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With RISC-V being a relatively young toolchain, a lot of inconsistencies between different toolchains are to be found that differ in the target triple and the flags supported. This build system performs run-time tests to detect the toolchain and supported flags. With `BUILD_IN_DOCKER=1` issues arise, as this checks are performed outside of the docker container. However, the host may have no RISC-V toolchain installed or a different toolchain, so there is little reason in performing this detection then. Instead, a hard coded target triple and supported flags are provided when using `BUILD_IN_DOCKER=1`.