In particular, while LLVM lld supports -L for linker scripts imported
with the `INCLUDE` command, GNU ld does not seem to support this.
This is a prerequisite for supporting the HiFive1 board in the TinyGo
Playground.
On Debian, all LLVM commands have a version suffix (clang-8, ld.lld-8,
wasm-ld-8, etc.). However. Most other distributions only provide a
version prefix for Clang and not for all the other commands.
This commit fixes the issue by trying the command with the version
suffix first and falling back to one without if needed.
This commit adds the TinyGo root directory (`TINYGOROOT`) to the linker
script `-L` search path, so that linker scripts can be found when
running `tinygo` outside of the TinyGo root.
This was already working before when using an external linker by setting
the working directory, but this is not possible when using the internal
linker. However, by adding the root directory to the linker search path
(`-L`), it can now find these linker scripts.
fixes#265
When building statically against LLVM, LLD is also included now. When
included, the built in wasm-ld will automatically be used instead of the
external command.
There is also support for linking ELF files but because lld does not
fully support armv6m this is not yet enabled (it produces a warning).
