http://woodruffscientific.com/wiki/ 2026-10-24T02:37:13+00:00 http://woodruffscientific.com/wiki/ http://woodruffscientific.com/wiki/lib/tpl/dokuwiki/images/favicon.ico text/html 2022-07-21T06:59:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://woodruffscientific.com/wiki/doku.php?id=wiki:make:basics&rev=1658408372&do=diff Basics To illustrate how Make works, here's the an example from our shell lecture: To analyse some molecule data we wrote two scripts: sorted_lengths.sh & middle.sh. sorted_lengths.sh determines the number of lines in each file and saves the files sorted by length in text/html 2022-07-21T06:59:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://woodruffscientific.com/wiki/doku.php?id=wiki:make:compile&rev=1658408372&do=diff Compiling Code To compile code we use a compiler. Popular choices for Fortran and C are either gcc or intel compilers. In this example we will look at compiling Fortran with gfortran. gfortran is an open source GNU compiler. It is actually more than just a compiler. When we call gfortran we are calling a compiler driver which decides what tasks to send to a fortran compiler, assembler and linker. Often we have a source code that consists of many different files. Subroutines in each file are cal… text/html 2022-07-21T06:59:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://woodruffscientific.com/wiki/doku.php?id=wiki:make:introdution&rev=1658408372&do=diff Make A common way to work with research codes is the following: * Fix a bug or add a feature by editing source files. * Recompile the source files into executable form * Run the executable MHD codes are made up of many files of Fortran and / or C++. If we want to fix a bug or add a feature to one of the files we have to recompile the program. However, the files contain subroutines, functions, classes, etc. that are called by code in other files. I.e. they all depend on each other. We h… text/html 2022-07-21T06:59:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://woodruffscientific.com/wiki/doku.php?id=wiki:make:patterns_rules&rev=1658408372&do=diff Automatic Variables We have some redundancy in our current makefile. We repeat the dependencies in the command. We can remove this redundancy by using the somewhat cryptic $^. $^ is an automatic variable: it means “all the prerequisites of this rule