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3.2.8 Using gcc for Syntax Checking

-gnats

The s stands for syntax.

Run GNAT in syntax checking only mode. For example, the command

$ gcc -c -gnats x.adb

compiles file `x.adb' in syntax-check-only mode. You can check a series of files in a single command , and can use wild cards to specify such a group of files. Note that you must specify the -c (compile only) flag in addition to the `-gnats' flag. .

You may use other switches in conjunction with `-gnats'. In particular, `-gnatl' and `-gnatv' are useful to control the format of any generated error messages.

The output is simply the error messages, if any. No object file or ALI file is generated by a syntax-only compilation. Also, no units other than the one specified are accessed. For example, if a unit X with's a unit Y, compiling unit X in syntax check only mode does not access the source file containing unit Y.

Normally, GNAT allows only a single unit in a source file. However, this restriction does not apply in syntax-check-only mode, and it is possible to check a file containing multiple compilation units concatenated together. This is primarily used by the gnatchop utility (see section 7. Renaming Files Using gnatchop).