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A simple HelloWorld program with zero includes except iostream triggers a build of ca. 2000 source files. The reason is that ClickHouse's top-level CMakeLists.txt overrides "add_executable()" to link all binaries against "clickhouse_new_delete". This links against "clickhouse_common_io", which in turn has lots of 3rd party library dependencies ... Without linking "clickhouse_new_delete", the number of compiled files for "HelloWorld" goes down to ca. 70. As an example, the self-extracting-executable needs none of its current dependencies but other programs may also benefit. In order to restore access to the original "add_executable()", the overriding version is now prefixed. There is precedence for a "clickhouse_" prefix (as opposed to "ch_"), for example "clickhouse_split_debug_symbols". In general prefixing makes sense also because overriding CMake commands relies on undocumented behavior and is considered not-so-great practice (*). (*) https://crascit.com/2018/09/14/do-not-redefine-cmake-commands/ |
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| .. | ||
| tests | ||
| CMakeLists.txt | ||
| ColumnInfoHandler.cpp | ||
| ColumnInfoHandler.h | ||
| getIdentifierQuote.cpp | ||
| getIdentifierQuote.h | ||
| HandlerFactory.cpp | ||
| HandlerFactory.h | ||
| IdentifierQuoteHandler.cpp | ||
| IdentifierQuoteHandler.h | ||
| MainHandler.cpp | ||
| MainHandler.h | ||
| odbc-bridge.cpp | ||
| ODBCBlockInputStream.cpp | ||
| ODBCBlockInputStream.h | ||
| ODBCBlockOutputStream.cpp | ||
| ODBCBlockOutputStream.h | ||
| ODBCBridge.cpp | ||
| ODBCBridge.h | ||
| ODBCPooledConnectionFactory.h | ||
| PingHandler.cpp | ||
| PingHandler.h | ||
| SchemaAllowedHandler.cpp | ||
| SchemaAllowedHandler.h | ||
| validateODBCConnectionString.cpp | ||
| validateODBCConnectionString.h | ||