[cfe-dev] CanQualType for ssize_t

[Alexander Shaposhnikov via cfe-dev]

Hi,
I have a question regarding the right way to get CanQualType/QualType for
"ssize_t".

The class ASTContext
<https://clang.llvm.org/doxygen/classclang_1_1ASTContext.html#a7c89acd533ffea38c5011885d8d029e4>
 (https://clang.llvm.org/doxygen/ASTContext_8cpp_source.html#l04524)
has a number of methods: getIntMaxType, getUintMaxType, getSizeType etc but
if i am not mistaken it doesn't have the counterpart for "ssize_t".
After looking at the implementation of those methods i see that it's
missing in the class TargetInfo
<https://clang.llvm.org/doxygen/classclang_1_1TargetInfo.html> either.
https://clang.llvm.org/doxygen/include_2clang_2Basic_2TargetInfo_8h_source.html#l00228
.

Some context:

in PrintfSpecifier::getArgType (in ./lib/Analysis/PrintfFormatString.cpp)
there is a FIXME:

     case LengthModifier::AsSizeT:
         return ArgType(); // FIXME: ssize_t

as a result Clang doesn't analyze the format string "%zd" correctly
and doesn't warn on the following (broken) code:

    int main() {
      printf("%zd", 12.2);
      return 0;
    }

Kind regards,
Alexander Shaposhnikov
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