[PATCH] Fix ld segfault with -Map -Tdata=xxx (arm-none-symbianelf, and maybe other targets)

[Julian Brown]

Hi,

This patch fixes a segfault when -Map is used together with -Tdata=xxx 
with ld on arm-none-symbianelf. The crash doesn't occur when -Tdata 
isn't used.

The problem occurs when writing the map file; the call to 
ldexp.c:exp_fold_tree in ldlang.c:print_assignment returns 
result.section==0 and result.valid_p==true in the breaking case. The 
patch just stops the crashing code from being executed.

Tested with targets=all on i686-pc-linux-gnu.

OK to apply, or is something more deeply broken here?

Julian
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