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This is no longer necessary with upstream rust-lang/rust changes as well
as some local tweaks. Namely:
* The `-fsanitize=address`-style options are now passed via `-C
link-args` through `RUSTFLAGS`. This obviates the need for the shell
script.
* The `-C default-linker-libraries`, disabling `-nodefaultlibs`, is
passed through `RUSTFLAGS`, which is necessary to ensure that
`-fsanitize=address` links correctly.
* The `-C linker` option is passed to ensure we're using the same C
compiler as normal C code, although it has a bit of hackery to only
get the `gcc` out of `gcc -std=c99`
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Hello71 spotted this first.
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We need this trick because some of our Rust tests depend on our C
code, which in turn depend on other native libraries, which thereby
pulls a whole mess of our build system into "cargo test".
To solve this, we add a build script (build.rs) to set most of the
options that we want based on the contents of config.rust. Some
options can't be set, and need to go to the linker directly: we use
a linker replacement (link_rust.sh) for these. Both config.rust and
link_rust.sh are generated by autoconf for us.
This patch on its own should enough to make the crypto test build,
but not necessarily enough to make it pass.
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