Re: [PATCH 1/2] mark functions with const and pure attributes

[Paul Eggert]

One other thing, and this is more important.  The declarations
should be marked.  For example, the declaration of argmatch
should be marked with _GL_ATTRIBUTE_PURE (or _GL_PURE)
in argmatch.h.  We mark functions partly so that callers
can be optimized better, but typically this works for
other compilation units only if the pure mark is in the .h file.

If the declaration in the .h file is marked, the definition
in the .c file need not be marked, though you may want to
do that anyway to help remind the reader that it's pure.

This affects Bruno's point that the lines all have enough room
for _GL_ATTRIBUTE_CONST etc.; I expect that point no longer holds
once declarations are marked.