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bug#31744: 26.1; Improvements to make tags and make -C test

From: Noam Postavsky
Subject: bug#31744: 26.1; Improvements to make tags and make -C test
Date: Fri, 08 Jun 2018 21:12:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

>>> * src/Makefile.in: Create TAGS files in ${srcdir}, not build dir.
>> I'm not sure I agree with this.  Other projects I looked at produce
>> TAGS in the build directory (but reference source files in srcdir, of
>> course).  Why do you think TAGS should go to the source directory?

Oh, hmm.  The original reason, is that when looking at a source file in
Emacs, and then hitting M-. I get a prompt to visit the TAGS table,
which starts from the source directory.  Then I have to go looking for
the TAGS file in the corresponding build directory.  This seems kind of
silly, especially since every build directory will have identical TAGS
files anyway (meaning I either have to make TAGS redundantly per-build
directory, or remember exactly which build directory has the TAGS file).

I saw the FIXME in Makefile.in, so I assumed (oops!) this was some
well-known problem, and that nobody had bothered to make the obvious fix

> They should not. Source should be able to be mounted read-only, and
> all build products should be stored elsewhere.

Emacs puts .elc files in the source directory.  I was under the
impression that the general principal is that arch & config dependent
files go in the build directory, and arch & config independent ones go
in the source directory.

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