COFF: Ensure that objects produced by LLVM link with /safeseh
Summary:
We indicate that the object files are safe by emitting a @feat.00
absolute address symbol. The address is presumably interpreted as a
bitfield of features that the compiler would like to enable. Bit 0 is
documented in the PE COFF spec to opt in to "registered SEH", which is
what /safeseh enables.
LLVM's object files are safe by default because LLVM doesn't know how to
produce SEH handlers.
Reviewers: Bigcheese
CC: llvm-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D1691
llvm-svn: 190898
diff --git a/llvm/test/CodeGen/X86/coff-feat00.ll b/llvm/test/CodeGen/X86/coff-feat00.ll
new file mode 100644
index 0000000..1dcd427
--- /dev/null
+++ b/llvm/test/CodeGen/X86/coff-feat00.ll
@@ -0,0 +1,7 @@
+; RUN: llc -O0 -mtriple=i386-pc-win32 -filetype=asm -o - %s | FileCheck %s
+
+define i32 @foo() {
+ ret i32 0
+}
+
+; CHECK: @feat.00 = 1