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--- software_carpentary2 [2011/06/20 04:15]
medhamsh
+++ software_carpentary2 [2011/06/20 04:23]
medhamsh
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 There are several other switches to the make utility. For more info, man make.
+===== Build Process =====
+. Compiler takes the source files and outputs object files
+. Linker takes the object files and creates an executable
+==== Compiling by hand ====
+The trivial way to compile the files and obtain an executable, is by running the command:
+<code>
+g++ main.cpp hello.cpp factorial.cpp -o hello
+</code>
+==== The basic Makefile ====
+The basic makefile is composed of:
+<code>
+target: dependencies
+[tab] system command
+</code>
+This syntax applied to our example would look like:
+<code>
+all:
+	g++ main.cpp hello.cpp factorial.cpp -o hello
+</code>
+==== Using variables and comments ====
+You can also use variables when writing Makefiles. It comes in handy in situations where you want to change the compiler, or the compiler options.
+<code>
+# I am a comment, and I want to say that the variable CC will be
+# the compiler to use.
+CC=g++
+# Hey!, I am comment number 2. I want to say that CFLAGS will be the
+# options I'll pass to the compiler.
+CFLAGS=-c -Wall
+all: hello
+hello: main.o factorial.o hello.o
+	$(CC) main.o factorial.o hello.o -o hello
+main.o: main.cpp
+	$(CC) $(CFLAGS) main.cpp
+factorial.o: factorial.cpp
+	$(CC) $(CFLAGS) factorial.cpp
+hello.o: hello.cpp
+	$(CC) $(CFLAGS) hello.cpp
+clean:
+	rm -rf *o hello
+</code>

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