b7d763c8ad
- Use xz-compressed tarball - Use PORTEXAMPLES - Convert to options target helper - Use REINPLACE_CMD instead of patch files - Update pkg-descr - Update WWW: use https:// - Cosmetic change
15 lines
885 B
Text
15 lines
885 B
Text
GNU M4 is an implementation of the traditional Unix macro processor. It is
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mostly SVR4 compatible although it has some extensions (for example, handling
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more than 9 positional parameters to macros). GNU M4 also has built-in functions
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for including files, running shell commands, doing arithmetic, etc.
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GNU M4 is a macro processor in the sense that it copies its input to the output
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expanding macros as it goes. Macros are either builtin or user-defined and can
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take any number of arguments. Besides just doing macro expansion, m4 has builtin
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functions for including named files, running UNIX commands, doing integer
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arithmetic, manipulating text in various ways, recursion etc... m4 can be used
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either as a front-end to a compiler or as a macro processor in its own right.
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One of the biggest users of GNU M4 is the GNU Autoconf project.
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WWW: https://www.gnu.org/software/m4/m4.html
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