Make in Java

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Notice how dependencies are like subroutines, so each sub-rule makes a sub-target. In the end, the aim is to combine all of the sub-targets into one final target. There are two important things to remember: The file names must start on the first character of a line. There must be a TAB character at the beginning of every rule or action. If there are spaces instead of tabs, or no tab at all, make will signal an error. This bizarre feature can cause a lot of confusion.
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Let's look at an example Makefile for a program which consists of two course files main. c and other . c, and which makes use of a library called libdb which lies in the directory /usr/local/lib. Our aim is to build a program called database:
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# Simple Makefile for 'database' # # First define a macro OBJ = main, o other . o
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CC = gcc CFLAGS = -I/usr/local/include LDFLAGS = -L/usr/local/lib -Idb INSTALLDIR = /usr/local/bin
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# # Rules start here. Note that the $@ variable becomes the name of # the executable file. In this case it is taken from the $OBJ # variable #
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database: $OBJ $CC -o $@ $OBJ $LDFLAGS
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# If a header file changes, normally we need to recompile # everything. There is no way that make can know this unless we # write a rule which forces it to rebuild all .o files if the # header file changes. . . # $OBJ: $HEADERS
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# # As well as special rules for special files we can also define a # "suffix rule" . This is a rule which tells us how to build all # files of a certain type. Here is a rule toget .ofilesfrom.c # files. The $< variable is like $ but is only used in suffix #rules. #
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. C .0 :
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$CC -c $CFLAGS $<
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Appendix C: Programming and Compiling
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########################################################## #Clean up ##########################################################
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# # Make can also perform ordinary shell command jobs # "make tidy" here performs a cleanup operation #
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rm -f $OB J rm -f y. tab. c lex . yy. c y. tab .h rm -f y. tab lex . yy rm -f *% *~ *.o make tidy
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install: $INSTALLDIR/database cp database $INSTALLDIR/database The Makefile above can be invoked in several ways: make make database make clean make install If we simple type make (i.e. the first of these choices), make takes the first of the rules it finds as the object to build. In this case the rule is 'database', so the first two forms above are equivalent. On the other hand, if we type make clean then execution starts at the rule for 'clean', which is normally used to remove all files except the original source code. Make 'install' causes the compiled program to be installed at its intended destination. mak e uses some special variables (which resemble the special variables used in Perl but don't confuse them). The most useful one is $@ which represents the current target or the object which make would like to compile, i.e. as make checks each file it would like to compile, $ @ is set to the current file name: $ @ This evaluates to the current target, i.e. the name of the object you are currently trying to build. It is normal to use this as the final name of the program when compiling. $ This is used only outside of suffix rules, and means the name of all the files which must be compiled in order to build the current target: target: filel.ofile2.o TAB cc -o $@ $ $ < This is only used in suffix rules. It has the same meaning as $ but only in suffix rules. It stands for the prerequisite, or the file which must be compiled in order to make a given object.
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Note that, because make has some default rules defined in its configuration file, a singlefile C program can be compiled very easily by typing
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make filename. c This is equivalent to cc -c f i l e n a m e . c cc -o filename filename, o
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Perl
To summarize Perl, we need to know about the structure of a Perl program, the conditional constructs it has, its loops and its variables. In the latest versions of Perl (Perl 5), you can write object-oriented programs of great complexity. We shall not go into this depth, for the simple reason that Perl's strength is not as a general programming language but as a specialized language for text file handling. The syntax of Perl is in many ways like the C programming language, but there are important differences: Variables do not have types. They are interpreted in a context sensitive way. The operators which acts upon variables determine whether a variable is to be considered a string or as an integer, etc. Although there are no types, Perl defines arrays of different kinds. There are three different kinds of array, labelled by the symbols $, @ and % . Perl keeps a number of standard variables with special names, e.g. $_ @ARGV and %ENV. Special attention should be paid to these. They are very important! The shell reverse apostrophe notation 'command' can be used to execute Unix programs and get the result into a Perl variable.
Here is a simple 'structured hello world' program in Perl. Notice that subroutines are called using the & symbol. There is no special way of marking the main program it is simply that part of the program which starts at line 1. #!/local/bin/perl # # Comments # &Hello(); SWorld; # end of main sub Hello { print "Hello " ; > sub World { print "World\n";