So I have been inspecting giac, as any discussion of making something
a standard package as an impact for sage-on-gentoo.
We have an old version in the science overlay so I am working on
upgrading it.
1) current 1.2.2-63 and a few earlier versions need the gui, compiling
with "--disable-gui" is broken.
2) the dependency on libao was making me curious so I investigated.
It is an "automagic" dependency. There is a line
AC_CHECK_LIB(ao, main)
in configure.in and the library can be used in src/maple.cc.
What this means is that if you build sage binary on a machine that
has libao, giac will be broken when the binary is installed on
machines without it. So this has to be fixed when giac becomes
standard.
3) lapack can be used but detection is strange and it could lead to
similar pitfalls than libao if the right files are present on the build
system. It currently cannot pick up sage's lapack. It is a default
configure option.
I haven't gone through giacpy yet, but I don't like the fact there
is a sage specific version. Something could be done to only have one
source if my understanding of the issues and solution are correct.
Francois
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