SCONS 1.3.1 DOWNLOAD

If you want to specify a different program name, then as we've seen in the previous section you slide the list of source files over to the right to make room for the output program file name. By default, SCons initializes every new construction environment with a set of construction variables based on the tools that it finds on your system, plus the default set of builder methods necessary for using those tools. See the man page for the detailed contents of the returned objects; some of the more useful attributes are. Notice that the libfoo. This configuration, then, will have SCons print that it is Evaluating each file that it encounters in turn as it traverses the dependency graph:. While most developers are programming, this isn't a problem in practice, since it's unlikely that someone will have built and then thought quickly enough to make a substantive change to a source file within one second. SCons makes it easy to create libraries and to use them in the programs.

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And if you do, maybe you'd even consider contributing a section to the User's Guide so the next person looking for that information won't have to go through the same thing?

ParseFlags returns a dictionary containing the options distributed into their respective 1.3.11 variables. To avoid the use of a prefix within the name of the tool or filtering sys. Lastly, SCons provides a way to add multiple build variables to a Variables object at once. SCons will now display some useful text when the -h option is used:. If, however, one is a string and the other is a list, the string is added as a new element to the list.

Note that this file is actually executed like a Python script. Note, however, that installing a file is still considered a type of file "build. Then when we run SConsthe object sconw from the subsidiary subdirectories are all correctly archived in the desired library:. A more recent convention is that these options are available from the generic pkg-config program, which has common framework, error handling, and 13.1 like, so that all the package creator has to do is provide the set of strings for his particular package.

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1.31 There is, however, an important difference between an SConstruct file and a Makefile: SCons recognizes that the object files for the common1. So if, for example, a user were to only change a comment in a hello.

Because the keywords explicitly identify what each argument is, you can actually reverse the order if you prefer:. Sometimes, however, this is not what you want. Being not a full-fledged C preprocessor, the scanner does not expand the macro. For example, suppose that you want users to set a RELEASE construction variable on the command line whenever the time comes to build a program for release, and that the value of this scohs should be added to the command line with the appropriate -D option or other command line option to pass the value to the C compiler.

These subsidiary scripts can, in turn, use the SConscript function to include still other scripts in the build. For example, a top-level SConstruct file might arrange for four subsidiary scripts to be included in the build as follows:. Now, the above example is a little contrived, because it's hard to imagine a real-world situation where you wouldn't want to rebuild hello if the hello. Specifically, this means --implicit-cache instructs SCons to not rebuild "correctly" in the following cases:.

Normally, this dictionary would be passed to MergeFlags to merge the options into a construction environmentbut the dictionary can be edited if desired to provide additional functionality. SCons, like most build tools, returns zero status to the shell on success and nonzero status on failure.

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For example, if we arbitrarily want to build one program using MD5 checkums and another using file modification times from the same source we might configure it this way:. Sometimes you may not know exactly which variable should be used for a particular option.

For example, you may simply need to verify that SCons is configured to supply the right options to the compiler, or a developer may want to cut-and-paste a compile command to add a few options for a custom test.

This can be done using the PrependUnique method:. Then, running SCons with the default target works as it always does, but explicity specifying the bar target on the command line generates the warning message:. This makes our SConstruct file portable again, the build output on Linux looking like:. You've already seen how SCons prints csons messages about what it's doing, surrounding the actual commands used to build the software:.

Because white space is not legal in Python variable names, the Export function will even automatically split a string into separate names for you:.

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The modification time of the dependency file the last time the target was built. Newer Pythons have significant improvements that help speed up the performance of SCons. Although SCons functions are forgiving about whether or not scojs use a string vs.

Internally, SCons represents all of the files and directories it knows about as Nodes. But, almost more importantly, sons attempt to set COLOR to a value that's not in the list generates an error message:.