Commits on Oct 29, 2021

1. [flang][driver] Add support for -emit-obj in the frontend driver …

   This patch implements the `EmitObjAction` frontend action. The
   `CodeGenAction` is extended to contain an instance of `llvm::LLVMCtx`
   and `llvm::Module`. These variables are unlikely to be needed in other,
   non-code-gen actions (or in `CompilerInstance` or `CompilerInvocation`),
   so these should be the right location. Also, a member method for
   generating LLVM IR is added (see `GenerateLLVMIR`).
   
   The target triple is hard-coded as `native`, i.e. no cross-compilation
   is supported at this stage.
   
   `tripleName` in FirContext.cpp is updated from `fir.triple` to
   `llvm.target_triple`. The former was effectively ignored. The latter is
   used when lowering from the LLVM dialect in MLIR to LLVM IR (i.e. it's
   embedded in the generated LLVM IR module). The driver can then re-use
   that when configuring the backend. With this change, the LLVM IR files
   generated by e.g. `tco` will from now on contain the correct target triple.
   
   The code-gen.f90 test is replaced with code-gen-x86.f90 and
   code-gen-aarch64.f90. As these tests are arch specific (they check the
   generated assembly), support for `!REQUIRES: <arch>-registered-target`
   was added in LIT. The current approach is a bit fragile and will cause
   problems if multiple targets are available (e.g. X86 and AArch64).
   That's because `!REQUIRES: X86-registered-target` will be satisfied even
   on AArch64 targets if the X86 backend is enabled (through e.g.
   `LLVM_ENABLE_TARGETS`). However, the test could fail as currently
   `flang-new -fc1 -emit-obj` always generates code for the host
   architecture. This can be fixed by adding support for `-target`.

   

   banach-space committed Oct 29, 2021
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