enable llvm when gcc is linked to clang

[howjmay]

For unknown reason, gdb can't be compiled, since libgmp linking error. This bypass gdb compilation as a workaround.

This solved the issue presented in #102

closes #104

[sbeamer]

Are you sure about the meaning of this flag? Looking at the source, it seems to turn on building llvm, and is independent of the compiler used (https://github.com/riscv-collab/riscv-gnu-toolchain/blob/6e7190e8c95e09d541e69f6f6e39163f808570d5/configure#L1342).

Macs for quite a few years have had gcc linked to clang, and making gcc be actually gcc takes deliberate effort. Most users of this repo (including myself who builds the bottles), uses the default Apple compiler which is clang linked as gcc.

[howjmay]

I am using Mac M1 Version 13.2.1. On my machine gcc is linked to clang. And I met a errors I reported. I solved the errors by using gcc instead of clang. To be honest, I don't know the exact reason that why other people can use the original formula to install.

[didikamalova]

I'm hitting the same issue in #102. Running on a macOS M1 14.0.

[howjmay]

I'm hitting the same issue in #102. Running on a macOS M1 14.0.

Hey @didikamalova. Did you solve it by my branch?

[didikamalova]

I'm hitting the same issue in #102. Running on a macOS M1 14.0.

Hey @didikamalova. Did you solve it by my branch?

No, it didn't work for me

[howjmay]

I'm hitting the same issue in #102. Running on a macOS M1 14.0.

Hey @didikamalova. Did you solve it by my branch?

No, it didn't work for me

@didikamalova I retried again, now I can't build it too😭

[howjmay]

@didikamalova I think now it works