[LLVMbugs] [Bug 20793] New: Third field of llvm.global_ctors not used on ELF

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20793

            Bug ID: 20793
           Summary: Third field of llvm.global_ctors not used on ELF
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu, rnk at google.com
    Classification: Unclassified

This is just a reminder of a missing feature.

Given

-----------------------------------                                    
@v = weak_odr global i8 0
@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void
\
()*, i8* } { i32 65535, void ()* @f, i8* @v}]
define void @f() {
entry:
  ret void
}
--------------------------------------------

With x86_64-pc-win32 we produce

-----------------------------------------------
    .section    .bss,"bw",discard,v
    .globl    v                       # @v
v:
    .byte    0                       # 0x0

    .section    .CRT$XCU,"rd",associative,v
    .align    8
    .quad    f
------------------------------------------------

but with x86_64-pc-linux

we produce

-----------------------------------------------
    .section    .bss.v,"aGw", at nobits,v,comdat
    .weak    v
v:
    .byte    0                       # 0x0
    .size    v, 1

    .section    .ctors,"aw", at progbits
    .align    8
    .quad    f
-----------------------------------------------

We could put this .ctors section in the v comdat.

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