## Stub dylibs differ from "real" dylibs in that they lack any content in their
## sections. What they do have are export tries and symbol tables, which means
## we can still link against them. I (jezng) am unclear how to properly create
## these stub dylibs; XCode 11.3's `lipo` is able to create stub dylibs, but
## those lack LC_ID_DYLIB load commands and are considered invalid by most
## tooling. Newer versions of `lipo` aren't able to create stub dylibs at all.
## However, recent SDKs in XCode still come with valid stub dylibs, so it still
## seems worthwhile to support them. The YAML in this test was generated by
## taking a non-stub dylib and editing the appropriate fields.

# REQUIRES: x86
# RUN: rm -rf %t; split-file %s %t
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/test.s -o %t/test.o
# RUN: yaml2obj %t/fat.dylib.yaml > %t/fat.dylib
# RUN: %lld -lSystem %t/test.o %t/fat.dylib -o %t/test
# RUN: llvm-objdump --macho --lazy-bind %t/test | FileCheck %s
# CHECK: __DATA   __la_symbol_ptr    0x100002000 foo  _foo

#--- test.s
.globl _main
_main:
  callq _foo
  ret

#--- fat.dylib.yaml
--- !fat-mach-o
FatHeader:
  magic:           0xCAFEBABE
  nfat_arch:       1
FatArchs:
  - cputype:         0x01000007
    cpusubtype:      0x00000003
    offset:          0x0000000000001000
    size:            16432
    align:           12
Slices:
  - !mach-o
    FileHeader:
      magic:           0xFEEDFACF
      cputype:         0x01000007
      cpusubtype:      0x00000003
      filetype:        0x00000009
      ncmds:           5
      sizeofcmds:      568
      flags:           0x00100085
      reserved:        0x00000000
    LoadCommands:
      - cmd:             LC_SEGMENT_64
        cmdsize:         232
        segname:         __TEXT
        vmaddr:          0
        vmsize:          16384
        fileoff:         0
        filesize:        16384
        maxprot:         5
        initprot:        5
        nsects:          1
        flags:           0
        Sections:
          - sectname:        __text
            segname:         __TEXT
            addr:            0x0000000000000000
            size:            0
            offset:          0x00003FB7
            align:           0
            reloff:          0x00000000
            nreloc:          0
            flags:           0x80000400
            reserved1:       0x00000000
            reserved2:       0x00000000
            reserved3:       0x00000000
            content:         ''
      - cmd:             LC_SEGMENT_64
        cmdsize:         72
        segname:         __LINKEDIT
        vmaddr:          16384
        vmsize:          16384
        fileoff:         16384
        filesize:        48
        maxprot:         1
        initprot:        1
        nsects:          0
        flags:           0
      - cmd:             LC_ID_DYLIB
        cmdsize:         40
        dylib:
          name:            24
          timestamp:       1
          current_version: 0
          compatibility_version: 0
        Content:         foo.dylib
        ZeroPadBytes:    7
      - cmd:             LC_DYLD_INFO_ONLY
        cmdsize:         48
        rebase_off:      0
        rebase_size:     0
        bind_off:        0
        bind_size:       0
        weak_bind_off:   0
        weak_bind_size:  0
        lazy_bind_off:   0
        lazy_bind_size:  0
        export_off:      16384
        export_size:     16
      - cmd:             LC_SYMTAB
        cmdsize:         24
        symoff:          16408
        nsyms:           1
        stroff:          16424
        strsize:         8
    LinkEditData:
      ExportTrie:
        TerminalSize:    0
        NodeOffset:      0
        Name:            ''
        Flags:           0x0000000000000000
        Address:         0x0000000000000000
        Other:           0x0000000000000000
        ImportName:      ''
        Children:
          - TerminalSize:    3
            NodeOffset:      8
            Name:            _foo
            Flags:           0x0000000000000000
            Address:         0x0000000000003FB7
            Other:           0x0000000000000000
            ImportName:      ''
      NameList:
        - n_strx:          2
          n_type:          0x0F
          n_sect:          1
          n_desc:          0
          n_value:         16311
      StringTable:
        - ' '
        - _foo
        - ''
...