Don't warn about -Wshorten-64-to-32 in unreachable code. Fixes <rdar://problem/10759934>. Apparently this is a common idiom in Linux (among other places).
llvm-svn: 149359
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index cd9d071..b02e5b5 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -3693,15 +3693,24 @@
/// Diagnose an implicit cast; purely a helper for CheckImplicitConversion.
static void DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T,
- SourceLocation CContext, unsigned diag) {
+ SourceLocation CContext, unsigned diag,
+ bool pruneControlFlow = false) {
+ if (pruneControlFlow) {
+ S.DiagRuntimeBehavior(E->getExprLoc(), E,
+ S.PDiag(diag)
+ << SourceType << T << E->getSourceRange()
+ << SourceRange(CContext));
+ return;
+ }
S.Diag(E->getExprLoc(), diag)
<< SourceType << T << E->getSourceRange() << SourceRange(CContext);
}
/// Diagnose an implicit cast; purely a helper for CheckImplicitConversion.
static void DiagnoseImpCast(Sema &S, Expr *E, QualType T,
- SourceLocation CContext, unsigned diag) {
- DiagnoseImpCast(S, E, E->getType(), T, CContext, diag);
+ SourceLocation CContext, unsigned diag,
+ bool pruneControlFlow = false) {
+ DiagnoseImpCast(S, E, E->getType(), T, CContext, diag, pruneControlFlow);
}
/// Diagnose an implicit cast from a literal expression. Does not warn when the
@@ -3907,7 +3916,8 @@
return;
if (SourceRange.Width == 64 && TargetRange.Width == 32)
- return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32);
+ return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32,
+ /* pruneControlFlow */ true);
return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision);
}