4.3. Building software from source

Procedure

1. Invoke the C compiler from the GNU Compiler Collection to compile the source code into binary:

   $ gcc -g -o cello cello.c

2. Run the resulting binary cello:

   $ ./cello
   Hello World

Procedure

1. Create the Makefile file with the following content in the same directory as cello.c:

   cello:
   	gcc -g -o cello cello.c
   clean:
   	rm cello

   Note that the lines under cello: and clean: must begin with a tabulation character (tab).

2. Build the software:

   $ make
   make: 'cello' is up to date.

3. Because a build is already available in the current directory, enter the make clean command, and then enter the make command again:

   $ make clean
   rm cello
   
   $ make
   gcc -g -o cello cello.c

   Note that trying to build the program again at this point has no effect because the GNU make system detects the existing binary:

   $ make
   make: 'cello' is up to date.

4. Run the program:

   $ ./cello
   Hello World

Procedure

1. Byte-compile the pello.py file:

   $ python -m compileall pello.py

2. Verify that a byte-compiled version of the file is created:

   $ ls __pycache__
   pello.cpython-311.pyc

   Note that the package version in the output might differ depending on which Python version is installed.

3. Run the program in pello.py:

   $ python pello.py
   Hello World

Procedure

1. Make the file with source code executable:

   $ chmod +x bello

2. Run the created file:

   $ ./bello
   Hello World