Bug#36807184 The Debian and Ubuntu package "libmysqlcppconnx2" might fail to install

Fixed by determining library location at package build time so that
there is no need to call dpkg-architecture in the postinst script.

Author: rsomla1

packaging/deb-in/CMakeLists.txt

@@ -85,6 +85,23 @@ IF(DEB_CODENAME STREQUAL "sid")
   SET (DEB_PLATFORMRELEASE "debianunstable")
 ENDIF()
 
+# Determine multiarch library install location
+
+execute_process(
+  COMMAND dpkg-architecture -q DEB_TARGET_MULTIARCH
+  OUTPUT_VARIABLE DEB_TARGET_MULTIARCH
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+  RESULT_VARIABLE res
+)
+
+if(res)
+  message(FATAL_ERROR "Failed to execute dpkg-architecture")
+endif()
+
+set(LIB_DIR "/usr/lib/${DEB_TARGET_MULTIARCH}")
+message(STATUS "multiarch lib location: ${LIB_DIR}")
+
+
 #Follow MYSQLCLIENT_STATIC_LINKING option on packaging
 if(DEFINED MYSQLCLIENT_STATIC_LINKING)
   set(DEB_CMAKE_EXTRAS

packaging/deb-in/rules.in

@@ -30,7 +30,7 @@ export DH_VERBOSE=1
 export CFLAGS=
 export CXXFLAGS=
 
-export LIB_DIR = /usr/lib/$(DEB_HOST_MULTIARCH)
+export LIB_DIR = @LIB_DIR@
 export PLUGIN_DIR = $(LIB_DIR)/mysql/libmysqlcppconn@JDBC_ABI_VERSION_MAJOR@/plugin
 
 export CMAKE_OPTS= \

packaging/deb-in/xdevapi.postinst.in

@@ -1,9 +1,7 @@
 #! /bin/sh
 set -e
 
-LIBDIR=/usr/lib/`dpkg-architecture -q DEB_TARGET_MULTIARCH`
-
-cd ${LIBDIR}
+cd @LIB_DIR@
 
 # Do nothing if old name is already present
 test -e libmysqlcppconn8.so.2 && return 0