Reland [ELF] Loose a condition for relocation with a symbol

This patch was not the reason of the buildbot failure.

Deleted code was introduced as a work around for a bug in the gold linker
(http://sourceware.org/PR16794). Test case that was given as a reason for
this part of code, the one on previous link, now works for the gold.
This condition is too strict and when a code is compiled with debug info
it forces generation of numerous relocations with symbol for architectures
that do not have relocation addend.

Reviewers: arsenm, espindola

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D64327

llvm-svn: 366686

Author: Nikola Prica

llvm/lib/MC/ELFObjectWriter.cpp

@@ -1396,11 +1396,6 @@ bool ELFObjectWriter::shouldRelocateWithSymbol(const MCAssembler &Asm,
     if (Flags & ELF::SHF_MERGE) {
       if (C != 0)
         return true;
-
-      // It looks like gold has a bug (http://sourceware.org/PR16794) and can
-      // only handle section relocations to mergeable sections if using RELA.
-      if (!hasRelocationAddend())
-        return true;
     }
 
     // Most TLS relocations use a got, so they need the symbol. Even those that

llvm/test/MC/ELF/basic-elf-32.s

@@ -46,9 +46,9 @@ main:                                   # @main
 
 // CHECK: Relocations [
 // CHECK:   Section {{.*}} .rel.text {
-// CHECK:     0x6  R_386_32   .L.str1
+// CHECK:     0x6  R_386_32   .rodata.str1.1 0x0
 // CHECK:     0xB  R_386_PC32 puts
-// CHECK:     0x12 R_386_32   .L.str2
+// CHECK:     0x12 R_386_32   .rodata.str1.1 0x0
 // CHECK:     0x17 R_386_PC32 puts
 // CHECK:   }
 // CHECK: ]

llvm/test/MC/ELF/compression.s

@@ -38,7 +38,7 @@
 
 // In x86 32 bit named symbols are used for temporary symbols in merge
 // sections, so make sure we handle symbols inside compressed sections
-// 386-SYMBOLS-GNU: Name: .Linfo_string0
+// 386-SYMBOLS-GNU: Name: .zdebug_str
 // 386-SYMBOLS-GNU-NOT: }
 // 386-SYMBOLS-GNU: Section: .zdebug_str
 
@@ -73,7 +73,7 @@
 // ZLIB-STYLE-FLAGS32-NEXT: AddressAlignment: 4
 // ZLIB-STYLE-FLAGS64-NEXT: AddressAlignment: 8
 
-// 386-SYMBOLS-ZLIB: Name: .Linfo_string0
+// 386-SYMBOLS-ZLIB: Name: .debug_str
 // 386-SYMBOLS-ZLIB-NOT: }
 // 386-SYMBOLS-ZLIB: Section: .debug_str
 

llvm/test/MC/ELF/relocation-386.s

@@ -8,7 +8,7 @@
 // I386: Format: ELF32-i386
 // CHECK:      Relocations [
 // CHECK-NEXT:   Section {{.*}} .rel.text {
-// CHECK-NEXT:     0x2          R_386_GOTOFF     .Lfoo 0x0
+// CHECK-NEXT:     0x2          R_386_GOTOFF     .rodata.str1.16 0x0
 // CHECK-NEXT:     0x{{[^ ]+}}  R_386_PLT32      bar2 0x0
 // CHECK-NEXT:     0x{{[^ ]+}}  R_386_GOTPC      _GLOBAL_OFFSET_TABLE_ 0x0
 // Relocation 3 (bar3@GOTOFF) is done with symbol 7 (bss)

llvm/test/MC/Mips/elf-relsym.s

@@ -4,16 +4,10 @@
 
 // CHECK: Symbols [
 // CHECK:   Symbol {
-// CHECK:     Name: $.str
+// CHECK:     Name: .rodata.cst8
 // CHECK:   }
 // CHECK:   Symbol {
-// CHECK:     Name: $.str1
-// CHECK:   }
-// CHECK:   Symbol {
-// CHECK:     Name: $CPI0_0
-// CHECK:   }
-// CHECK:   Symbol {
-// CHECK:     Name: $CPI0_1
+// CHECK:     Name: .rodata.str1.1
 // CHECK:   }
 // CHECK: ]
 

llvm/test/MC/Mips/xgot.s

@@ -10,8 +10,8 @@
 // CHECK:   0x1C R_MIPS_GOT_LO16 ext_1
 // CHECK:   0x24 R_MIPS_CALL_HI16 printf
 // CHECK:   0x30 R_MIPS_CALL_LO16 printf
-// CHECK:   0x2C R_MIPS_GOT16 $.str
-// CHECK:   0x38 R_MIPS_LO16 $.str
+// CHECK:   0x2C R_MIPS_GOT16 .rodata.str1.1 0x0
+// CHECK:   0x38 R_MIPS_LO16 .rodata.str1.1 0x0
 // CHECK: ]
 
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