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gnatprep — Preprocessor for Ada source code files (part of the GNAT toolchain). More information: <https://gcc.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandadasourceclicodeforgnatpreppreprocessor

Problem

How to use the gnatprep command: Preprocessor for Ada source code files (part of the GNAT toolchain). More information: <https://gcc.gnu.org/onlinedocs/gnat_ugn/Preprocessing-with-gnatprep.html>.

Solution

gnatprep — Preprocessor for Ada source code files (part of the GNAT toolchain). More information: <https://gcc.gnu.org/onlinedocs/gnat_ugn/Preprocessing-with-gnatprep.html>.

Use symbol definitions from a file:

gnatprep {{source_file}} {{target_file}} {{definitions_file}}

Specify symbol values in the command-line:

gnatprep -D{{name}}={{value}} {{source_file}} {{target_file}}

Code Snippets

Use symbol definitions from a file

gnatprep {{source_file}} {{target_file}} {{definitions_file}}

Specify symbol values in the command-line

gnatprep -D{{name}}={{value}} {{source_file}} {{target_file}}

Context

tldr-pages: common/gnatprep

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