Fix typos and try to improve some grammar in the files
in the top level directory.
* COMPILING: Improve grammar
* CONTRIBUTING: Improve grammar
* README: Improve grammar
* VISIBILITY: Improve grammar
Signed-off-by: Randy MacLeod <Randy.MacLeod@windriver.com>
Symbols of pretty much all member functions of types that are meant to
be "private" to translation units that contribute to libabigail.so
were exported because we didn't do much to prevent that.
This patch starts controlling the set of symbols that are exported.
By default, symbols of any entity declared in a translation unit that
contributes to libabigail.so are hidden by default. Only symbols of
entities declared in public headers (headers in include/*.h) are
exported.
There are many ways to achieve that. This patch chooses to avoid
cluttering declarations of entities in the public header by adding
__attribute__((visibility="default")) to every declared type of
function in there.
Rather, the patch uses "#pragma GCC visibility push(default)" before
entities declared on those headers. By doing so, all those entities
have their symbol marked as "visible" by the compiler. Once the
header are #included, the #pragma GCC visibility pop" is used, so that
anything else has its symbol be hidden from that point on.
Note that for ease of maintenance the patch uses the macros
ABG_BEGIN_EXPORT_DECLARATIONS and ABG_END_EXPORT_DECLARATIONS rather
than using the pragma directive directly.
I believe this is a more elegant way of handling visibility, compared
to cluttering every single declaration in public headers with a
"__attribute__((visibility=("default")))" or with a macro which
expands to it.
This reduces the the set of symbols exported by libabigail.so from
20000+ to less than 5000.
* VISIBILITY: New documentation about this visiblity business.
* CONTRIBUTING: Update the "contributing guide" to refer to symbol
visibility issues.
* configure.ac: Define a variable VISIBILITY_FLAGS that is set to
the -fvisibility=hidden flag to pass to GCC, when its available.
* src/Makefile.am: Add VISIBILITY to source distribution. Also
add COMPILING and COMMIT-LOG-GUIDELINES that were missing.
* src/Makefile.am: Use the new $(VISIBILITY_FLAGS) when buiding
the library.
* tests/Makefile.am: Use the new $(VISIBILITY_FLAGS) when buiding
tests.
* tools/Makefile.am: Use the new $(VISIBILITY_FLAGS) when buiding
tools.
* src/abg-comp-filter.cc: Enclose inclusion of public headers in
ABG_BEGIN_EXPORT_DECLARATIONS and ABG_END_EXPORT_DECLARATIONS to
export the symbols of entities declared in there.
* src/abg-comparison.cc: Likewise.
* src/abg-config.cc: Likewise.
* src/abg-corpus.cc: Likewise.
* src/abg-diff-utils.cc: Likewise.
* src/abg-dwarf-reader.cc: Likewise.
* src/abg-hash.cc: Likewise.
* src/abg-ini.cc: Likewise.
* src/abg-ir.cc: Likewise.
* src/abg-libxml-utils.cc: Likewise.
* src/abg-libzip-utils.cc: Likewise.
* src/abg-reader.cc: Likewise.
* src/abg-suppression.cc: Likewise.
* src/abg-tools-utils.cc: Likewise.
* src/abg-traverse.cc: Likewise.
* src/abg-viz-common.cc: Likewise.
* src/abg-viz-dot.cc: Likewise.
* src/abg-viz-svg.cc: Likewise.
* src/abg-workers.cc: Likewise.
* src/abg-writer.cc: Likewise.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
