clang 17 upgrade: remaining 3C failing tests

[dtarditi]

With this PR, there are 6 failing 3C test cases:

  Clang :: 3C/3d-allocation.c
  Clang :: 3C/function_typedef.c
  Clang :: 3C/itype_nt_arr_cast.c
  Clang :: 3C/itype_undef.c
  Clang :: 3C/prototype_success1.c
  Clang :: 3C/prototype_success2.c
  Clang :: 3C/valist.c

I debugged 3C/prototype_success2.c, which is oddly compiled when you run the 3C\prototype_success1.c test. The 3C failure is due to trying to get a source location for a compiler-generated variable declaration. The test case that triggers the failures shows the problem:

_Ptr<int> foo(int *, char);

In the prototype declaration, only the types of the arguments are declared. The compiler generates a variable declaration. When 3C tries to fetch the source code location, an assert happens.

Here's a partial call stack. This is on Windows using the VS Studio debugger:

>	3c.exe!HandleAbort(int Sig) Line 415	C++
 	[External Code]	
 	3c.exe!clang::SourceManager::getFileIDLoaded(unsigned int SLocOffset) Line 868	C++
 	3c.exe!clang::SourceManager::getFileIDSlow(unsigned int SLocOffset) Line 779	C++
 	3c.exe!clang::SourceManager::getFileID(unsigned int SLocOffset) Line 1831	C++
 	3c.exe!clang::SourceManager::getFileID(clang::SourceLocation SpellingLoc) Line 1120	C++
 	3c.exe!clang::SourceManager::getExpansionLocSlowCase(clang::SourceLocation Loc) Line 946	C++
 	3c.exe!clang::SourceManager::getExpansionLoc(clang::SourceLocation Loc) Line 1172	C++
 	3c.exe!PersistentSourceLoc::mkPSL(clang::SourceRange SR, clang::SourceLocation SL, const clang::ASTContext & Context) Line 61	C++
 	3c.exe!PersistentSourceLoc::mkPSL(const clang::Decl * D, const clang::ASTContext & C) Line 26	C++
 	3c.exe!MappingVisitor::VisitDecl(clang::Decl * D) Line 18	C++
 	3c.exe!clang::RecursiveASTVisitor<MappingVisitor>::WalkUpFromDecl(clang::Decl * D) Line 440	C++
 	3c.exe!clang::RecursiveASTVisitor<MappingVisitor>::WalkUpFromNamedDecl(clang::NamedDecl * D) Line 107	C++

[souragc]

Hi David,

I cloned this repo's branch 17-init-main and tried running the 3C tests. I am only getting two tests which are failing. Can you post the commit on which you got the above results? Also, it looked like this repo is missing a change to the CMakeLists.txt from the 17-init-main branch of the archived fork. So I used the archive during my building. Please let me know if I should be building differently.