X86-Windows: Emit an undefined global __fltused symbol when targeting Windows
if any floating point arguments are passed to an external function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116665 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86AsmPrinter.cpp b/lib/Target/X86/X86AsmPrinter.cpp
index 85441b1..c4fd729 100644
--- a/lib/Target/X86/X86AsmPrinter.cpp
+++ b/lib/Target/X86/X86AsmPrinter.cpp
@@ -580,6 +580,13 @@
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
}
+ if (Subtarget->isTargetWindows()
+ && !Subtarget->isTargetCygMing()
+ && MMI->callsExternalFunctionWithFloatingPointArguments()) {
+ MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("__fltused"));
+ OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
+ }
+
if (Subtarget->isTargetCOFF()) {
X86COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<X86COFFMachineModuleInfo>();