Fix a crash when casting _Complex and ignoring the results.
Performing a cast where the result is ignored caused Clang to crash when
performing codegen for the conversion:
_Complex int a;
void fn1() { (_Complex double) a; }
This patch addresses the crash by not trying to emit the scalar conversions,
causing it to be a noop. Fixes PR44624.
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index f7a4e9e..4c52786 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -431,8 +431,10 @@
// C99 6.3.1.6: When a value of complex type is converted to another
// complex type, both the real and imaginary parts follow the conversion
// rules for the corresponding real types.
- Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType, Loc);
- Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType, Loc);
+ if (Val.first)
+ Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType, Loc);
+ if (Val.second)
+ Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType, Loc);
return Val;
}