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Re: One cause of spurious rebuilds

On Sun, Nov 02, 2003 at 01:57:51PM -0500, Daniel Jacobowitz wrote:
> A result from the changed mkdep handling.  When math/m_isinf.o is first
> built, there is no .d file for it.  The "m_%.c: sysdeps/foo_%.c" rule
> triggers, and math/m_isinf.c is created as an intermediate dependency. 
> Therefore it's removed when we're done with it.
> During a second time through make, the .d is loaded.  m_isinf.o now
> explicitly depends on m_isinf.c, so it is not an intermediate file; so the
> fact that it is missing can no longer be ignored.  It is built, and this
> time left around.  libm is rebuilt.
> Solution?  I'm not sure; you might think that this would work:
> .INTERMEDIATE: $(foreach s,.c .S l.c l.S f.c f.S,$(calls:s_%=$(objpfx)m_%$s))
> but it doesn't; it declares that there is an intermediate target with each
> of those names, and in fact there are only intermediate targets with half of
> those names.  This causes it to try to build m_isinf.S instead of m_isinf.o.
> I hate recursive make.

Oh, just ".SECONDARY:" with no dependencies will do it; I don't know if
that's acceptable.  If it is it should probably just go in Makerules.

Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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