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Merging r213665:

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r213665 | tnorthover | 2014-07-22 08:47:09 -0700 (Tue, 22 Jul 2014) | 11 lines

X86: drop relocations on __eh_frame sections globally.

Without this, we produce non-extern relocations when targeting older OS X
versions that ld64 can't cope with in the particular context of __eh_frame
sections (who'd want generic relocation-processing anyway?).

This means that an updated linker (ld64 from Xcode 3.2.6 or later) may be
needed when targeting such platforms with a modern version of LLVM, but this is
probably the case anyway and a reasonable requirement.

PR20212, rdar://problem/17544795
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@214689 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2014-08-04 04:29:47 +00:00
parent 92a10767eb
commit 7f154753ce
2 changed files with 7 additions and 22 deletions
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9
lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
View File

@ -72,11 +72,10 @@ X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
if (T.isMacOSX() && T.isMacOSXVersionLT(10, 6))
HasWeakDefCanBeHiddenDirective = false;
// FIXME: this should not depend on the target OS version, but on the ld64
// version in use. From at least >= ld64-97.17 (Xcode 3.2.6) the abs-ified
// FDE relocs may be used. We also use them for the ios simulator.
DwarfFDESymbolsUseAbsDiff = (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
|| T.isiOS();
// Assume ld64 is new enough that the abs-ified FDE relocs may be used
// (actually, must, since otherwise the non-extern relocations we produce
// overwhelm ld64's tiny little mind and it fails).
DwarfFDESymbolsUseAbsDiff = true;
UseIntegratedAssembler = true;
}

20
test/MC/MachO/eh-frame-reloc.s
View File

@ -1,10 +1,10 @@
// RUN: llvm-mc < %s -triple=x86_64-apple-macosx10.7 -filetype=obj | llvm-readobj -r | FileCheck %s
// RUN: llvm-mc < %s -triple=x86_64-apple-macosx10.6 -filetype=obj | llvm-readobj -r | FileCheck %s
// RUN: llvm-mc < %s -triple=x86_64-apple-ios7.0.0 -filetype=obj | llvm-readobj -r | FileCheck %s
// RUN: llvm-mc < %s -triple=x86_64-apple-macosx10.5 -filetype=obj | llvm-readobj -r | FileCheck --check-prefix=OLD64 %s
// RUN: llvm-mc < %s -triple=x86_64-apple-macosx10.5 -filetype=obj | llvm-readobj -r | FileCheck %s
// RUN: llvm-mc < %s -triple=i686-apple-macosx10.6 -filetype=obj | llvm-readobj -r | FileCheck %s
// RUN: llvm-mc < %s -triple=i686-apple-macosx10.5 -filetype=obj | llvm-readobj -r | FileCheck --check-prefix=OLD32 %s
// RUN: llvm-mc < %s -triple=i686-apple-macosx10.4 -filetype=obj | llvm-readobj -r | FileCheck --check-prefix=OLD32 %s
// RUN: llvm-mc < %s -triple=i686-apple-macosx10.5 -filetype=obj | llvm-readobj -r | FileCheck %s
// RUN: llvm-mc < %s -triple=i686-apple-macosx10.4 -filetype=obj | llvm-readobj -r | FileCheck %s
.globl _bar
.align 4, 0x90
@ -14,17 +14,3 @@ _bar:
// CHECK: Relocations [
// CHECK-NEXT: ]
// OLD32: Relocations [
// OLD32-NEXT: Section __eh_frame {
// OLD32-NEXT: 0x20 0 2 n/a GENERIC_RELOC_LOCAL_SECTDIFF 1 0x0
// OLD32-NEXT: 0x0 0 2 n/a GENERIC_RELOC_PAIR 1 0x20
// OLD32-NEXT: }
// OLD32-NEXT: ]
// OLD64: Relocations [
// OLD64-NEXT: Section __eh_frame {
// OLD64-NEXT: 0x20 0 3 0 X86_64_RELOC_SUBTRACTOR 0
// OLD64-NEXT: 0x20 0 3 1 X86_64_RELOC_UNSIGNED 0 _bar
// OLD64-NEXT: }
// OLD64-NEXT: ]