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Use versioned symbols to keep libgfapi at libgfapi.so.0.0.0
Revisited to address broken build on Mac OS X
See http://review.gluster.org/9036
Rebased to include http://review.gluster.org/#/c/9376/ (glfs_resolve())
but note that gerrit's "Rebase Change" couldn't do it.
N.B. noticed that glfs_get_volumeid() decl in glfs.h was missing
the __THROW, added it.
On systems using ELF and the GNU toolchain, symbol versions are created
with a .symver asm operand in the .c source file. Clang is claimed to
be compatible with gcc, so we'll pretend for now that this also works
with clang.
On Mac OS X, aliases are created with __asm "magic" in the .h header
file. In the normal case, when both the decl and defn match, that's
all that's needed. In our case though the decl and defn don't match ---
we have, e.g. a defn such as 'int glfs_foo(...)' and the corresponding
decl is 'int pub_glfs_foo(...)'. To make this work we create the necessary
aliases in the library at link time with the -alias_list link option.
Note that this results in there being pairs of symbols in the .dylib,
e.g. _pub_glfs_foo and _glfs_foo$GFAPI_3.4.0. We could use another
link option, -unexported_symbols_list to elide the _pub_glfs_* symbols.
(And we probably should.)
Linux symbol versioning was essentially copied from Solaris; in general
I would expect this to "just work" on Solaris, but until someone tries
we don't really know.
Change-Id: Icb96a3c2d80be7b6d7a6849bb9168f03a947f47c
BUG: 1160709
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/9143
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
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glfs_resolve() is an internal function in libgfapi. Export it so that it can be
used by glfs-heal.c. The change is done in line with the approach followed in
commit 7e497871d11a3a527e2ce192e4274322631f27d0 (http://review.gluster.org/9036)
This patch [2/3] is required as a part of afr automated split-brain resolution
implementation.
Change-Id: If9057f2a037fd25a0dfa231683bfbaa72d3cb1b2
BUG: 1136769
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: http://review.gluster.org/9376
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
Tested-by: Shyamsundar Ranganathan <srangana@redhat.com>
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Use versioned symbols to keep libgfapi at libgfapi.so.0.0.0
Some nits uncovered:
+ there are a couple functions declared that do not have an
associated definition, e.g. glfs_truncate(), glfs_caller_specific_init()
+ there are seven private/internal functions used by heal/src/glfsheal
and the gfapi master xlator (glfs-master.c): glfs_loc_touchup(),
glfs_active_subvol(), and glfs_subvol_done(), glfs_init_done(),
glfs_resolve_at(), glfs_free_from_ctx(), and glfs_new_from_ctx();
which are not declared in glfs.h;
+ for this initial pass at versioned symbols, we use the earliest version
of all public symbols, i.e. those for which there are declarations in
glfs.h or glfs-handles.h.
Further investigation as we do backports to 3.6, 3.4, and 3.4
will be required to determine if older implementations need to
be preserved (forward ported) and their associated alias(es) and
symbol version(s) defined.
FWIW, we should consider linking all of our libraries with a map, it'll
result in a cleaner ABI. Perhaps something for an intern to do or a
Google Summer of Code project.
Change-Id: I499456807a5cd26acb39843216ece4276f8e9b84
BUG: 1160709
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/9036
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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