Info about setup test in README.md

README.md

 # Programming in C++ 2022
 
-Course material for the course "Programming in C++", 9 --13 May 2022, organized by the Jülich Supercomputing Centre, Forschungszentrum Jülich, Germany.
+Course material for the course "Programming in C++", 9 --13 May 2022,
+organized by the Jülich Supercomputing Centre,
+Forschungszentrum Jülich, Germany.
+
+
+# cxx2022
+
+You will need to pull from this repository periodically during this course.
+
+If your computer does not have "git", you will need to use the download
+button to the left of the "Clone" button in the gitlab page.
+
+## Recommended way of working with this material
+
+The downloaded or cloned material from this repository will be updated
+during the course days. You should keep one copy of the examples and
+exercises in the pristine form, and work on your own duplicates.
+For example, to work on the examples in Chapter1 of the companion book,
+do as follows:
+
+```bash
+    cd Book/chapter1
+    cp -r examples mine
+    cd mine
+    clang++ -std=c++20 math_functions.cc
+    ./a.out
+```
+
+Only examples (which includes some exercises) and solutions need to
+be duplicated. You don't need to clone the entire material as that
+includes the PDFs of the book, course slides and other utillities.
+
+
+## Testing your set up
+
+To work with this material, you will need to have a fairly up-to-date
+C++ compiler. GCC version 11.2 or Clang version 13.0 is recommended.
+Microsoft's Visual C++ compiler has excellent support for C++20, if
+you have the latest version installed. During the course, we will focus
+on using open source tools, which are available to everyone, rather
+than proprietary tools.
+
+To test your setup, proceed as follows:
+
+```bash
+    cd wherever_you_downloaded_or_cloned_this_thing
+    cd test_your_setup
+    g++ hello.cc -o hello.gcc
+    ./hello.gcc
+    clang++ hello.cc -o hello.clang
+    ./hello.clang
+    g++ -std=c++20 hello_c++20.cc -o hello_cxx20.gcc
+    ./hello_cxx20.gcc
+    clang++ -std=c++20 hello_c++20.cc -o hello_cxx20.clang
+    ./hello_cxx20.clang
+```
+
+And finally to test if your compiler can at least partially
+handle C++20 modules, try the two remaining examples:
+
+```bash
+    clang++ -std=c++20 -stdlib=libc++ -fmodules hello_m.cc -o hello_m.clang
+    ./hello_m.clang
+    clang++ -std=c++20 -stdlib=libc++ -fmodules hello_c++20_m.cc -o hello_cxx20_m.clang
+    ./hello_cxx20_m.clang
+
+    g++ -std=c++20 -fmodules-ts -xc++-system-header iostream
+    g++ -std=c++20 -fmodules-ts -xc++-system-header concepts
+    g++ -std=c++20 -fmodules-ts hello_m.cc -o hello_m.gcc
+    g++ -std=c++20 -fmodules-ts hello_m.cc -o hello_cxx20_m.gcc
+    ./hello_m.gcc
+    ./hello_cxx20_m.gcc
+```
+
+# Using aliases to save some typing
+
+As the above examples show, we will often need to type a
+lot of options to compile our programs during this course,
+since we want to use C++20, which is not the default
+standard for the compilers yet. A vew convenient aliases
+have been prepared which you can use to shorten the
+above compilation steps. To use them, do as follows:
+
+```bash
+source course_material_dir/code/bash/aliases.sh
+```
+
+Once you have done that, you can shorten the above 
+steps to the following: 
+
+```bash 
+C hello.cc 
+C hello_c++20.cc 
+
+Cm hello_m.cc
+Cm hello_c++20.cc 
+
+Gh iostream 
+Gh concepts 
+Gm hello_m.cc 
+Gm hello_c++20_m.cc
 
 

test_your_setup/hello.cc

@@ -4,4 +4,3 @@ auto main() -> int
 {
     std::cout << "Hello, world!\n";
 }
-