[Bug d/90136] New: [d] Merge UDAs between function prototype and definitions

[ibuclaw at gdcproject dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90136

            Bug ID: 90136
           Summary: [d] Merge UDAs between function prototype and
                    definitions
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

For two function declarations that have identical signatures (there's no
mismatched nothrow/pure/@nogc/...) any user defined attributes applied to one
should be merged with the other.

Given:

@("foo")
void bar(ref double[4]);

void bar(ref double[4] a)
{
    foreach (ref b; a)
        b += 42;
}


This is important for one use of the gcc.attribute module.

static if (GNU_ARM_EABI_Unwinder)
{
  @attribute("target", ("general-regs-only"))
  private _Unwind_Reason_Code __gdc_personality(_Unwind_Action actions,
                                              _Unwind_Exception_Class
exceptionClass,
                                              _Unwind_Exception* unwindHeader,
                                              _Unwind_Context* context);
}