Build a Trivial Program

This is an example showing how to create and build a trivial program. First your account, environment and sandbox need to be established. After that you can create and build programs in any directory. First create a directory for your test program.

> mkdir  testprog
> cd  testprog

Edit a new file testprog.cpp and add this program:

 #include <stdio.h>

 int main(int argc, char **argv)
 {
   printf("hello world\n");
   return 0;
 }

Edit another file named Makefile and add:

 # The project name is used to create directory names.  For consistency
 # make this the same name as the top level directory for the project.
 #
 PROJECT = testprog

 # This is the name of the generated executable file.
 # There can be more than one program listed per directory.
 #
 PROGRAM = testprog


 # For each program with C++ sources set a variable using the program name.
 # By convention the source file containing the "main" entry point has the
 # same name as the program.
 #
 CXXtestprog = testprog.cpp


 # This brings in the G Build make files and is required.
 #
 include  $(G)/common/build/make/directory.make

Use make to build the program. It will create the obj directory with an optimized version (testprog-gcc4), a debugging version (testprog-gcc4_g) and a profiling version (testprog-gcc4_p). Note that on Windows the programs will have "cl9" for the compiler id and an ".exe" suffix.

> make
   :
> ls obj/test*
obj/testprog-gcc4*  obj/testprog-gcc4_g*  obj/testprog-gcc4_p*

You can then run the program with:

> obj/testprog-gcc4
hello world

If you want to delete the build output run:

> make  clean