gap-system
why is gap-install linked with libgap?
In Makefile.rules one has
# build rule for the gap executable used by the `install-bin` target
build/gap-install: libgap$(SHLIB_EXT) cnf/GAP-LDFLAGS cnf/GAP-LIBS cnf/GAP-OBJS build/obj/build/main.c.o
$(QUIET_LINK)$(LINK) $(GAP_LDFLAGS) build/obj/build/main.c.o $(GAP_LIBS) -L${abs_builddir} -lgap -o $@
endif
Does this mean that gap as installed by make install is using libgap, unlike ./gap produced by make ?
And so, in particular, packages producing GAP kernel extensions might need to be linked to libgap (we observe errors on a recent arm64 macOS to this extent).
@culler
Does this mean that gap as installed by make install is using libgap, unlike ./gap produced by make ?
Yes exactly.
And so, in particular, packages producing GAP kernel extensions might need to be linked to libgap
Yup. As a general rule, you need to link a kernel extension against the kernel it is supposed to be used with, and using the sysinfo.gap resp. gac that was built / installed with that kernel, as only that is guaranteed (well, up to mistakes on our part of course) to have the correct compiler and linker flags.
I am not sure I understand what "link a kernel extension against the kernel" means. As I try the current master branch on arm64 macOS, with cd bar && ./configure --prefix=foo && make && make install, I then configure/build, say, crypting package with
./configure foo/lib/gap # sysroot.gap is there
make && make install
Then I fake installing the packages by
ln -s bar/pkg foo/share/gap/
and foo/bin/gap runs and successfully loads crypting (and runs its tests).
However, crypting.so isn't linked to anything except a system library, i.e.
% otool -L bin/aarch64-apple-darwin24-default64-kv10/crypting.so
bin/aarch64-apple-darwin24-default64-kv10/crypting.so:
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1351.0.0)
%
I see nothing actionable here, in particular no concrete error or issue that we could potentially reproduce and address.
If you have a concrete issue & reproducer please file a new issue.
(see also https://github.com/gap-system/gap/pull/5780 which might or might not be relevant to you)