build.rs: Disable LTO if enabled implictly #2289
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LTO between Rust and C is complicated. It requires clang and specific invocations configurations for both Rust and C compilations. If the CFLAGS from the environment enable LTO, for example from distribution build tools this can lead to errors. Instead always disable LTO for the C compilation. There is not much to optimize away anyways. Closes briansmith#1444
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How would the user enable LTO, with this patch? |
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LTO between Rust and C is complicated. It requires clang and specific invocations configurations for both Rust and C compilations. If the CFLAGS from the environment enable LTO, for example from distribution build tools this can lead to errors.
Instead always disable LTO for the C compilation. There is not much to optimize away anyways.
Closes #1444