[LLVMbugs] [Bug 4291] New: don't emit ".cpu generic" on arm linux

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4291

           Summary: don't emit ".cpu generic" on arm linux
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


The ".cpu" directive doesn't seem to be documented as being supported in
binutils as, but it works anyways (seemingly supporting the same syntax as the
-mcpu=... flag) which means that ".cpu generic" is illegal:

x.s: Assembler messages:
x.s:2: Error: unknown cpu `generic'

For examples of legal .cpu values, you could see
http://sourceware.org/binutils/docs/as/ARM-Options.html but specifying "arm7"
for example causes this:

x.s: Assembler messages:
x.s:25: Error: selected processor does not support `bx lr'

Just removing the .cpu line produces a binary that actually runs.


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