CVS log for src/usr.bin/make/metachar.c

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make: replace macro is_shell_metachar with inline function

No functional change.

make(1): remove do-not-format markers from comments

These markers had been used inconsistently.  Furthermore the source code
had not been formatted automatically before 2020 at all, otherwise there
wouldn't have been any trailing whitespace left.

make(1): remove comment about adding is_shell_metachar to ctype.h

This function is so specialized that it would be wrong to have it in a
general-purpose C header.

make(1): clean up RCSID blocks

These blocks mostly consisted of redundant structure, following the same
#ifndef pattern over and over, with only minimal variation.

It's easier to maintain if the common structure is only written once and
encapsulated in a macro.

To avoid "defined but unused" warnings from GCC in the case where
MAKE_NATIVE is not defined, I had to add volatile.  Adding
MAKE_ATTR_UNUSED alone would not preserve the rcsid variable in the
resulting binary.

make(1): replace end-of-line comments with block comments

Just in case someone wants to port the current NetBSD make to an ancient
compiler that knows only C90.

Adjust metachar handling to previous behaviour:
- space and tab are no shell metachars, remove them from generic
  metachar function
- add space and tab as to-be-quoted characters for :Q modifier
- add = and : as characters that require command handling by the shell

grr too many different compilation options.

this is not buf.c

Fix non native build on metachar.c

centralize shell metachar handling.