[Bug ld/3283] New: x86-64 linker ignores relocation overflow

[hjl at lucon dot org]

bash-3.1$ cat foo.c
extern char x __attribute__((weak, visibility("hidden")));
void *_start(void) { return &x; }
bash-3.1$ make
gcc -fPIC   -c -o foo.o foo.c
ld -Ttext 100000000 -o foo foo.o
objdump -dr foo.o

foo.o:     file format elf64-x86-64

Disassembly of section .text:

0000000000000000 <_start>:
   0:   55                      push   %rbp
   1:   48 89 e5                mov    %rsp,%rbp
   4:   48 8d 05 00 00 00 00    lea    0(%rip),%rax        # b <_start+0xb>
                        7: R_X86_64_PC32        x+0xfffffffffffffffc
   b:   c9                      leaveq
   c:   c3                      retq
objdump -d foo

foo:     file format elf64-x86-64

Disassembly of section .text:

0000000100000000 <_start>:
   100000000:   55                      push   %rbp
   100000001:   48 89 e5                mov    %rsp,%rbp
   100000004:   48 8d 05 f5 ff ff ff    lea    -11(%rip),%rax        # 100000000
<_start>
   10000000b:   c9                      leaveq
   10000000c:   c3                      retq
bash-3.1$

Linker ignores relocation overflow. As the result, &x is no longer 0. This
change was introduced by

http://sourceware.org/ml/binutils/2004-06/msg00199.html

-- 
           Summary: x86-64 linker ignores relocation overflow
           Product: binutils
           Version: 2.18 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: hjl at lucon dot org
                CC: amodra at bigpond dot net dot au,bug-binutils at gnu dot
                    org


http://sourceware.org/bugzilla/show_bug.cgi?id=3283

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