[Bug ld/21523] Relocation for R_ARM_THM_ALU_PREL_11_0 is not calculated correctly

[clegg89 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21523

--- Comment #3 from clegg89 at gmail dot com ---
Created attachment 10071
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10071&action=edit
Test Case

The object file test.o contains two relocations, both of type
R_ARM_THM_ALU_PREL_11_0, as can be seen by arm-none-eabi-objdump:

arm-none-eabi-objdump -rd test.o:
test.o:     file format elf32-littlearm


Disassembly of section .text:

00000000 <getOtherValue>:
   0:   f2af 0004       subw    r0, pc, #4
                        0: R_ARM_THM_ALU_PREL_11_0      aValue
   4:   4770            bx      lr
        ...

00000008 <aValue>:
   8:   6854 7369 6920 2073 2061 6574 7473 000a     This is a test..

00000018 <getValue>:
  18:   f2af 0004       subw    r0, pc, #4
                        18: R_ARM_THM_ALU_PREL_11_0     aValue
  1c:   4770            bx      lr

When attempting to link this object file, the first relocation (in
getOtherValue) is performed without issue. However, the second relocation (in
getValue) throws an error:

test.o: In function `getValue':
test:(.text+0x18): relocation truncated to fit: R_ARM_THM_ALU_PREL_11_0 against
symbol `aValue' defined in .text section in test.o

Details on how to build the project can be found in README.md

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