Continue to support binutils ar #736
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sfackler [observed] that the `binutils` package [provides] binaries named `$target-ar` (with no `-gcc`). This patch augments the change made in rust-lang#735 to continue picking those up too. [observed]: alexcrichton/openssl-src-rs#163 (comment) [provides]: https://packages.debian.org/bullseye/amd64/binutils-aarch64-linux-gnu/filelist
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cc @sfackler |
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What is the rationale for this change? I think it's generally expected you have a cross binutils in addition to a cross gcc if you are cross compiling. Binutils is a dependency of gcc in Ubuntu for example. |
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I came across this when I was in an environment where only |
jonhoo
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A second try at alexcrichton#163. The GCC convention is that if the toolchain is named `$target-gnu-gcc`, then ranlib and ar will be available as `$target-gnu-gcc-ranlib` and `$target-gnu-gcc-ar` respectively. The code as written would infer them to be `$target-gnu-{ranlib,ar}`, which will only work if the tools from `binutils` (which follow that convention) are on `$PATH`. I've also updated the logic in line with the `cc` crate to check that the inferred `AR`/`RANLIB` is actually executable before setting it as an override. See also rust-lang/cc-rs#736.
This was referenced Oct 26, 2022
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This should be pretty harmless, and avoid anything bad that would be caused by #735. I have seen the |
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As observed in cross-rs/cross#1100, in some situations `*-gcc-ar` might actually be just broken. I believe this is most likely just a plain bug in gcc (failing to consider `--disable-lto` configuration option somewhere in their build setup,) but for the time being `*-ar` tends to avoid this problem altogether. Code added in rust-lang#736 appears to be preferring `*-gcc-ar`, but no strong rationale is given to prefer one over the other. `*-gcc-ar` being outright broken sometimes seems like a rationale strong enough to continue preferring binutils’ `ar`.
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As observed in cross-rs/cross#1100, in some situations `*-gcc-ar` might actually be just broken. I believe this is most likely just a plain bug in gcc (failing to consider `--disable-lto` configuration option somewhere in their build setup,) but for the time being `*-ar` tends to avoid this problem altogether. Code added in #736 appears to be preferring `*-gcc-ar`, but no strong rationale is given to prefer one over the other. `*-gcc-ar` being outright broken sometimes seems like a rationale strong enough to continue preferring binutils’ `ar`.
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sfackler observed that the
binutilspackage provides binaries named$target-ar(with no-gcc). This patch augments the change made in #735 to continue picking those up too.