[Bug ld/15025] New: --enable-initfini-array creates .init_array where no input has one

[rguenther at suse dot de]

http://sourceware.org/bugzilla/show_bug.cgi?id=15025

             Bug #: 15025
           Summary: --enable-initfini-array creates .init_array where no
                    input has one
           Product: binutils
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: address@hidden
        ReportedBy: address@hidden
    Classification: Unclassified


When --enable-initfini-array then the linker script looks like

  .init_array     :
  {
    KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*)
SORT_BY_INIT_PRIORITY(.ctors.*)))
    KEEP (*(.init_array))
    KEEP (*(EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o )
.ctors))
  }

which means .init_array is unconditionally generated even if it is not present
in any input file (but only .ctors are).  That's undesirable because it does
not preserve ordering in .ctors.

Testcase:

class X { public: X() {} };
X x;
int main(){}

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