[PATCH] D68407: [WIP][RISCV] Use compiler-rt if no GCC installation detected

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

In D68407#1744486 <https://reviews.llvm.org/D68407#1744486>, @leonardchan wrote:

> Hi. I think this patch is causing some test failures for us:


This is breaking us too, in the same way. The "problem" is that this makes the riscv64 target use the compiler-rt crtbegin / crtend files instead of the libgcc ones when configured with `-DCLANG_DEFAULT_RTLIB=compiler-rt`. That's probably the right behavior, but someone should check, and additional tests need to be updated to match. (It's not obvious how to even test this change in the presence of `CLANG_DEFAULT_RTLIB`...)

The following tests fail in the `-DCLANG_DEFAULT_RTLIB=compiler-rt` build configuration:

- `test/Driver/riscv32-toolchain.c`
- `test/Driver/riscv32-toolchain-extra.c`
- `test/Driver/riscv64-toolchain.c`
- `test/Driver/riscv64-toolchain-extra.c`

Reverted in aeaddf9 <https://reviews.llvm.org/rGaeaddf926a74814aa4f33050cfc12b19f419f1b0> to unbreak things for now.


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