http://llvm.org/bugs/show_bug.cgi?id=4533
Summary: relocation problem with shared libraries on x86-64
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
The problem is that the address of a function shows up differently in two
different translation units. One TU is compiled to a shared library with -fPIC,
the other has neither. This works with GCC but not LLVM:
$ g++ -O2 -fPIC x.cc -shared -o x.so
$ g++ -O2 y.cc -o y x.so
$ ./y
y: 0x400570
x: 0x400570
$ llvm-g++ -O2 -fPIC x.cc -shared -o x.so
$ llvm-g++ -O2 y.cc -o y x.so
$ ./y
y: 0x4004c8
x: 0x7f07903b2240
The testcase is two very small files:
x.cc:
#include <cstdio>
void trouble() {}
void func() {
printf("x: %p\n", trouble);
}
y.cc:
#include <cstdio>
void trouble();
extern void func();
int main(void) {
printf("y: %p\n", trouble);
func();
}
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