* configure.ac: Support a new --enable-zip-archive option. By
default its value is set to the 'auto', meaning that if libzip is
installed, that turns the option on -- just like if
--enable-zip-archive was called with the value 'yes'; if libzip is
not installed, that turns the option off -- just like if
--enable-zip-archive was called with the value 'no'. If libzip is
detected, the pre-processor macro HAVE_LIBZIP is set to 1. If
--enable-zip-archive is turned on, the pre-processor macro
WITH_ZIP_ARCHIVE is set to 1.
* config.h.in (HAVE_LIBZIP, WITH_ZIP): New define.
* src/abg-corpus.cc: Include config.h. Guard the inclusion of
abg-libzip-utils.h with the WITH_ZIP_ARCHIVE macro. Likewise for
the use of declarations coming from abg-libzip-utils.h.
* src/abg-libzip-utils.cc: Include config.h. Guard the file's
content with the WITH_ZIP_ARCHIVE macro.
* src/abg-reader.cc: Include config.h. Guard the inclusion of
abg-libzip-utils.h with the WITH_ZIP_ARCHIVE. Likewise for the
use of declarations coming from abg-libzip-utils.h.
* src/abg-writer.cc: Likewise.
* tests/Makefile.am: Build runtestwritereadarchive and runtestdot
only if zip archives are supported.
* tools/Makefile.am: The biar program is built only if
zip archives are supported.
* tools/bidiff.cc: Handle zip archives only if the
WITH_ZIP_ARCHIVE macros is defined.
* tools/bilint.cc: Likewise.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
