Ignone SHF_INFO_LINK.

Some elf producers (dtrace) put this flag in relocation sections and
some (MC) don't. If we don't ignore the flag we end up with multiple
relocation sections poiting to the same section, which we don't
support.

llvm-svn: 288585

lld/ELF/InputSection.cpp

@@ -92,9 +92,10 @@ template <class ELFT>
 InputSectionBase<ELFT>::InputSectionBase(elf::ObjectFile<ELFT> *File,
                                          const Elf_Shdr *Hdr, StringRef Name,
                                          Kind SectionKind)
-    : InputSectionBase(File, Hdr->sh_flags, Hdr->sh_type, Hdr->sh_entsize,
-                       Hdr->sh_link, Hdr->sh_info, Hdr->sh_addralign,
-                       getSectionContents(File, Hdr), Name, SectionKind) {
+    : InputSectionBase(File, Hdr->sh_flags & ~SHF_INFO_LINK, Hdr->sh_type,
+                       Hdr->sh_entsize, Hdr->sh_link, Hdr->sh_info,
+                       Hdr->sh_addralign, getSectionContents(File, Hdr), Name,
+                       SectionKind) {
   this->Offset = Hdr->sh_offset;
 }
 

lld/test/ELF/Inputs/shf-info-link.test

@@ -0,0 +1,21 @@
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+  - Name:            .rela.text
+    Type:            SHT_RELA
+    Link:            .symtab
+    Info:            .text
+    Relocations:
+      - Offset:          0x0000000000000000
+        Symbol:          foo
+        Type:            R_X86_64_64
+Symbols:
+  Global:
+    - Name:            foo

lld/test/ELF/shf-info-link.test

@@ -0,0 +1,32 @@
+# RUN: yaml2obj %s -o %t.o
+# RUN: yaml2obj %S/Inputs/shf-info-link.test  -o %t2.o
+# RUN: ld.lld %t.o %t2.o -o %t3.o -r
+# RUN: llvm-readobj -s %t3.o | FileCheck %s
+
+# CHECK-NOT: Name: .rela.text
+# CHECK:     Name: .rela.text
+# CHECK-NOT: Name: .rela.text
+
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+  - Name:            .rela.text
+    Type:            SHT_RELA
+    Flags:           [ SHF_INFO_LINK ]
+    Link:            .symtab
+    Info:            .text
+    Relocations:
+      - Offset:          0x0000000000000000
+        Symbol:          foo
+        Type:            R_X86_64_64
+Symbols:
+  Global:
+    - Name:            foo