https://llvm.org/bugs/show_bug.cgi?id=26226
Bug ID: 26226
Summary: -fstack-protector fails to link on powerpc64le linux
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: unassignedb...@nondot.org
Reporter: timshe...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Example:
// clang++ -target powerpc64le-unknown-linux-gnu -fstack-protector a.cc
int main() {
char arr[2048];
arr[2048+15] = 0;
return 0;
}
Linker complains undefined reference to `__stack_chk_guard'.
In fact, glibc stores stack_guard not as a global/TLS variable, but a data
member in TCB:
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/powerpc/nptl/tls.h;h=0e889bc122c9bf91bae1adf43977e9e04c1e5595;hb=HEAD#l99
x86 suffered from the same issue, and then was fixed by:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20100705/103635.html
The fix specifies an address space (which finally turns into fs/gs access) and
hard code the offset to indicate the location of the stack guard.
How do we fix this? Do we use the same address space trick?
Thanks!
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