buildRustCrate: Make CARGO_MANIFEST_DIR absolute
While it is not obvious from the source, cargo sets CARGO_MANIFEST_DIR to an absolute directory. This let to a build problem with the popular "tera" crate using the "pest" crate. ## Cargo details The variable is set here:f7c91ba622/src/cargo/core/compiler/compilation.rs (L229)
and computed from the `manifest_path`:f7c91ba622/src/cargo/core/package.rs (L163)
The manifest path is also exported via `cargo metadata` where you can see that it is absolute.
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@ -81,7 +81,7 @@ in ''
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export CARGO_CFG_TARGET_POINTER_WIDTH=${toString stdenv.hostPlatform.parsed.cpu.bits}
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export CARGO_CFG_TARGET_VENDOR=${stdenv.hostPlatform.parsed.vendor.name}
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export CARGO_MANIFEST_DIR="."
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export CARGO_MANIFEST_DIR=$(pwd)
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export DEBUG="${toString (!release)}"
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export OPT_LEVEL="${toString optLevel}"
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export TARGET="${stdenv.hostPlatform.config}"
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