https://bugs.llvm.org/show_bug.cgi?id=35463
Bug ID: 35463
Summary: X86: Stack probe symbol has wrong linkage while
compiling a shared object
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Target Description Classes
Assignee: unassignedb...@nondot.org
Reporter: ales.hraba...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 19485
--> https://bugs.llvm.org/attachment.cgi?id=19485&action=edit
Nasty hack that fixes the issue for us
We build ELF objects on Windows. Everything seemed to be working fine until we
compiled some code that uses dynamic stack allocation, and tried to link it
into a shared library (executable linking works fine). Here is a minimal
example that produces the error we observed:
// minimal example -- commands //
clang++ --target=x86_64-pc-windows-elf -c foo.cpp
ld.lld -shared foo.o -o foo
// minimal example -- foo.cpp //
int foo(int x) {
void *p = __builtin_alloca( x );
return (int)p;
}
// minimal example -- lld error //
D:\build\llvm-install-release\bin\ld.lld.exe: error: can't create dynamic
relocation R_X86_64_PC32 against symbol: __chkstk in readonly segment;
recompile object files with -fPIC
>>> defined in foo.o
>>> referenced by foo.cpp
>>> foo.o:(foo(int))
We have tracked the bug to X86FrameLowering.cpp. Attached is a small, nasty
hack that fixes the problem for us. It is probably not a good solution, but the
library links now.
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