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Introduction
************

This manual documents the use of 'gfortran', the GNU Fortran compiler.
You can find in this manual how to invoke 'gfortran', as well as its
features and incompatibilities.

Introduction
Part I: Invoking GNU Fortran
Invoking GNU Fortran
Command options supported by 'gfortran'.
Runtime
Influencing runtime behavior with environment variables.
Part II: Language Reference
Fortran standards status
Fortran 2003, 2008 and 2018 features supported by GNU Fortran.
Compiler Characteristics
User-visible implementation details.
Extensions
Language extensions implemented by GNU Fortran.
Mixed-Language Programming
Interoperability with C
Coarray Programming
Intrinsic Procedures
Intrinsic procedures supported by GNU Fortran.
Intrinsic Modules
Intrinsic modules supported by GNU Fortran.
Contributing
How you can help.
Copying
GNU General Public License says
how you can copy and share GNU Fortran.
GNU Free Documentation License
How you can copy and share this manual.
Funding
How to help assure continued work for free software.
Option Index
Index of command line options
Keyword Index
Index of concepts