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rust: Respect HOSTCC when linking for host
Currently, rustc defaults to invoking `cc`, even if `HOSTCC` is defined, resulting in build failures in hermetic environments where `cc` does not exist. This includes both hostprogs and proc-macros. Since we are setting the linker to `HOSTCC`, we set the linker flavor to `gcc` explicitly. The linker-flavor selects both which linker to search for if the linker is unset, and which kind of linker flags to pass. Without this flag, `rustc` would attempt to determine which flags to pass based on the name of the binary passed as `HOSTCC`. `gcc` is the name of the linker-flavor used by `rustc` for all C compilers, including both `gcc` and `clang`. Signed-off-by: Matthew Maurer <[email protected]> Reviewed-by: Martin Rodriguez Reboredo <[email protected]> Tested-by: Alice Ryhl <[email protected]> Reviewed-by: Nick Desaulniers <[email protected]> Acked-by: Miguel Ojeda <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
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