[Bug target/49950] New: GOT relocation for -fPIE is excessive

[jan.kratochvil at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49950

           Summary: GOT relocation for -fPIE is excessive
           Product: gcc
           Version: 4.4.7
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jan.kratochvil@redhat.com
            Target: x86_64-unknown-linux-gnu


FAIL: gcc (GCC) 4.4.7 20110802 (prerelease)
FAIL: gcc (GCC) 4.5.4 20110802 (prerelease)
FAIL: gcc (GCC) 4.6.2 20110802 (prerelease)
FAIL: gcc (GCC) 4.7.0 20110802 (experimental)

echo 'int i; int f (void) { return i; }' | gcc -c -o 20.o -Wall -fPIE -x c -
readelf -Wr 20.o
0000000000000007  0000000800000009 R_X86_64_GOTPCREL      0000000000000004 i -
4

none:  R_X86_64_PC32     is correct
-fPIE: R_X86_64_GOTPCREL is excessive - this Bug
-fPIC: R_X86_64_GOTPCREL is correct

Jakub:
the difference between -fPIE and -fPIC is that the former assumes that you
can't override its symbols
so if it sees some symbol defined in the current source file, it knows that it
will be the definition at runtime
for -shared libraries that is not true, other shared libraries defining the
same symbol can override it, so they need more runtime relocations