https://llvm.org/bugs/show_bug.cgi?id=23104
Bug ID: 23104
Summary: Copy relocation against protected symbol doesn't work
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Protected data symbol means that it can't be preempted. It doesn't mean
its address won't be external. This is true for pointer to protected
function. With copy relocation, address of protected data defined in the
shared library may also be external. We only know that for sure at
run-time. On Linux/x86-64, with linker from binutils master branch:
[hjl@gnu-6 pr65248]$ cat bar.c
int a;
__attribute__((visibility("protected"))) int a;
void
bar ()
{
a = 30;
}
[hjl@gnu-6 pr65248]$ make
CC=/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang libbar.so
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -O3 -fpic -c -o
bar.o bar.c
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -shared -o libbar.so
bar.o
/usr/local/bin/ld: bar.o: relocation R_X86_64_PC32 against protected symbol `a'
can not be used when making a shared object
/usr/local/bin/ld: final link failed: Bad value
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)
make: *** [libbar.so] Error 1
[hjl@gnu-6 pr65248]$
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
