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For linking static libraries, rustc will use whatever `cc` it finds (or the equivalent on Windows). For our purposes, however, `cc` is not what we use to link and we may have additional options we would like to pass to the linker. To do this, we need to tell Cargo about our alternate linker (currently only used for target compilations, on the theory that the host compiler rustc finds is probably good enough) and we also need to pass our linker options into the process. We do this with environment variables, which is not a great solution, but works surprisingly well. This alternate linker is disabled for ASan builds due to peculiar crashes when running Rust build scripts and for Windows, because we don't do any interesting cross-compiling there.
21 lines
900 B
Bash
Executable File
21 lines
900 B
Bash
Executable File
#!/bin/sh
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# If you want to use a custom linker with Cargo, Cargo requires that you
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# specify it in Cargo.toml or via the matching environment variable.
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# Passing extra options to the linker is possible with Cargo via
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# RUSTFLAGS='-C link-args', but testing showed that doing this reliably
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# was difficult.
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#
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# Our solution to these problems is to use this wrapper script. We pass
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# in the LD and the LDFLAGS to use via environment variables. Note that
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# we do *not* quote either MOZ_CARGO_WRAP variable:
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#
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# * MOZ_CARGO_WRAP_LD is equivalent to CC on Unix-y platforms, and CC
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# frequently has additional arguments in addition to the compiler
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# itself.
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# * MOZ_CARGO_WRAP_LDFLAGS contains space-separated arguments to pass,
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# and not quoting it ensures that either of those arguments is passed
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# as a separate argument to the actual LD.
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${MOZ_CARGO_WRAP_LD} ${MOZ_CARGO_WRAP_LDFLAGS} "$@"
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