84b1e59580
This patch modifies MLIR to LLVM IR lowering of the OpenMP dialect to take into consideration the contents of the `omp.target_triples` module attribute while generating code for `omp.target` operations. It adds the `OpenMPIRBuilderConfig::TargetTriples` field and initializes it using the `amendOperation` flow of the `OpenMPToLLVMIRTranslation` pass. Some changes are introduced into the `OpenMPIRBuilder` to allow passing the information about whether a target region is intended to be offloaded from outside. The result of this change is that offloading calls are only generated when the `--offload-arch` or `-fopenmp-targets` options are given to the compiler. Otherwise, only the host fallback code is generated. This fixes linker errors currently triggered by `flang-new` if a source file containing a `target` construct is compiled without any of the aforementioned options. Several unit tests impacted by these changes, which are intended to check host code generated for `omp.target` operations, are updated to contain the new attribute. Without it, no calls to `__tgt_target_kernel` and associated control flow operations are generated. Fixes #100209.
Flang Integration Tests
This directory can be used to add Integration tests involving multiple stages of the compiler (for eg. from Fortran to LLVM IR). It should not contain executable tests. We should only add tests here sparingly and only if there is no other way to test. Repeat this message in each test that is added to this directory and sub-directories.