When modules are disabled, there's no loaded module for these import
decls to point at. This results in crashes when there are modulemap
files but no -fmodules flag (this configuration is used for layering
check violations).
This patch makes sure import declarations are introduced only when
modules are enabled, which makes this case similar to textual headers
(no import decls are created for #include of textual headers from a
modulemap).
Differential Revision: https://reviews.llvm.org/D152274
These constructs are only applicable to a debugger capable of loading a
Clang AST, so omit them for brevity when not doing so.
We could potentially propagate more of CodeGenOptions through the
ObjectFilePCGContainerOperations for consistency (so the next person who
adds some CodeGenOpts feature that tweaks debug info output doesn't get
caught by this), so I'm open to objections/alternatives there, but went
with this for now.
Tested just a couple of basic cases (one direct, one indirect (through
the ObjectFilePCHContainerOperations) & fixed up other cases to pass the
-debugger-tuning flag as appropriate.
llvm-svn: 268460
