[clang][Darwin] Remove legacy framework search path logic in the frontend (#138234)

Move the Darwin framework search path logic from
InitHeaderSearch::AddDefaultIncludePaths to
DarwinClang::AddClangSystemIncludeArgs. Add a new -internal-iframework
cc1 argument to support the tool chain adding these paths.
Now that the tool chain is adding search paths via cc1 flag, they're
only added if they exist, so the Preprocessor/cuda-macos-includes.cu
test is no longer relevant.
Change Driver/driverkit-path.c and Driver/darwin-subframeworks.c to do
-### style testing similar to the darwin-header-search and
darwin-embedded-search-paths tests. Rename darwin-subframeworks.c to
darwin-framework-search-paths.c and have it test all framework search
paths, not just SubFrameworks.
Add a unit test to validate that the myriad of search path flags result
in the expected search path list.

Fixes https://github.com/llvm/llvm-project/issues/75638

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index a0b8bbf..3945129 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -3373,6 +3373,8 @@ static void GenerateHeaderSearchArgs(const HeaderSearchOptions &Opts,
                            : OPT_internal_externc_isystem;
     GenerateArg(Consumer, Opt, It->Path);
   }
+  for (; It < End && Matches(*It, {frontend::System}, true, true); ++It)
+    GenerateArg(Consumer, OPT_internal_iframework, It->Path);
 
   assert(It == End && "Unhandled HeaderSearchOption::Entry.");
 
@@ -3505,6 +3507,8 @@ static bool ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
       Group = frontend::ExternCSystem;
     Opts.AddPath(A->getValue(), Group, false, true);
   }
+  for (const auto *A : Args.filtered(OPT_internal_iframework))
+    Opts.AddPath(A->getValue(), frontend::System, true, true);
 
   // Add the path prefixes which are implicitly treated as being system headers.
   for (const auto *A :