Replace dangerous cargo features with rustc flags #263
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This feature was not useful for Cargo users, since Cargo does not give you the kind of fine-grained control over C library linkage that you need. So it was just unnecessarily confusing and would cause the build to break if you enabled it accidentally, say, with --all-features.
It's super dangerous to use Cargo features for this, since they can be set accidentally (or maliciously by any crate in a user's entire dep tree). Instead we can just require users set `RUSTFLAGS` appropriately, which we can easily do in our fuzzing scripts.
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external-symbols feature
elichai
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| if cfg!(feature = "external-symbols") { | ||
| println!("cargo:rustc-link-lib=static=secp256k1"); | ||
| return; | ||
| } | ||
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We don't want to leave if cfg!("rust_secp_no_symbol_renaming") here?
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No, all this does is set a flag that Cargo understands ... but if you are using Cargo then you shouldn't be using this flag, since you'll get symbol collisions and other messy results.
elichai
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Dec 22, 2020
This was referenced Jan 11, 2021
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cc @TheBlueMatt
For Core integration you now need to add
--cfg=rust_secp_no_symbol_renamingto your rustc flags rather than--cfg=features=external-symbols.For fuzzing you need to add
--cfg=rust_secp_fuzzrather than--cfg=features=fuzztarget. Our downstream fuzzing scripts will need to be adjusted.