[Bug gas/18561] New: sh assembler wrongly constant-folds address expressions containing weak symbols

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=18561

            Bug ID: 18561
           Summary: sh assembler wrongly constant-folds address
                    expressions containing weak symbols
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: bugdal at aerifal dot cx
  Target Milestone: ---

Minimal test case:

.global a
.global b
.weak a
.align 2
a: .long 0
b: .long a-.

The output should contain a R_SH_REL32 relocation, but instead it contains a
constant. This bug affects gcc, which produces such expressions for intra-DSO
PIC function calls; if the callee has a local weak definition; strong
definitions will fail to override at link time.

This could be fixed on the GCC side by having gcc explicitly produce @PCREL
references rather than using arithmetic with ., but either way I think this is
a serious gas bug that needs to be fixed.

-- 
You are receiving this mail because:
You are on the CC list for the bug.