Add WITH_MYSQL and WITH_POSTGRESQL CMake options

CMakeLists.txt

@@ -16,6 +16,7 @@ include(CheckCSourceCompiles)
 include(CheckCXXSourceCompiles)
 include(TestBigEndian)
 include(CheckFunctionExists)
+include(FindOptionalPackage)
 
 find_program(ECHO echo)
 find_program(XSLTPROC xsltproc)
@@ -402,6 +403,7 @@ message (STATUS "ENABLE_BUNDLED_LIBEV: ${ENABLE_BUNDLED_LIBEV}")
 message (STATUS "ENABLE_BUNDLED_LIBEIO: ${ENABLE_BUNDLED_LIBEIO}")
 message (STATUS "ENABLE_BUNDLED_LIBCORO: ${ENABLE_BUNDLED_LIBCORO}")
 message (STATUS "ENABLE_DOC: ${ENABLE_DOC}")
+list_optional_packages()
 message (STATUS "")
 message (STATUS "To view or modify configuration results, check out CMakeCache.txt.")
 message (STATUS "")

cmake/FindOptionalPackage.cmake

+if (NOT _OptionalPackagesFile)
+    set(_OptionalPackagesFile
+        ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/OptionalPackages.txt)
+    if (EXISTS ${_OptionalPackagesFile})
+        file(REMOVE ${_OptionalPackagesFile})
+    endif()
+endif()
+
+macro (find_optional_package _package)
+    string(TOUPPER ${_package} _packageUpper)
+    if (WITH_${_packageUpper})
+        # WITH_${_packageUpper} option requested by the user
+        set(${_packageUpper}_FIND_REQUIRED ON)
+    endif()
+    option(WITH_${_packageUpper} "Search for ${_package} package" ON)
+    if (WITH_${_packageUpper})
+        find_package(${_package} ${ARGN})
+    else (WITH_${_packageUpper})
+        set(${_package}_FOUND OFF)
+        set(${_packageUpper}_FOUND OFF)
+    endif ()
+    file(APPEND "${_OptionalPackagesFile}"
+         "-- WITH_${_packageUpper}=${WITH_${_packageUpper}}\n")
+endmacro (find_optional_package)
+
+macro(list_optional_packages)
+    file(READ ${_OptionalPackagesFile} _message)
+    message(STATUS "\n${_message}")
+endmacro()

src/plugin/mysql/CMakeLists.txt

-include(FindMySQL)
+find_optional_package(MySQL)
+
 if (MYSQL_FOUND)
 	message(STATUS "box.net.sql(mysql) INC=${MYSQL_INCLUDE_DIRS}")
 	message(STATUS "box.net.sql(mysql) LIBS=${MYSQL_LIBRARIES}")
@@ -7,6 +8,4 @@ if (MYSQL_FOUND)
 	add_library(mysql SHARED mysql.cc)
 	target_link_libraries(mysql ${MYSQL_LIBRARIES})
 	install(TARGETS mysql LIBRARY DESTINATION ${PLUGIN_DIR})
-else()
-	message(STATUS "MySQL client not found")
 endif()

src/plugin/pg/CMakeLists.txt

 # A special hack for buggy FindPostgreSQL.cmake in Debian/Ubuntu
 set(PostgreSQL_ROOT /usr/include/postgresql;/usr/include/postgres)
-find_package(PostgreSQL)
+find_optional_package(PostgreSQL)
 if (PostgreSQL_FOUND)
 	message(STATUS "box.net.sql(pg): INC=${PostgreSQL_INCLUDE_DIRS}")
 	message(STATUS "box.net.sql(pg): LIBS=${PostgreSQL_LIBRARIES}")