Handling of CONFIG_EXTRA_LDFLAGS in submakes

[Greg Whiteley]

Hi All,

I've run into trouble setting CONFIG_EXTRA_LDFLAGS in my config.  It is not
honoured in some of the sub-make files (first failure is in applets).  In
my specific case I'm selecting architecture-specific options that need to
be consistent across all build/link steps (in this case endian-selection).

The handling of CONFIG_EXTRA_LDFLAGS defined in a defconfig seems to be
different from the handling of CONFIG_EXTRA_(LDLIBS|CFLAGS).  Whereas
CONFIG_EXTRA_CFLAGS is loaded into CFLAGS by Makefile.flags
CONFIG_EXTRA_LDFLAGS is loaded into EXTRA_LDFLAGS.

Adding EXTRA_LDFLAGS to the list of exports in Makefile works around the
problem for me and ensures that the the flags are available to sub-makes.

I thought it worth noting to you, since as far as I can tell EXTRA_LDFLAGS
provides a slightly different service to LDFLAGS, and I'm not sure that my
workaround would be generally applicable. I think a longer term fix might
involve having different CONFIG_ options to override EXTRA_LDFLAGS
separately to LDFLAGS.

Cheers,

Greg
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