the -lbcm2835 is a flag to include a library (-l) bcm2835 which gcc will look for in the libraries directories that are defaulted by gcc more comments in your example...

On 2/9/18 9:23 AM, Forrest Christian (List Account) wrote:
gcc -o output hello.c

Will compile hello.c to an executable called output

You may need to add switches for libraries to include.

I'm skeptical that you'll be able to generate a bitstream with enough accuracy under Linux, without extreme programming measures.

I'd suggest a digilent chipkit wifire and the arduino ide for this.  You should be able to bitbang at least a T1 with this processor (500mhz)

On Feb 9, 2018 8:44 AM, <ch...@wbmfg.com <mailto:ch...@wbmfg.com>> wrote:

    OK, but I need a file called “make”, right?
    And it needs stuff inside it.
    This is one example I found:

        all: output_file_name
all means that everything is dependent on changes newer than this file
and if I type "make all" check that
        output_file_name: main.o
redo the "output_file_name" if main.o is newer and
what to do if I type "make output_file_name:
        gcc main.o -lbcm2835 -o output_file_name
how do do the redo
        main.o: main.c
main.o has to be newer than main.c
and what to do if I type "make main.o"
        gcc -c main.c
or gcc main.c
        clean: rm -rf *o output_file_name
what to do if I type "make clean"

    I presume this is like a batch file.
it's a set of dependancies...
    I am guessing it is a text file with the name make.
    I guess the output_file_name would be replaced with my “hello” or
    some such thing.
    Perhaps the “-lbcm2835” is the source code file?  -o is probably
    related to an object file.
    I know this is very elementary.  I can write C with ease.  Just
    getting over this initial hump.
    Like, where do you put the key in this car.
    (there used to be a car that you turned the key on, then floored the
    accelerator.  The starter button was part of the gas pedal and would
    not engage unless it was fully depressed.  )
    From: Bill Prince
    Sent: Friday, February 9, 2018 9:36 AM
    To: af@afmug.com <mailto:af@afmug.com>
    Subject: Re: [AFMUG] OT Hello World
    A make file is just a list of dependencies, and what to do if the
    dependency is met. Sort of:  "If hello.c is newer than hello, then
    compile it". It can be as simple as that, but can get a whole lot
    more complicated if there are libraries and such. However, in the
    simple case of your hello.c, I would put everything in the same
    directory. As the project grows, you would move your source (*.c)
    files into a "source" directory, and the binaries (*.bin) into a bin
    directory. Then linking all the binaries would be dependent on the
    dates of those file. So linking is dependent on the binaries, and
    the binaries are dependent on the sources.
    Make should be installed already.
    bp <part15sbs{at}gmail{dot}com>
    On 2/9/2018 6:51 AM, ch...@wbmfg.com <mailto:ch...@wbmfg.com> wrote:
    I hate make files.  I love IDEs.
    Bought a raspberry PI and am playing with it a bit.  So far I really
    like it.
    Started to write a program using a Geaney editor.  Nice editor. Hit
    the make button and I discovered it is really just a shell, that you
    have to have a gcc make somewhere.
    So, not being a linux hack, what folder should may source and other
    project files be in?
    Should the make file be there with it?
    Can someone please be kind enough to send me two things:
    1.  hello.c source
    void main {
         printf(“hello world”);
    }
    (I probably don’t need that as It is right there in this email.  But
    I do need to put it in the proper folder name and associate it with
    GCC presumably with the make file.
    2)    A make file that will allow that program to compile.
    Did I say I hate make files?
    I have downloaded example make files.  It appears I need to change
    some file names in them to match the file name of my source.  But I
    would like to make my Geany program be able to cause the make file
    to be correct if I change the name of the project.  Perhaps that is
    not possible.  One of my sons is trying to encourage me to put
    windows on it and use visual C++. I don’t want to do that because
    this is a simple bit banging project.
    I don’t care where the object files go or what they are named.
    If I want to include a .h file it will be in my source.
    My handicap comes from TurboC coming on the scene when I first
    started doing a bunch of c code writing.  Before that it was asm
    (before that it was fortran, pascal, basic)

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