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AM_CFLAGS and %reldir%

From: Thomas Martitz
Subject: AM_CFLAGS and %reldir%
Date: Fri, 5 May 2017 08:59:42 +0200


when transitioning a project to non-recursive Automake, using %reldir%, you lose the ability to define per-directory AM_{CPP,C,CXX,LD}FLAGS.

With recursive Automake, you can simply set AM_CFLAGS in each Attempting the same in a non-recursive setup would modify the single, global AM_CFLAGS, which may not be desirable.

The only solution seems to be to heavily expand the fragments:


bin_PROGRAMS = foo bar baz


bin_PROGRAMS += %D%/foo %D%/bar %D%/baz

%C_foo_CFLAGS = -g

%C_bar_CFLAGS = -g

%C_baz_CFLAGS = -g


This gets unwieldy in cases of many programs and libraries. As a side effect, Automake will emit explicit rules, making the Makefile even larger, though that's not much of a problem I think and is probably not avoidable.

Is there any other solution available? I have tried to define directory-level AM_CFLAGS, like

AM_%C%_CFLAGS = -g

(applying to all targets that start with %C% after expanding) but they are not used.

If there are no other solutions, would the above idea considered if someone posted a patch?

Best regards.

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