C++ for Scientists - Technische Universität Dresden

Programming tools
Chapter 10
In this chapter we introduce programming tools that can be used to solve the exercises.
10.1 GCC
GCC stands for the Gnu Compiler Collection. It is a collection of compilers (C, C++, FOR-
TRAN, Fortran 90, java) free of charge [?]. The C++ compilers are very good and produce
reasonably efficient code. In this section, we explain how to compile a C++ program.
The following command:
g++ -o hello hello.cpp
compiles the C++ source file hello.cpp into the executable hello.
The compiler command is gcc or g++ with the following options.
• -Idirectory: Include files directory
• -O: Optimization
• -g: Debugging
• -p: Profiling
• -o filename: output file name
• -c: Compile, no link
• -Ldirectory: Library directory
• -lfile: Link with library libfile.a
Here is another example:
g++ -o foo foo.cpp -I/opt/include -L/opt/lib -lblas
compiles and links the file foo.cpp using include files from /opt/include/ (option -I) and
linked with a library that is situated in the directory /opt/lib: For optimizing code, we have
to use the compilation options :
-O3 -DNDEBUG
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