---
name: "fort77"
section: "1"
platform: "linux"
package: "fort77"
version: "1.15-13"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/fort77"
---

# fort77(1)

invoke f2c Fortran translator transparently, like a compiler

## NAME

fort77 - invoke f2c Fortran translator transparently, like a compiler

## SYNOPSIS

**fort77** \[**-c**\] \[**-g**\] \[**-v**\] \[**-k**\] \[**-P**\] \[**-cpp**\] \[**f2c option ...**\] \[**-L** *directory ...*\] \[*gcc-option ...*\] \[*link option ...*\] \[**-O** *optlevel*\] \[*-o* *outfile*\] \[**-s**\] \[**-w**\] \[**-Wx,arg1**\[**,arg2**\]...\] *file ...*

## DESCRIPTION

The **fort77** script invokes the **f2c** command transparently, so it can be used like a real Fortran compiler. It can be used to compile Fortran, C and assembler code, and to link it with the f2c libraries.

File arguments ending with **.f** are compiled as Fortran source files. Files which end with **.P** are passed through to f2c, and files ending with **.F** are passed to the C preprocessor (invoked as "**/lib/cpp -traditional**"**)** first.  Any switches passed via **-D** will be passed to the preprocessor. If the translation is successful, the resulting C files will be passed to *cc* for translation into an object file. Files ending in **.c**, **.C**, **.cc**, **.i**, **.s**, **.S**, **.m**, **.cc** or **.cxx** are passed to the GNU C compiler directly; see *[gcc(1)](/gcc/1.md)*. All other files are passed to the linker.

## OPTIONS

- **-c**

  Supress linking and produce an object ( **.o** ) file from each source file.

- **-g**

  Include debugging information. **-v** Be verbose; supplying this twice will also tell the C compilers etc to be verbose.

- **-k**

  Keep the C files generated by f2c around.

- **-cpp**

  Pass Fortran code through the C preprocessor, as if filenames ended in **.F**.

- **-P**

  Generate f2c *.P*  files.

- **-L***directory*

  Include *directory* in the search for libraries in the final linking stage.

- **-o outfile**

  Send output to **outfile**.

- **-trapuv**

  Have f2c generate code to trap uninitialized values.

- **-Wx,arg1**\[,**arg2**...\]

  Pass the argument\[s\] **argi** through to the subprocess **x**, where **x** can assume one of the following values: **f** for the f2c step, **p** for the preprocessing step, **c** for the C compiler, **a** for the assembler (this is actually passed to the C compiler, too), and **l** for the linker. As an example, defining a preprocessor constant for the C compilation step would be done with **-Wc,-DUNIX=1**. Specifying the **-f** option to f2c would be done via **-Wf,-f**.

- **f2c option**

  **fort77** passes through almost all **f2c** options: **-C**, **-U**, **-u**, **-a**, **-E**, **-h**, **-P**, **-R**, **-r**, **-z**, **-I2**, **-I4**, **-onetrip**, **-!c**, **-!l**, **-!P**, **-!R**, **-ext**, **-!bs**, **-W\[n\]**, **-trapuv**, **-w8**, **-r8** and **-w66**.

- **gcc options**

  The following options are passed through to gcc: **-f\***, **-W\***, **-U\***, **-A\***, **-m\***, **-S**, **-E**, **-v**, **-x**, **-pipe**, **-o**, **-I**, **-V**, **-b\***, **-p**, **-pg**.

- **linker option**

  The options passed to the linking stage are **-static**, **-shared**, **-v**, **-V**, and **-symbolic**.

## BUGS

To make debugging work, you need to set a breakpoint at **MAIN\_\_** before you start.

**f2c** This script automatically supplies the **-I.** option to **f2c**. Older versions of **f2c** may not support this.

This script is for the interaction of gcc and f2c; using it with another compiler will probably require modification.

The **fort77** script does not strictly conform to Posix.2, because it acceppts long options with one leading slash.  This is done for gcc compatibility.

## SEE ALSO

[**f2c**(1)](/f2c/1.md), [**cc**(1)](/cc/1.md), [**as**(1)](/as/1.md), [**ld**(1)](/ld/1.md)

## AUTHOR

Thomas Koenig, ig25@rz.uni-karlsruhe.de