[llvm-bugs] [Bug 45364] New: x86 -fcf-protection -mcmodel=large is broken
via llvm-bugs
llvm-bugs at lists.llvm.org
Mon Mar 30 14:42:45 PDT 2020
https://bugs.llvm.org/show_bug.cgi?id=45364
Bug ID: 45364
Summary: x86 -fcf-protection -mcmodel=large is broken
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: efriedma at quicinc.com
CC: craig.topper at gmail.com, hjl.tools at gmail.com,
llvm-bugs at lists.llvm.org, llvm-dev at redking.me.uk,
spatel+llvm at rotateright.com, xiang1.zhang at intel.com
Testcase:
void ext();
__attribute((noinline)) static void a() { ext(); }
void b() { a(); }
Compile with "clang -O2 -mcmodel=large -fcf-protection". Note the indirect
call to "a", which does not have an endbr.
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