[PATCH v2 0/2] LD: SEGMENT_START expression handling fixes

[Maciej W. Rozycki]

Hi Alan,

 I decided to complete this change after all.  I split it into a small 
patch series as an update you requested is logically separate.  See 
individual patch descriptions for further details.

 As for historical reasons my personal development environment has quite 
an old version of GCC testing these changes revealed a couple of build 
issues across 3 targets.  These turned out straightforward to fix, so I'll 
be proposing them separately, as I believe we have no need to artificially 
limit support for older compiler versions if that does not cause extra
maintenance burden, which is the case here.

 With those fixes in place I saw no regressions with this patch series in 
testing across my usual targets.

 OK to apply?

  Maciej