[clang][patch][FPEnv] Make initialization of C++ globals strictfp aware

@kpn pointed out that the global variable initialization functions didn't
have the "strictfp" metadata set correctly, and @rjmccall said that there
was buggy code in SetFPModel and StartFunction, this patch is to solve
those problems. When Sema creates a FunctionDecl, it sets the
FunctionDeclBits.UsesFPIntrin to "true" if the lexical FP settings
(i.e. a combination of command line options and #pragma float_control
settings) correspond to ConstrainedFP mode. That bit is used when CodeGen
starts codegen for a llvm function, and it translates into the
"strictfp" function attribute. See bugs.llvm.org/show_bug.cgi?id=44571

Reviewed By: Aaron Ballman

Differential Revision: https://reviews.llvm.org/D102343

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 5e8c4de..a88bf52 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -859,7 +859,8 @@ static void InsertOCLBuiltinDeclarationsFromTable(Sema &S, LookupResult &LR,
     for (const auto &FTy : FunctionList) {
       NewOpenCLBuiltin = FunctionDecl::Create(
           Context, Parent, Loc, Loc, II, FTy, /*TInfo=*/nullptr, SC_Extern,
-          false, FTy->isFunctionProtoType());
+          S.getCurFPFeatures().isFPConstrained(), false,
+          FTy->isFunctionProtoType());
       NewOpenCLBuiltin->setImplicit();
 
       // Create Decl objects for each parameter, adding them to the