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Cross-compilation is a technique in which a special compiler is used that runs on a desktop development system yet produces executables that run on a different platform. This enables developers to take full advantage of the CPU horsepower, memory, and storage available on their desktop development systems (known as host systems in cross-compilation lingo), while still producing executables that are tailored to the architecture, instruction set, and capabilities of their embedded system (known as target systems in cross-compilation terms). Because the GCC compilers have been ported to so many different types of desktop development systems and have also been fine-tuned to produce binaries for so many different types of systems in general, GCC is extremely well-suited for use as a cross-compiler everything that you need is already in there, you just have to tweak and build the compilers correctly. This is not to say that building cross-compilers is easy. A full desktop environment for crosscompilation requires not only special versions of the compilers, configured for cross-compilation, but also requires similarly configured versions of the utilities used to build application binaries and libraries (known as binutils) and a similarly configured version of the C library that holds most of the functions required by those applications and libraries. As I will explain throughout the remainder of this chapter, a variety of different ways to build cross-compilers are available today. The one that you choose depends on the operating system and the operating system distribution on which you are doing your development and the type of crosscompiler that you are trying to build. This chapter focuses on the most popular open source tools for

You can create two different types of CLR user-defined functions: scalar and table-valued It is most likely that the former will be more beneficial for performance in CLR than the latter This is because table-valued functions are used to query database data, and they should therefore never be replaced by CLR equivalents If your solution requires a table result set from an external file or resource, CLR UDFs may fit your needs well, particularly if you need to reference the external data in the FROM clause of your query (something that a CLR stored procedure would not allow) Using CLR for scalar UDF functions that don t focus on data retrieval from SQL Server may often perform quite well over a Transact-SQL equivalent As explained in the introduction at the beginning of the chapter, you ll benefit most from CLR when using it to execute high-complexity computational operations.

CLR scalar UDFs are also useful for operations that simply aren t possible using Transact-SQL (for example, accessing external data or using NET library functionality that doesn t exist in Transact-SQL) In this example, an assembly is created that contains a class and method intended for use with a CLR user-defined scalar function I m going to take advantage of the SystemTextRegularExpressions NET framework namespace This contains a class called Regex, which will allow us to break apart a single string into an array of values based on a specific delimiter Regular expression functionality, which is often used for pattern matching, isn t built into SQL Server 2005, but now, with CLR integration, you can safely and efficiently use the regular expression libraries written for VBNET The goal of this example is to create a scalar UDF that takes three parameters.

building cross-compilers crosstool and buildroot and also discusses how to manually build crosscompilers when necessary. Other tools for building cross-compilers are also available, such as Gentoo s crossdev project (http://dev.gentoo.org/~redhatter/misc/xdistcc.sh.gz) and DENX Software Engineering s ELDK (Embedded Linux Development Kit) (http://www.denx.de/wiki/DULG/ELDK), but are not discussed here because they are too distribution-specific or less commonly used than the other approaches discussed in this chapter.

The first parameter is a delimited string of values The second parameter is the delimiter character used to separate the string The third parameter is the value from the array that I would like to select I ll walk through the code in more detail in the How It Works section, but in the meantime, this example compiles the following code using vbcexe:.