Makefile自动生成（Automake）

Makefile file makes compiling work more efficient, especially when it turns to solve some jobs with a complex structure. But
it depends on the building environment so hard that we can't use it portably. So that a tools called automake assist us to generate makefile
automatically.

Brief

1. autoscan
2. vim configure.scan and mv configure.scan configure.ac
3. aclocal
4. autoconf
5. vim Makefile.am
6. automake --add-missing
7. ./configure
8. make

Example

Project Layout

1. First of all, create a source code in C:

/* hello.c */
#include <stdio.h>

int main(int argc, char *argv[])
{
	fprintf(stdout, "Hello Auto Makefile
");
	return 0;
}

then autoscan it, you will find a file named configure.scan

$ autoscan
$ ls
hello.c configure.scan

2. edit configure.scan and rename it as configure.ac

$ vim configure.scan
$ cat configure.scan

#    -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_INIT( hello.c)
AM_INIT_AUTOMAKE(hello, 1.0)

# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_OUTPUT(Makefile)

$ mv configure.scan configure.ac

3. use aclocal to create aclocal.m4. m4 is a kind of marco processor.

$ aclocal
$ ls
aclocal.m4 configure.ac hello.c

4. use autoconf to generate configure

$ autoconfig
$ ls
aclocal.m4 autom4te.cache configure configure.ac hello.c

5. edit makefile.am

$ vim makefile.am
$ cat makefile.am
AUTOMAKE_OPTIONS=foreign
bin_PROGRAMS=hello
helloworld_SOURCE=hello.c

6. ./configure
7. ./make

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