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12.4 Indenting Directives

Sometimes you may want to indent particular preprocessor directives (e.g. #pragma) as though they were statements. To do this, first set up c-cpp-indent-to-body-directives to include the directive name(s), then enable the “indent to body” feature with c-toggle-cpp-indent-to-body.

User Option: c-cpp-indent-to-body-directives ¶

This variable is a list of names of CPP directives (not including the introducing ‘#’) which will be indented as though statements. Each element is a string, and must be a valid identifier. The default value is ("pragma").

If you add more directives to this variable, or remove directives from it, whilst “indent to body” is active, you need to re-enable the feature by calling c-toggle-cpp-indent-to-body for these changes to take effect⁵².

Function: c-toggle-cpp-indent-to-body ¶

With M-x c-toggle-cpp-indent-to-body, you enable or disable the “indent to body” feature. When called programmatically, it takes an optional numerical argument. A positive value will enable the feature, a zero or negative value will disable it.

You should set up c-cpp-indent-to-body-directives before calling this function, since the function sets internal state which depends on that variable.