https://sourceware.org/bugzilla/show_bug.cgi?id=18963
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
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CC| |amodra at gmail dot com
--- Comment #3 from Alan Modra <amodra at gmail dot com> ---
Yes, Nick has it right, that code in new_rel_from_abs is the trigger for this
failure. But note that the truly bogus code is in fold_binary as described by
this comment:
/* Arithmetic operators, bitwise AND, bitwise OR and XOR
keep the section of one of their operands only when the
other operand is a plain number. Losing the section when
operating on two symbols, ie. a result of a plain number,
is required for subtraction and XOR. It's justifiable
for the other operations on the grounds that adding,
multiplying etc. two section relative values does not
really make sense unless they are just treated as
numbers.
The same argument could be made for many expressions
involving one symbol and a number. For example,
"1 << x" and "100 / x" probably should not be given the
section of x. The trouble is that if we fuss about such
things the rules become complex and it is onerous to
document ld expression evaluation. */
Fixing fold_binary is probably too risky in terms of destabilising people's odd
little linker scripts.
The new_rel_from_abs change came in here:
https://sourceware.org/ml/binutils/2012-06/msg00155.html It would be a shame
to lose the overall functionality of that change. Absolute symbols a really
not handled well in other parts of the toolchain. For example, glibc ld.so on
many targets doesn't treat them as absolute..
So I think that besides Nick's patch we also need another pass over linker
script symbols, to give them a section relative value. If nothing else, this
is going to be less work than all the ld testsuite updates needed with Nick's
current patch.
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