[llvm-objcopy][MachO] Add support for min os version load commands

[alexander-shaposhnikov]

Summary

Add support for min os version load commands.

Test plan: make check-all

[smeenai]

LGTM ... seems like a trivial change that matches the existing handling of LC_VERSION_MIN_MACOSX (and adds test coverage as an added bonus).

[seiya]

LGTM too.

[alexander-shaposhnikov]

Committed: https://github.com/llvm/llvm-project/commit/074af2daf5f33b884088dc0200b1acb038bfcaec

llvm/test/tools/llvm-objcopy/MachO/Inputs/min_iphoneos_version_lc.yaml

+--- !mach-o
+FileHeader:
+  magic:           0xFEEDFACE
+  cputype:         0x0000000C
+  cpusubtype:      0x00000009
+  filetype:        0x00000001
+  ncmds:           1
+  sizeofcmds:      16
+  flags:           0x00002000
+LoadCommands:
+  - cmd:             LC_VERSION_MIN_IPHONEOS
+    cmdsize:         16
+    version:         327680
+    sdk:             0
+...

llvm/test/tools/llvm-objcopy/MachO/Inputs/min_macos_version_lc.yaml

+--- !mach-o
+FileHeader:
+  magic:           0xFEEDFACE
+  cputype:         0x0000000C
+  cpusubtype:      0x00000009
+  filetype:        0x00000001
+  ncmds:           1
+  sizeofcmds:      16
+  flags:           0x00002000
+LoadCommands:
+  - cmd:             LC_VERSION_MIN_MACOSX
+    cmdsize:         16
+    version:         327680
+    sdk:             0
+...

llvm/test/tools/llvm-objcopy/MachO/Inputs/min_tvos_version_lc.yaml

+--- !mach-o
+FileHeader:
+  magic:           0xFEEDFACE
+  cputype:         0x0000000C
+  cpusubtype:      0x00000009
+  filetype:        0x00000001
+  ncmds:           1
+  sizeofcmds:      16
+  flags:           0x00002000
+LoadCommands:
+  - cmd:             LC_VERSION_MIN_TVOS
+    cmdsize:         16
+    version:         327680
+    sdk:             0
+...

llvm/test/tools/llvm-objcopy/MachO/Inputs/min_watchos_version_lc.yaml

+--- !mach-o
+FileHeader:
+  magic:           0xFEEDFACE
+  cputype:         0x0000000C
+  cpusubtype:      0x00000009
+  filetype:        0x00000001
+  ncmds:           1
+  sizeofcmds:      16
+  flags:           0x00002000
+LoadCommands:
+  - cmd:             LC_VERSION_MIN_WATCHOS
+    cmdsize:         16
+    version:         327680
+    sdk:             0
+...

llvm/test/tools/llvm-objcopy/MachO/min-version-load-commands.test

+## This test verifies that llvm-objcopy correctly handles min os version load commands.
+## We use separate input files since one binary is not allowed to contain more than one
+## load command of this type (LC_VERSION_MIN_IPHONEOS, LC_VERSION_MIN_MACOSX,
+## LC_VERSION_MIN_TVOS, LC_VERSION_MIN_WATCHOS).
+
+# RUN: yaml2obj %p/Inputs/min_iphoneos_version_lc.yaml > %t.iphoneos
+# RUN: llvm-objcopy %t.iphoneos %t.iphoneos.copy
+# RUN: cmp %t.iphoneos %t.iphoneos.copy
+
+# RUN: yaml2obj %p/Inputs/min_macos_version_lc.yaml > %t.macos
+# RUN: llvm-objcopy %t.macos %t.macos.copy
+# RUN: cmp %t.macos %t.macos.copy
+
+# RUN: yaml2obj %p/Inputs/min_tvos_version_lc.yaml > %t.tvos
+# RUN: llvm-objcopy %t.tvos %t.tvos.copy
+# RUN: cmp %t.tvos %t.tvos.copy
+
+# RUN: yaml2obj %p/Inputs/min_watchos_version_lc.yaml > %t.watchos
+# RUN: llvm-objcopy %t.watchos %t.watchos.copy
+# RUN: cmp %t.watchos %t.watchos.copy

llvm/tools/llvm-objcopy/MachO/MachOLayoutBuilder.cpp

case MachO::LC_DYLD_INFO_ONLY:
       MLC.dyld_info_command_data.export_size = O.Exports.Trie.size();
       break;
     case MachO::LC_LOAD_DYLINKER:
     case MachO::LC_MAIN:
     case MachO::LC_RPATH:
     case MachO::LC_SEGMENT:
     case MachO::LC_SEGMENT_64:
     case MachO::LC_VERSION_MIN_MACOSX:
+    case MachO::LC_VERSION_MIN_IPHONEOS:
+    case MachO::LC_VERSION_MIN_TVOS:
+    case MachO::LC_VERSION_MIN_WATCHOS:
     case MachO::LC_BUILD_VERSION:
     case MachO::LC_ID_DYLIB:
     case MachO::LC_LOAD_DYLIB:
     case MachO::LC_UUID:
     case MachO::LC_SOURCE_VERSION:
       // Nothing to update.
       break;
     default: