MDEV-293 5.5 RPMs for RHEL6/CentOS6

Build MariaDB-compat rpm by repackaging files from MariaDB-shared-5.3.*.rpm
Or RHEL6/CentOS6 make all other MariaDB rpms depend on MariaDB-compat.

cmake/cpack_rpm.cmake

@@ -21,6 +21,7 @@ SET(CPACK_COMPONENT_MANPAGESCLIENT_GROUP "client")
 SET(CPACK_COMPONENT_README_GROUP "server")
 SET(CPACK_COMPONENT_SHAREDLIBRARIES_GROUP "shared")
 SET(CPACK_COMPONENT_COMMON_GROUP "common")
+SET(CPACK_COMPONENT_COMPAT_GROUP "compat")
 SET(CPACK_COMPONENTS_ALL Server ManPagesServer IniFiles Server_Scripts
                                 SupportFiles Development ManPagesDevelopment
                                 ManPagesTest Readme ManPagesClient Test 
@@ -94,5 +95,35 @@ SET(CPACK_RPM_test_PACKAGE_PROVIDES "MariaDB-test MySQL-test mysql-test")
 # workaround for lots of perl dependencies added by rpmbuild
 SET(CPACK_RPM_test_PACKAGE_PROVIDES "${CPACK_RPM_test_PACKAGE_PROVIDES} perl(lib::mtr_gcov.pl) perl(lib::mtr_gprof.pl) perl(lib::mtr_io.pl) perl(lib::mtr_misc.pl) perl(lib::mtr_process.pl) perl(lib::v1/mtr_cases.pl) perl(lib::v1/mtr_gcov.pl) perl(lib::v1/mtr_gprof.pl) perl(lib::v1/mtr_im.pl) perl(lib::v1/mtr_io.pl) perl(lib::v1/mtr_match.pl) perl(lib::v1/mtr_misc.pl) perl(lib::v1/mtr_process.pl) perl(lib::v1/mtr_report.pl) perl(lib::v1/mtr_stress.pl) perl(lib::v1/mtr_timer.pl) perl(lib::v1/mtr_unique.pl) perl(mtr_misc.pl)")
 
+# If we want to build build MariaDB-shared-compat,
+# extract compat libraries from MariaDB-shared-5.3 rpm
+FILE(GLOB compat_rpm RELATIVE ${CMAKE_SOURCE_DIR}
+    "${CMAKE_SOURCE_DIR}/../MariaDB-shared-5.3.*.rpm")
+IF (compat_rpm)
+  MESSAGE("Using ${compat_rpm} to build MariaDB-compat")
+  INSTALL(CODE "EXECUTE_PROCESS(
+                 COMMAND rpm2cpio ${CMAKE_SOURCE_DIR}/${compat_rpm}
+                 COMMAND cpio --extract --make-directories */libmysqlclient*.so.* -
+                 WORKING_DIRECTORY \$ENV{DESTDIR})
+                EXECUTE_PROCESS(
+                 COMMAND chmod -R a+rX .
+                 WORKING_DIRECTORY \$ENV{DESTDIR})"
+                 COMPONENT Compat)
+  SET(CPACK_COMPONENTS_ALL ${CPACK_COMPONENTS_ALL} Compat)
+
+  # RHEL6/CentOS6 install Postfix by default, and it requires
+  # libmysqlclient.so.16 that pulls in mysql-libs-5.1.x
+  # And the latter conflicts with our rpms.
+  # Make sure that for these distribuions all our rpms require
+  # MariaDB-compat, that will replace mysql-libs-5.1
+  IF(RPM MATCHES "(rhel|centos)6")
+    SET(CPACK_RPM_common_PACKAGE_REQUIRES "MariaDB-compat")
+  ENDIF()
+ENDIF(compat_rpm)
+
+SET(CPACK_RPM_compat_PACKAGE_REQUIRES "/bin/sh") # to mask CPACK_RPM_PACKAGE_REQUIRES
+SET(CPACK_RPM_compat_PACKAGE_PROVIDES "mysql-libs = 5.3.5") # exact version doesn't matter as long as it greater than 5.1
+SET(CPACK_RPM_compat_PACKAGE_OBSOLETES "mysql-libs < 5.3.5")
+
 ENDIF(RPM)