Setting CFLAGS values in sysdeps makefiles

[Mike Frysinger]

On Wednesday 28 November 2012 20:18:09 Joseph S. Myers wrote:
> To make this sort of thing work, should the CFLAGS-* settings in
> posix/Makefile be made to use "+=", or should they be moved higher up the
> file, or the Rules inclusion moved down, or would some other approach be
> best?  And is there any general rule for what order the contents of the
> subdirectory Makefile (including the "include ../Makeconfig" and "include
> ../Rules") should go in?

seems like relying on ordering can be fragile and we should just always use 
+=.  it isn't like we have to worry about the variable being set in the 
environment since "-" isn't a valid char in a variable name.
-mike
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