make in Java Include PDF417 in Java make

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make generate, create pdf417 2d barcode none on java projects Windows Forms Understanding make is an excellent too l to enhance your productivity. A well-written Makefile can make a huge difference in the speed of your development. Unfortunately, many developers have learned to use make through trial and error without ever reading.

1. 2. 3.

4. Cons (w PDF-417 2d barcode for Java ww.gnu.

org/software/cons/dev/cons.html) is short for Construction System. www. www.python.


Build Tools any documentation. j2ee PDF-417 2d barcode These individuals rely a great deal on intuition and luck, and that shows in their Makefiles. Chances are that you are one of them, so I will start with some basics and work into some very useful GNU extensions.


1 Makefile Basics: Rules and Dependencies Unlike traditional scripts, which execute commands sequentially, Makefiles contain a mixture of rules and instructions. Makefile rules have the following very simple form:. target: prerequisite commands The rule asserts a PDF-417 2d barcode for Java dependency that says that the target depends on the prerequisite. In the simplest form, the target consists of a single filename, and the prerequisite contains one or more filenames. If the target is older than any of its prerequisites, the commands associated with the rule are executed.

Typically, the commands contain instructions to build the target. A trivial example looks like the following:. foo: foo.c gcc -o foo foo.c Here, foo is the ta PDF-417 2d barcode for Java rget, and foo.c is the prerequisite. If foo.

c is newer than foo, or if foo doesn t exist, make executes the command gcc -o foo foo.c. If foo is newer than foo.

c, nothing happens. This is how make saves you time by not building targets that don t need to be built. In a more complicated example, the prerequisite of one rule can be the target in another rule.

In that case, those other dependencies must be evaluated before the current dependency is evaluated. Consider this contrived example:. # Rule 1 program: o bject.o gcc -o program object.o # Rule 2 source.

c: echo "main() {}" > $@ # Rule 3 object.o: source.c gcc -c source.

c -o $@ # Rule 4 program2: program2.c gcc -o program2 program2.c.

2 Building from Source Starting with an em pty directory, if you run make with no arguments, you will see the following output:. $ make echo "main() {}" > source.c gcc -c source.c -o object.o gcc -o program object.o evaluates the first rule it encounters in the Makefile and stops when the dependency is satisfied. Other rules are evaluated only if they are required to satisfy rule 1. The parsing takes place something like this:.

make rule 1: program r equires object.o. object.

o is the target of rule 3; evaluate rule 3 before checking the file date. If object.o is newer than program, build program with gcc.

rule 3: object.o requires source.c.

source.c is the target of rule 2; evaluate rule 2 before checking the file date. If source.

c is newer than object.o, build object.o with gcc.

rule 2: source.c doesn t have any prerequisites. If source.

c doesn t exist, build it with an echo command. Notice that the dependencies determine the order in which the commands execute. Other than the first rule, the order of the rules in the Makefile have no impact.

We could, for example, swap the order of rules 2 and 3 in the Makefile, and it will make no difference in the behavior. Notice also that rule 4 has no impact on the build. When the target for the first rule is determined to be up to date, make stops.

Because this does not need anything from rule 4, program2 is never built, and program2.c is not needed. That doesn t mean that rule 4 is superfluous or useless.

You could just as easily type make program2 to tell make to evaluate rule 4. Makefile rules can be independent of one another and still be useful. make can also build specific targets in the Makefile, which allows you to bypass the default rule.

This technique is the preferred way to build a single object in a.
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