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Although using make is worth a book in itself, 4 this section looks at make through the lens of a user who is already a little familiar with the tool Make is a tool that looks at a target and dependencies and figures out what steps are necessary to create the target if it s out of date with its dependencies The notion of out of date means the file system has a date on a dependency that s newer than the target file Make then looks to see if there s a rule to rebuild the dependency, first by name then by file extension A make rule looks like this: output-file: input1o input2o input3o $(CC) $^ -o $@ This line is read, output-file is made from input1o input2o and input3.

Note This is the point where problems may occur due to issues with hard drives, memory, and other

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o and means that make attempts to be sure that on the file system, the dependencies are up to date before running this rule To help you be more productive, make has a large number of predefined rules; the author of a make file doesn t need to write much in the make file to get something built This has disadvantages in that a make file seems to work by magic, because you haven t specified much of anything but make still seems to have enough information to build something One of the most confusing aspects of make files is the usage of environment variables and how those affect make When make starts, all environment variables become make variables Make sets defaults for some variables so that the predefined rules work on most targets Make s rules then use these variables to execute tools to build dependencies.

screen.blit(background, (0,0)) screen.blit(sprite, (x, 100)) x+= 10. # If the image goes off the end of the screen, move it back if x > 640.: x = 640. pygame.display.update() If you run Listing 5-1, you will see the fugu image sliding from left to right. This is exactly the effect we were looking for, but there is a flaw in the design for Listing 5-1. The problem is that we can t know exactly how long it will take to draw the image to the screen. It looks reasonably smooth because we are creating an extremely simple frame, but in a game the time to draw a frame will vary depending on how much activity there is on screen. And we don t want a game that slows down just as it is getting interesting. Another problem is that the sprite in Listing 5-1 will move more slowly on less powerful computers and more quickly on more capable machines.

components. If you get an error message at this point (or any other in the setup), go to the Troubleshooting Setup section toward the end of this chapter for more information, and then return to Step 3 after you have resolved the issue.

In the previous example, the tool $(CC) defaults to the value of cc, which is a symlink to GCC on most systems For embedded projects, you can still use the standard make file rules, but some make variables need to be changed so that they point to the cross-compiler and not the native tools on the system Table 8-4 lists the most frequently reset variables..

Instrumenting code is something that almost everyone has done and is a very effective way of debugging on machines with limited resources; the code for printing out something to the console is probably already part of the application. Adding a few more lines of output doesn t demand much in terms of memory or resources. Instrumentation is as simple as putting a print statement in the code, running the program, and watching the results. Some target machines don t have the resources necessary to run even a small program like gdbserver to host a debugging session. Instrumentation is also the best way to find bugs that appear at odd intervals or to solve timing-related problems, where interactively debugging skews the results of the program.

Figure 2-2. Setup is initializing. 3. After initialization is complete, you are presented with the Welcome to Windows Home Server Setup screen, shown in Figure 2-3. Click Next to continue.

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