Cannot use $ORIGIN in rpath with configure_make_variant

because rules_foreign_cc relies on a build_script.sh to wrap all the linker commands to building binaries, any path that is added as a linker argument with $ORIGIN in the rpath will fail at build time.

build_script.sh will see $ORIGIN and attempt to resolve the variable within the context of the bash script rather than piping the $ORIGIN string through to the linker.

As a workaround, I am setting the environment variable
env = {
"ORIGIN": "\\$$\\$$ORIGIN",
},

in order to have rules_foreign_cc build_script.sh resolve $ORIGIN to \$\$ORIGIN so that the makefile will see $$ORIGIN which will be treated as a literal.

It would be much much much preferred if rules_foreign_cc could support an rpath with $ORIGIN embedded natively, without end user need for work arounds.

Start by inspecting build_script.sh and the configure_make_variant entry point, then reproduce a build with an rpath containing $ORIGIN. Trace how the shell wrapper handles the linker argument; done means the literal $ORIGIN reaches the linker without requiring the reported environment-variable workaround.

Written by the indexing model from the issue text.