https://llvm.org/bugs/show_bug.cgi?id=31530
Bug ID: 31530
Summary: UINT16_TYPE and INT16_TYPE are defined as short
instead of int for AVR
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
UINT16_TYPE and INT16_TYPE are implicitly defined by the preprocessor
to the short type, rather than int. While shorts and ints are both
16 bits wide on the avr, gcc picks ints to represent 16 bits wherever
possible, and picking short can cause issues with C++ name mangling
(see https://reviews.llvm.org/D27123#615854). Therefore, clang should
define the two types to short.
Clang's lib/Frontend/InitPreprocessor.cpp::DefineExactWidthIntType does not
use TargetInfo::getIntTypeByWidth. Instead,
InitializePredefinedMacros calls
the function with the specific type (SignedShort/UnsignedShort), because
getShortWidth() > getCharWidth(), but getIntWidth() ==
getShortWidth().
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