- Introduction to GNU C and C++ Compilers
- Installing GNU Compiler
- Compiling a Program
- Linking a program
- Assembling a Program
- Handling Warning and Error messages
- Include files
- Creating Libraries
- Standard Libraries
- Compiling Pascal Programs
- Compiling Fortran Programs
- Other Compilers
- References and Resources
This chapter is from the book
This chapter is from the book
This chapter is from the book
3.11 Compiling Fortran Programs
The GCC family of compilers also includes g77 which acts as a front end to invoke gcc. The gcc compiler is used to compile Fortran programs. Consider the following simple hello.for Fortran program that write “Hello world” on standard output.
c This program is to display a string and then end
c Written to demonstrate Fortran program compilation
c
c Rafeeq Rehman, March 18, 2002
program hello
write (*,*) 'Hello world'
stop
end
Note that statements in Fortran start from column 7. All lines starting with c in column 1 are comment lines. You can compile this program using the following command:
g77 hello.for
The g77 compiler, like gcc, creates a.out as a default output executable. You can create output file with a different name using –o command line option. The following command creates “kaka” as output binary executable file.
g77 hello.for –o kaka
The g77 program uses many programs to generate output binary. You can display version information by using g77 –v command. Output of this command is shown below.
[rr@conformix 4]$ g77 -v g77 version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (from FSF-g77 version 0.5.2620000731 (Red Hat Linux 7.1 2.96-81)) Driving: g77 -v -c -xf77-version /dev/null -xnone Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) /usr/lib/gcc-lib/i386-redhat-linux/2.96/tradcpp0 -lang-fortran -v -D__GNUC__=2
As you can see, it takes the help of gcc to compile programs. Note that Fortran programs have .for or .f at the end of the name of the program file.
As with gcc, you can create intermediate assembled or object code with g77. See manual pages of g77 for more information.