[Bug gas/14600] New: Thumb: constant expression expected while expression is statically calculable

[binutils-bugs at qult dot net]

http://sourceware.org/bugzilla/show_bug.cgi?id=14600



             Bug #: 14600

           Summary: Thumb: constant expression expected while expression

                    is statically calculable

           Product: binutils

           Version: 2.24 (HEAD)

            Status: NEW

          Severity: minor

          Priority: P2

         Component: gas

        AssignedTo: address@hidden

        ReportedBy: address@hidden

    Classification: Unclassified





The following



  .Lstart:

  ldr r4, =0

  .Lend:

  ldr r4, =.Lend - .Lstart



fails with



  Error: constant expression expected -- `ldr r4,=.Lend-.Lstart'



I suppose that when parsing the local labels, the addresses aren't resolved,

but still, they should be resolved when parsing the expression '.Lend -

.Lstart'.



If I use an intermediate local symbol,



  .Lstart:

  ldr r4, =0

  .Lend:

  .Ldiff = .Lend - .Lstart

  ldr r4, =.Ldiff



it works as expected.



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