
To test this, try for example
{{{
#!sh
$ mkdir -pv /tmp/LOOK_HERE
$ env LIBRARY_PATH=/tmp/LOOK_HERE $CC -print-search-dirs | egrep
'^libraries|LOOK_HERE'
# (and/or)
$ env LIBRARY_PATH=/tmp/LOOK_HERE $CC -v -x c /dev/null -o /dev/null 2>&1
| egrep '^LIBRARY_PATH|LOOK_HERE'
}}}
where `$CC` is the compiler / GCC of your choice (e.g. just `gcc`).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14709>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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