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This section describes the command-line options that are only meaningful for Objective-C and Objective-C++ programs. Because Objective-C is a superset of C, you can also use C language options when compiling Objective-C programs, as well as the language-independent GCC options that are discussed in Appendix A. Similarly, you can use C++ language options when compiling Objective-C++ applications. A sample example of compiling an Objective-C program using gcc is the following: gcc lobjc o hello hello.m This example compiles the program shown in Listing 1-4, producing an executable named hello. If you neglect to include the Objective-C runtime library, you will see error output about undefined references, as in the following:

The example started off by creating two tables (using INTO) that contain overlapping sets of rows. The first table, TableA, contained the first twenty rows (ordered by ProductID) from the Production. Product table. The second table, TableB, also received another twenty rows, half of which overlapped with TableA s rows. To determine which rows exist only in TableA, the EXCEPT operand was placed after the FROM clause of the first query and before the second query: SELECT FROM EXCEPT SELECT FROM ProductID, Name TableA ProductID, Name TableB

Listing 1-4. Sample Error Messages from a Missing Objective-C Library $ gcc hello.m -o hello /tmp/ccxAki59.o: In function `main': hello3.m:(.text+0x2b): undefined reference to `objc_get_class' hello3.m:(.text+0x3b): undefined reference to `objc_msg_lookup' hello3.m:(.text+0x5d): undefined reference to `objc_msg_lookup' hello3.m:(.text+0x81): undefined reference to `objc_msg_lookup' /tmp/ccxAki59.o: In function `__objc_gnu_init': hello3.m:(.text+0xab): undefined reference to `__objc_exec_class' /tmp/ccxAki59.o:(.data+0x208): undefined reference to `__objc_class_name_Object' collect2: ld returned 1 exit status You must always specify the lobjc option when linking an Objective-C program using gcc so that gcc links in the Objective-C runtime library. The gcc compiler also provides a number of options that are unique to compiling Objective-C and Objective-C++ programs. These options are shown in Table 1-3.

In order for EXCEPT to be used, both queries must have the same number of columns. Those columns also need to have compatible data types (it s not necessary that the column names from each query match). The power of EXCEPT is that all columns are evaluated to determine if there is a match, which is much more efficient than using INNER JOIN (which would require explicitly joining the tables on each column in both data sources). The results of the EXCEPT query show the first nine rows from TableA that were not also populated into TableB. In the second example, INTERSECT was used to shows rows that overlap between the two tables. Like EXCEPT, INTERSECT is placed between the two queries: SELECT ProductID, Name FROM TableA INTERSECT SELECT ProductID, Name FROM TableB The query returned the eleven rows that overlapped between both tables. The same rules about compatible data types and number of columns apply to INTERSECT as for EXCEPT.

Specifies the name of the class (class-name) to use as the name of the constant string class. See the Constant String Objects section later in this chapter for more information about defining constant strings and specifying a different name for the constant string class. If the -fconstant-cfstrings option is also specified, it will override any -fconstant-string-class setting and cause @"string" literals to be laid out as constant CoreFoundation strings. Causes gcc to generate object code compatible with the standard GNU Objective-C runtime. This is the default on most systems except for gcc running on the Darwin and Mac OS X platforms. Generates output compatible with the NeXT runtime. This is the default for Darwin and Mac OS X systems. The macro __NEXT_RUNTIME__ is predefined if this option is used so that applications can identify and target the NeXT runtime. Causes gcc to assume that the receiver is valid in all Objective-C message instructions ([receiver message:arg]), enabling the use of more efficient entry points in the runtime. This option is only available if you are using the NeXT runtime on Mac OS X 10.3 and later systems. Enables syntactic support for structured exception handling in Objective-C, much like that provided by C++ and Java. This option is only available if you are using the NeXT runtime on Mac OS X 10.3 and later systems. See the section titled Structured Error Handling later in this chapter for more information.

This recipe demonstrated returning the language for the SQL Server instance. This will vary based on the locale and collation used to set up the SQL Server instance.

Now that you have ImageMagick installed and configured, you should know some final useful points before getting going with the rest of the book. The following sections discuss accessing online help, debugging output, creating verbose output, and determining which version of ImageMagick is installed on a machine.