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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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Note If are using Linux and the configure file does not exist, you need to generate the file using one of the
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platform scripts in the BUILD directory. For example, to create the configure file for a Pentium-class machine using debug, run the command ./BUILD/compile-pentium-debug from the root of the source tree. Once the file is created, you can run the ./configure, make, and make install commands to build the server.
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The configure script will check the system for dependencies and create the appropriate makefiles. The make and make install commands build the system for the first time and build the installation. Most developers run these commands when building the MySQL source code. If compiling for the first time, you may need to change the owner of the files (if you aren t using root) and make group adjustments (for more details see Source Installation Overview in the MySQL Reference Manual at http://dev.mysql.com/doc/refman/5.1/en/quick-install.html). The following outlines a typical build process for building the source code on Linux for the first time: %> %> %> %> %> %> %> %> %> %> %> %> %> %> groupadd mysql useradd -g mysql mysql gunzip < mysql-VERSION.tar.gz | tar -xvf cd mysql-VERSION ./configure --prefix=/usr/local/mysql make make install cp support-files/my-medium.cnf /etc/my.cnf cd /usr/local/mysql bin/mysql_install_db --user=mysql chown -R root . chown -R mysql var chgrp -R mysql . bin/mysqld_safe --user=mysql &
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You can compile the Windows platform source code using Microsoft Visual Studio 2005 (some have had great success using Visual Studio 6.0 and 2005 Express Edition with the Microsoft platform development kit, but I have found Visual Studio 2005 to be more stable). To compile the system for the first time, open the mysql.dsw project workspace in the root of the source distribution tree and set the active project to mysqld classes and the project configuration to mysqld - Win32 nt. When you click Build mysqld, the project is designed to compile any necessary libraries and link them to the project you specified. Take along a fresh beverage to entertain yourself as it can take a while to build all of the libraries the first time. Regardless of which platform you use, your compiled executable will be placed in the client_release or client_debug folder depending on which compile option you chose. To run the new executable, simply stop the server service, copy the file to the bin folder under the MySQL installation, and restart the server service.
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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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Caution Most compilation problems can be traced to improperly configured development tools or
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missing libraries. Consult the MySQL forums for details on how to resolve the most common compilation problems.
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The first thing you will notice about your newly compiled binary (unless there were problems) is that you cannot tell that the binary is the one you compiled! You could check the date of the file to see that the executable is the one you just created, but there isn t a way to know that from the client side. Although this approach is not recommended by MySQL AB and probably shunned by others as well, you could alter the version number of the MySQL compilation to indicate it is the one you compiled. Let s assume you want to identify your modifications at a glance. For example, you want to see in the client window some indication that the server is your modified version. You could change the version number to show that. Figure 3-4 is an example of such a modification.
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Figure 3-4. Sample MySQL command cient with version modification Notice in both the header and the result of issuing the command, SELECT Version();, the version number returned is the same version number of the server you compiled plus an additional label I placed in the string. To make this change yourself, simply edit the set_server_version() function in the mysqld.cpp file, as shown in Listing 3-26. In the example, I have bolded the one line of code you can add to create this effect. Listing 3-26. Modified set_server_version Function static void set_server_version(void) { char *end= strxmov(server_version, MYSQL_SERVER_VERSION, MYSQL_SERVER_SUFFIX_STR, NullS); #ifdef EMBEDDED_LIBRARY end= strmov(end, "-embedded"); #endif #ifndef DBUG_OFF if (!strstr(MYSQL_SERVER_SUFFIX_STR, "-debug")) end= strmov(end, "-debug");
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